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Diagnostic Trouble Code Definitions

WARNING: This page is about a different car, the 2001 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Front radio control unit may also be referred to as Audio Control Module (ACM). Speed control servo may also be referred to as Next Generation Speed Control (NGSC) servo. Air Suspension/Electronic Variable Orifice (EVO) steering module may also be referred to as Rear Air Suspension Module (RASM). Instrument cluster may also be referred to as Hybrid Electronic Cluster (HEC).
NOTE: For Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) identification and repair, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
AIR SUSPENSION/ELECTRONIC VARIABLE ORIFICE STEERING MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC Description Perform Test
B1317 Battery Voltage High (1)
B1318 Battery Voltage Low (1)
B1342 Electronic Control Unit Defective (2)
C1441 Steering Sensor Channel A Circuit Failure (3)
C1442 Steering Sensor Channel B Circuit Failure (3)
C1722 Air Suspension Height Sensor Power Circuit Short To Voltage (1)
C1723 Air Suspension Height Sensor Power Circuit Short To Ground (1)
C1760 Air Suspension Rear Height Sensor High Signal Circuit Failure (1)
C1763 Air Suspension Rear Height Sensor High Signal Circuit Short To Ground (1)
C1765 Air Suspension Rear Height Sensor Low Signal Circuit Failure (1)
C1768 Air Suspension Rear Height Sensor Low Signal Circuit Short To Ground (1)
C1770 Air Suspension Vent Solenoid Output Circuit Failure (1)
C1773 Air Suspension Vent Solenoid Output Circuit Short To Ground (1)
C1790 Air Suspension Left Rear Air Spring Solenoid Output Circuit Failure (1)
C1793 Air Suspension Left Rear Air Spring Solenoid Output Circuit Short To Ground (1)
C1795 Air Suspension Right Rear Air Spring Solenoid Output Circuit Failure (1)
C1798 Air Suspension Right Rear Air Spring Solenoid Output Circuit Short To Ground (1)
C1813 Air Suspension Vent Request Exceeded Maximum Time (1)
C1818 Air Suspension Air Compressor Request Exceeded Maximum Time (1)
C1830 Air Compressor Relay Circuit Failure (1)
C1832 Air Compressor Relay Circuit Short To Voltage (1)
C1840 Air Suspension Switch Circuit Failure (1)
C1842 Air Suspension Switch Circuit Short To Voltage (1)
C1897 Steering VAPS Circuit Loop Failure (3)
U1041 Standard Corporate Protocol Invalid/Missing Data For Vehicle Speed (4)
(1) Repair electronic suspension concern. See appropriate ELECTRONIC article in SUSPENSION.
(2) Using New Generation Star tester, retrieve and document all continuous DTCs. Perform air suspension/electronic variable orifice steering module self-test. If DTC B1342 is retrieved again, replace air suspension/electronic variable orifice steering module.
(3) Repair electronic steering concern. See appropriate ELECTRONIC article in STEERING.
(4) Caused by Anti-Lock Brake System (ABS) module. Using NGS tester, perform ABS module self-test and repair ABS concern. See appropriate ANTI-LOCK article in BRAKES.
ANTI-LOCK BRAKE SYSTEM MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC Description Perform Test
B1342 Electronic Control Unit Defective (1)
B1484 Brake Pedal Input Open Circuit (2)
B1676 Battery Voltage Out Of Range (2)
C1145 Right Front Anti-Lock Brake System Sensor Input Circuit Failure (2)
C1155 Left Front Anti-Lock Brake System Sensor Input Circuit Failure (2)
C1165 Right Rear Anti-Lock Brake System Sensor Input Circuit Failure (2)
C1175 Left Rear Anti-Lock Brake System Sensor Input Circuit Failure (2)
C1222 Mismatched Wheels Or Damaged Tone Ring (3)
C1266 Anti-Lock Brake System Valve Power Relay Circuit Failure (4)
C1296 Left Front Anti-Lock Brake System Sensor Input Signal Missing (2)
C1297 Right Front Anti-Lock Brake System Sensor Input Signal Missing (2)
C1298 Right Rear Anti-Lock Brake System Sensor Input Signal Missing (2)
C1299 Left Rear Anti-Lock Brake System Sensor Input Signal Missing (2)
C1300 Anti-Lock Brake System Pump Motor Circuit Failure (2)
C1805 Powertrain Control Module & Anti-Lock Brake System Modules Do Not Match (5)
U1009 Standard Corporate Protocol Invalid/Missing Data For Engine Torque (6)
U1040 Standard Corporate Protocol Invalid/Missing Data For Vehicle Speed (7)
U1041 Standard Corporate Protocol Invalid/Missing Data For Vehicle Speed (7)
U1262 Standard Corporate Protocol Invalid/Missing Data For Traction Control (8)
(1) Using new generation star tester, retrieve and document all continuous DTCs. Perform Anti-Lock Brake System (ABS) module self-test. If DTC B1342 is retrieved again, replace ABS module.
(2) Repair anti-lock brake system concern. See appropriate ANTI-LOCK article in BRAKES.
(3) Ensure tires are the same size and are correctly inflated. Check condition of tone rings. Repair or replace as necessary.
(4) Using new generation star tester, retrieve and document all continuous DTCs. Perform anti-lock brake system self-test. If DTC C1266 is retrieved again, replace hydraulic control unit.
(5) Verify part numbers to be correct. Install correct module.
(6) Caused by Powertrain Control Module (PCM). Using new generation star tester, perform PCM self-test and repair PCM concern. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
(7) Using new generation star tester, retrieve and document all continuous DTCs. Perform Anti-Lock Brake System (ABS) module self-test. If DTC U1041 is retrieved again, replace ABS module.
(8) Caused by instrument cluster control module. Using new generation star tester, perform instrument cluster module self-test and repair instrument cluster concern. See appropriate ANALOG INSTRUMENT PANELS article.
DRIVER'S DOOR MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC Description Perform Test
B1322 Driver's Door Ajar Circuit Failure (1)
B1342 Electronic Control Unit Defective (2)
B1396 Power Door Lock Circuit Short To Voltage (1)
B1397 Power Door Unlock Circuit Short To Voltage (1)
B1402 Driver's Door Window Switch Down Circuit Failure (3)
B1445 Door Handle Circuit Short To Ground (4)
B1526 Keyless Entry Short To Power (3)
B1529 Memory Set Switch Circuit Short To Voltage (5)
B1533 Memory "1" Switch Circuit Short To Voltage (5)
B1537 Memory "2" Switch Short To Voltage (5)
B1545 Power Seat Switch Short To Voltage (6)
B1549 Power Window Switch Short To Voltage (3)
B1553 Trunk Release Switch Circuit Short To Voltage (1)
B1566 Left Front, Right Front, Left Rear & Right Rear Door Ajar Circuits Short To Ground (1)
B2338 Mirror Switch Assembly Circuit Short To Ground (5)
B2368 Memory LED Output Short To Voltage (5)
B2373 LED "1" Circuit Short To Voltage (5)
B2425 Remote Keyless Entry Out Of Synchronization (1)
C1920 LED "1" Circuit Failure (5)
U1041 Standard Corporate Protocol Invalid/Missing Data For Vehicle Speed (7)
U1059 Standard Corporate Protocol Invalid/Missing Data For Transmission Range (PRNDL) (8)
U1180 Standard Corporate Protocol Invalid/Missing Data For Personalization Memory Features (9)
U1135 Standard Corporate Protocol Invalid/Missing Data For Ignition Switch (10)
U1180 Standard Corporate Protocol Invalid/Missing Data For Personalization (Memory) Features (11)
U1181 Standard Corporate Protocol Invalid/Missing Data For Personalization (Memory) Features (11)
U1194 Standard Corporate Protocol Invalid/Missing Data For Mirrors

(11)
U1197 Standard Corporate Protocol Invalid/Missing Data For Door Locks (11)
U1199 Standard Corporate Protocol Invalid/Missing Data For External Access (Doors) (11)
U1200 Standard Corporate Protocol Invalid/Missing Data For Seat Motion/Control (6)
U1222 Standard Corporate Protocol Invalid/Missing Data For Interior Lights (12)
U1262 Standard Corporate Protocol Bus Communication Fault (13)
(1) For testing procedure, see POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS - TOWN CAR article.
(2) Using new generation star tester, retrieve and document all continuous DTCs. Perform Driver's Door Module (DDM) self-test. If DTC B1342 is retrieved again, replace DDM.
(3) For testing procedure, see POWER WINDOWS - TOWN CAR article.
(4) Using new generation star tester, retrieve and document all continuous DTCs. Perform Driver's Door Module (DDM) self-test. If DTC B1445 is retrieved again, replace DDM.
(5) For testing procedure, see POWER MIRRORS - TOWN CAR article.
(6) For testing procedure, see POWER SEATS - TOWN CAR article.
(7) Caused by Anti-Lock Brake System (ABS) module. Using new generation star tester, perform ABS system self-test and repair ABS concern. See appropriate ANTI-LOCK article in BRAKES.
(8) Caused by Powertrain Control Module (PCM). Using new generation star tester, perform PCM self-test and repair PCM concern. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
(9) Using new generation star tester, retrieve and document all continuous DTCs. Perform Drivers Door Module (DDM) self-test. If DTC U1200 is retrieved again, replace DDM.
(10) Caused by Lighting Control Module (LCM). Using new generation star tester, perform LCM self-test and repair steering column switch concern. See STEERING COLUMN SWITCHES - TOWN CAR article.
(11) Caused by Driver's Door Module (DDM). Using new generation star tester, perform DDM self-test.
(12) Caused by Lighting Control Module (LCM). Using new generation star tester, perform LCM self-test.
(13) Service all other DTCs first. After all other DTC concerns have been repaired, perform TEST M: NO MODULE/NETWORK COMMUNICATION - SCP BUS LINK .
DRIVER'S SEAT MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC Description Perform Test
B1342 Electronic Control Unit Defective (1)
B1663 Driver's Seat Front Up/Down Circuit Failure (2)
B1664 Driver's Seat Rear Up/Down Circuit Failure (2)
B1665 Driver's Seat Forward/Backward Circuit Failure (2)
B1666 Driver's Seat Recline Circuit Failure (2)
B1667 Driver's Mirror Up/Down Circuit Failure (3)
B1668 Driver's Mirror Right/Left Circuit Failure (3)
B1669 Passenger's Mirror Up/Down Circuit Failure (3)
B1670 Passenger's Mirror Right/Left Circuit Failure (3)
B1676 Battery Voltage Out Of Range (2)
B1950 Driver's Seat Rear Up/Down Potentiometer Circuit Failure (2)
B1953 Driver's Seat Rear Up/Down Potentiometer Short To Ground (2)
B1954 Driver's Seat Front Up/Down Potentiometer Circuit Failure (2)
B1957 Driver's Seat Front Up/Down Potentiometer Short To Ground (2)
B1958 Driver's Seat Recline Potentiometer Circuit Failure (2)
B1961 Driver's Seat Recline Potentiometer Short To Ground (2)
B1962 Driver's Seat Horizontal Potentiometer Circuit Failure (2)
B1965 Driver's Seat Horizontal Potentiometer Short To Ground (2)
B1987 Adjustable Pedal Assembly Forward/Rearward Motor Stalled (4)
B1988 Adjustable Pedal Assembly Forward Switch Short To Power (4)
B1989 Adjustable Pedal Assembly Rearward Switch Short To Power (4)
B1990 Adjustable Pedal Assembly Forward/Rearward Potentiometer Feedback Circuit Failure (4)
B2275 Adjustable Pedal Assembly Forward/Rearward Potentiometer Feedback Circuit Short To Ground (4)
B2312 Passenger's Mirror Right/Left Potentiometer Circuit Failure (3)
B2315 Passenger's Mirror Right/Left Potentiometer Short To Ground (3)
B2316 Passenger's Mirror Up/Down Potentiometer Circuit Failure (3)
B2319 Passenger's Mirror Up/Down Potentiometer Short To Ground (3)
B2320 Driver's Mirror Right/Left Potentiometer Circuit Failure (3)
B2323 Driver's Mirror Right/Left Potentiometer Short To Ground (3)
B2324 Driver's Mirror Up/Down Potentiometer Circuit Failure (3)
B2327 Driver's Mirror Up/Down Potentiometer Short To Ground (3)
U1059 Standard Corporate Protocol Invalid/Missing Data For Transmission Range (PRNDL) (5)
U1135 Standard Corporate Protocol Invalid/Missing Data For Ignition Switch (6)
U1180 Standard Corporate Protocol Invalid/Missing Data For Memory Feature (7)
U1181 Standard Corporate Protocol Invalid/Missing Data For Memory Feature (7)
U1194 Standard Corporate Protocol Invalid/Missing Data For Mirrors (7)
U1200 Standard Corporate Protocol Invalid/Missing Data For Seat Motion/Control (8)
U1262 Standard Corporate Protocol Bus Communication Fault (9)
(1) Using new generation star tester, retrieve and document all continuous DTCs. Perform Driver's Seat Module (DSM) self-test. If DTC B1342 is retrieved again, replace DSM.
(2) For testing procedure, see POWER SEATS - TOWN CAR article.
(3) For testing procedure, see in POWER MIRRORS - TOWN CAR article.
(4) Repair adjustable pedal assembly concern. See ADJUSTABLE PEDAL ASSEMBLY SYSTEMS article.
(5) Caused by Powertrain Control Module (PCM). Using new generation star tester, perform PCM self-test and repair PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
(6) Caused by Lighting Control Module (LCM). Using new generation star tester, perform LCM self-test and repair steering column switch concern. See STEERING COLUMN SWITCHES - TOWN CAR article.
(7) Caused by Driver's Door Module (DDM). Using new generation star tester, perform DDM self-test and repair power mirror system concern. See POWER MIRRORS - TOWN CAR article.
(8) Caused by Driver's Door Module (DDM). Using new generation star tester, perform DDM self-test and repair power seat system concern. See POWER SEATS - TOWN CAR article.
(9) Service all other DTCs first. After all other DTC concerns have been repaired, perform TEST M: NO MODULE/NETWORK COMMUNICATION - SCP BUS LINK .
ELECTRONIC AUTOMATIC TEMPERATURE CONTROL MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC Description Perform Test
B1249 Blend Door Short (1)
B1251 A/C In-Car Temperature Sensor Open Circuit (1)
B1253 A/C In-Car Temperature Sensor Short To Ground (1)
B1255 A/C Ambient Temperature Sensor Open Circuit (1)
B1257 A/C Ambient Temperature Sensor Short To Ground (1)
B1261 A/C Solar Radiation Sensor Circuit Short To Ground (1)
B2416 Recirculated Air Door Circuit Failure (1)
U1041 Standard Corporate Protocol Invalid/Missing Data For Vehicle Speed (2)
U1073 Standard Corporate Protocol Invalid/Missing Data For Engine Coolant (2)
U1222 Standard Corporate Protocol Invalid/Missing Data For Interior Lights (3)
U1235 Standard Corporate Protocol Invalid/Missing Data For Displays (4)
(1) Repair climate control concern. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
(2) Caused by Powertrain Control Module (PCM). Using new generation star tester, perform PCM self-test and repair PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
(3) Caused by Lighting Control Module (LCM). Using new generation star tester, perform LCM self-test and repair interior lighting concern. See AUTOLAMP SYSTEMS - TOWN CAR article.
(4) Caused by instrument cluster module. Using new generation star tester, perform instrument cluster self-test and repair instrument cluster concern. See ANALOG INSTRUMENT PANELS - TOWN CAR article.
FRONT RADIO CONTROL UNIT DIAGNOSTIC TROUBLE CODE INDEX

DTC Description Perform Test
B1342 Electronic Control Module Defective (1)
B2401 Audio Tape Deck Mechanical Fault (2)
B2402 Audio CD/DJ Thermal Shutdown (3)
B2403 Audio CD/DJ Internal Fault (3)
B2404 Audio Steering Wheel Switch Circuit Failure (3)
B2405 Audio Single-Disc CD Player Thermal Shutdown Fault (3)
B2406 Audio Single-Disc CD Player Internal Fault (3)
U1041 Standard Corporate Protocol Invalid/Missing Data For Vehicle Speed (4)
U2003 Audio CD/DJ Is Not Responding (3)
U2005 Audio Rear Integrated Control Panel Unit Is Not Responding (5)
U2008 Audio Phone Is Not Responding (6)
U2014 Audio Subwoofer Unit Is Not Responding (3)
(1) Using new generation star tester, retrieve and document all continuous DTCs. Perform front radio control unit self-test. If DTC B1342 is retrieved again, replace front radio control unit.
(2) Remove audio tape. Using new generation star tester, clear DTCs. Perform front radio control unit self-test. If B2401 is retrieved, repair or replace front radio control unit.
(3) Repair audio system concern.
(4) Caused by Anti-Lock Brake System (ABS) module. Using new generation star tester, perform ABS module self-test and repair ABS concern. See appropriate ANTI-LOCK article in BRAKES.
(5) This DTC is retrieved if vehicle is not equipped with Rear Audio Control Panel or rear audio control panel is disconnected or inoperative.
(6) Repair cellular phone system concern.
INSTRUMENT CLUSTER DIAGNOSTIC TROUBLE CODE INDEX

DTC Description Perform Test
B1201 Fuel Sender Circuit Failure (1)
B1204 Fuel Sender Short To Ground (1)
B1205 Instrument Cluster Switch 1 Assembly Circuit Failure (Open Or Short To Voltage) (1)
B1208 Instrument Cluster Switch 1 Assembly Circuit Short To Ground (1)
B1213 Number Of Programmed Ignition Keys Below Minimum (2)(3)
B1232/2103 Antenna Not Connected/Defective Transceiver (3)
B1317 Battery Voltage High (Greater Than 19 Volts) (4)
B1318 Battery Voltage Low (Less Than 9 Volts) (4)
B1342 Electronic Control Unit Defective (5)
B1600 Passive-Anti Theft System Ignition Key Transponder Signal Not Received (Damaged Key Or Non-Passive-Anti Theft System Key) (3)
B1601 Passive-Anti Theft System Received Incorrect Key-Code From Ignition Key Transponder (3)
B1602 Passive-Anti Theft System Received Invalid Key Code Format From Transponder (3)
B1681 Passive-Anti Theft System Transceiver Signal Is Not Received (3)
B2139 Passive-Anti Theft System Data Mismatch (3)
B2141 NVM Configuration Failure (3)
B2143 NVM Memory Failure (1)
U1147 Invalid/Missing Data For Vehicle Security (3)
P0457 Fuel Fill Cap Off (1)
U1262 Standard Corporate Protocol Bus Communication Fault (6)
U2013 No Response From Compass Module (7)
(1) For testing procedure, see ANALOG INSTRUMENT PANELS - TOWN CAR article.
(2) If DTCs B1232, B1600, B1601, B1602 or B1681 are also present, service these DTCs first then recheck codes.
(3) For testing procedure, see PASSIVE ANTI-THEFT SYSTEMS - TOWN CAR article.
(4) Check charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If charging system is okay, check power and ground circuits to instrument cluster. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
(5) Using new generation star tester, retrieve and record all continuous DTCs. Perform instrument cluster self-test. If DTC B1342 still exists, replace instrument cluster.
(6) Service all other DTCs first. After all other DTC concerns have been repaired, perform TEST M: NO MODULE/NETWORK COMMUNICATION - SCP BUS LINK .
(7) Repair compass module circuits and/or replace compass module as necessary. See WIRING DIAGRAMS in INSTRUMENT PANELS - TOWN CAR article.
LIGHTING CONTROL MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC Description Perform Test
B1312 Headlight Input Short To Battery Voltage (1)
B1334 Trunk Lid Ajar Rear Door Circuit Short To Ground (2)
B1340 Electronic Crash Sensor Tone Request Short To Ground (3)
B1342 Electronic Control Unit Defective (4)
B1352 Ignition Key-In Circuit Failure (5)
B1359 Ignition RUN/ACC Input Circuit Failure (6)
B1446 Wiper PARK Sense Circuit Failure (7)
B1485 Brake Pedal Input Circuit Short To Voltage (1)
B1555 Ignition RUN/START Circuit Failure (6)
B1569 High Beam Short To Battery Voltage (1)
B1577 Parking Lamp Input Short To Voltage (1)
B1581 Panel Dim Increase Input Circuit Short To Voltage (5)
B1585 Panel Dim Decrease Input Short To Voltage (5)
B1676 Battery Voltage Out Of Range (8)
B1687 Dome Light Input Short To Voltage (1)
B1689 Autolamp Delay Input Circuit Failure (1)
B1691 Autolamp Delay Input Circuit Short To Voltage (1)
B1695 Autolamp ON/OFF Short To Voltage (1)
B1873 Turn Signal/Hazard Power Feed Short To Ground (1)
U1041 Standard Corporate Protocol Invalid/Missing Data For Vehicle Speed (9)
U1051 Standard Corporate Protocol Invalid/Missing Data For Brakes (10)
U1059 Standard Corporate Protocol Invalid/Missing Data For Transmission Range (PRNDL) (11)
U1135 Standard Corporate Protocol Invalid/Missing Data For Ignition Switch/Starter (6)
U1197 Standard Corporate Protocol Invalid/Missing Data For Door Locks (12)
U1199 Standard Corporate Protocol Invalid/Missing Data For External Access (Doors) (12)
U1222 Standard Corporate Protocol Invalid/Missing Data For Interior Lamps (10)
U1262 Standard Corporate Protocol Bus Communication Fault (13)
(1) For testing procedure, see AUTOLAMP SYSTEMS - TOWN CAR article.
(2) For testing procedure, see POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS - TOWN CAR article.
(3) Repair short to ground in electronic crash sensor circuit. For information on supplemental restraint system DIAGNOSIS & TESTING, see lemon-25® AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS.
(4) Using new generation star tester, retrieve and document all continuous DTCs. Perform Lighting Control Module (LCM) self-test. If DTC B1342 is retrieved again, replace LCM.
(5) For testing procedure, see ANALOG INSTRUMENT PANELS - TOWN CAR article.
(6) For testing procedure, see STEERING COLUMN SWITCHES - TOWN CAR article.
(7) For testing procedure, see WIPER/WASHER SYSTEMS - TOWN CAR article.
(8) Check charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If charging system is okay, check power and ground circuits to lighting control module. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
(9) Caused by Anti-Lock Brake System (ABS) module. Using new generation star tester, perform ABS self-test and repair ABS concern. See appropriate ANTI-LOCK article in BRAKES.
(10) Using new generation star tester, retrieve and document all continuous DTCs. Perform lighting control module self-test.
(11) Caused by Powertrain Control Module (ABS). Using new generation star tester, perform PCM self-test and repair PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
(12) Caused by Driver's Door Module (DDM). Using new generation star tester, perform DDM self-test.
(13) Service all other DTCs first. After all other DTC concerns have been repaired, perform TEST M: NO MODULE/NETWORK COMMUNICATION - SCP BUS LINK .
RESTRAINT CONTROL MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC (1) and (6) Description Perform Test
B1869 Air Bag Indicator Inoperative/Open Circuit (2)
B1870 Air Bag Indicator Shorted To Voltage (2)
B1317 Battery Voltage High (3)
B1318 Battery Voltage Low (3)
B1342 Electronic Control Module Defective (4)
B1231 Longitudinal Acceleration Threshold Exceeded (5)
B1921 Air Bag Diagnostic Monitor Ground Circuit Open (2)
B2290 Occupant Classification System Fault (2)
C1414 Incorrect Vehicle Identification Code (2)
B2296 Restraint System - Impact Sensor Status (2)
B2432 Driver Seat Belt Buckle Switch Circuit Open (2)
B2433 Driver Seat Belt Buckle Switch Circuit Short To Battery (2)
B2434 Driver Seat Belt Buckle Switch Circuit Short To Ground (2)
B2435 Driver Seat Belt Buckle Resistance Out Of Range (2)
B2436 Passenger Seat Belt Buckle Switch Circuit Open (2)
B2437 Passenger Seat Belt Buckle Switch Circuit Short To Battery (2)
B2438 Passenger Seat Belt Buckle Switch Circuit Short To Ground (2)
B2439 Passenger Seat Belt Buckle Resistance Out Of Range (2)
B2293 Restraint System - Airbag Status (2)
B2292 Restraint System - Seatbelt Pretensioner Status (2)
B2295 Restraint System - Side Airbag Status (2)
C1946 Seat Track Position Switch Circuit Open (2)
C1947 Seat Track Position Switch Short To Ground (2)
C1948 Seat Track Position Switch Resistance Out Of Range (2)
C1982 Seat Track Position Switch Short To Power (2)
B1884 PAD Warning Light Inoperative (2)
B1890 PAD Warning Light Circuit Shorted To Voltage (2)
B1891 Air Bag Tone Warning Indicator Circuit Shorted To Voltage (2)
B1892 Air Bag Tone Warning Indicator Circuit Failure (2)
B2477 Module Configuration Failure (5)
(1) DTCs are listed in order of importance. Repair DTCs in order listed.
(2) Repair supplemental restraint system concern. For information on supplemental restraint system DIAGNOSIS & TESTING, see lemon-25® AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS.
(3) For testing procedure, see GENERATORS & REGULATORS - TOWN CAR article.
(4) Using new generation star tester, retrieve and document all continuous DTCs. Perform Restraint Control Module (RCM) self-test. If DTC B1342 is retrieved again, replace RCM.
(5) Clear DTCs and retest system for normal operation.
(6) Service all other DTCs first. After all other DTC concerns have been repaired, perform TEST M: NO MODULE/NETWORK COMMUNICATION - SCP BUS LINK .
SPEED CONTROL SERVO DIAGNOSTIC TROUBLE CODE INDEX

DTC Description Perform Test
B1318 Battery Voltage Low (1)
B1342 Electronic Control Module Defective (2)
C1109 Throttle Position Did Not Return To Idle After Self-Test (1)
C1126 Speed Control Switch Stuck For 2 Minutes Or Longer (1)
C1127 Deactivator Switch Circuit Failure (1)
C1179 Speed Control Cable Slack Failure (1)
U1027 Standard Corporate Protocol Invalid/Missing Data For Engine RPM (3)
U1041 Standard Corporate Protocol Invalid/Missing Data For Vehicle Speed (4)
U1051 Standard Corporate Protocol Invalid/Missing Data For Brakes (5)
U1059 Standard Corporate Protocol Invalid/Missing Data For Transmission Range (PRNDL) (3)
(1) For testing procedure, see CRUISE CONTROL SYSTEMS - TOWN CAR article.
(2) Using new generation star tester, retrieve and document all continuous DTCs. Perform air suspension/electronic variable orifice steering module self-test. If DTC B1342 is retrieved again, replace air suspension/electronic variable orifice steering module.
(3) Caused by Powertrain Control Module (PCM). Using new generation star tester, perform PCM self-test and repair PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
(4) Caused by Anti-Lock Brake System (ABS) module. Using new generation star tester, perform ABS self-test and repair ABS concern. See appropriate ANTI-LOCK article in BRAKES.
(5) Caused by Lighting Control Module (LCM). Using new generation star tester, perform LCM self-test. See AUTOLAMP SYSTEMS - TOWN CAR article.
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