LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 1995 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.1L >> Self-Diagnostic System >> Trouble Code Definitions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Trouble Code Definitions

TROUBLE CODE DEFINITIONS

New Code No. Old Code No. Circuit
DTC P0101  DTC 34  Mass Air Flow (MAF) Sensor Circuit, MAP Sensor Signal Voltage Low
DTC P0112  DTC 23  IAT Sensor Circuit Low Temperature Indicated, IAT Sensor Signal Voltage High (Low Temp Indicated)
DTC P0113  DTC 25  IAT Sensor Circuit High Temperature, IAT Sensor Signal Voltage Low (High Temp Indicated)
DTC P0117  DTC 15  Coolant Temp. Sensor Low Temp Indicated, Coolant Temp Sensor Signal Voltage Low
DTC P0118  DTC 14  Coolant Temp. Sensor High Temp Indicated, Coolant Temp Sens Sgnl Vltge Low (Hi Temp Indicated)
DTC P0122  DTC 22  Throttle Position Sens Sgnl Vltge Low, Throttle Position Sensor Signal Voltage Low
DTC P0123  DTC 21  Throttle Position Sens Sgnl Vltge High, Throttle Position Sensor Signal Voltage High
DTC P0131  DTC 44  Heated O2 Sensor Low Sgnl Voltage (Lean), Lean Exhaust Indication
DTC P0132  DTC 45  Heated O2 Sensor High Sgnl Voltage (Rich), Rich Exhaust Indication
DTC P0134  DTC 13  Heated Oxygen Sensor Open Circuit, Open Oxygen Sensor Circuit
DTC P0321  17 Ignition Control 24X Signal Ckt Error
DTC P0325  43 Knock Sensor Error (Single Sensor)
DTC P0341  18 Camshaft Position Sensor Extra Cam Pulses
DTC P0342  41 Camshaft Position Sensor Ckt (Loss Of Cam Pulses)
DTCS P0501/P0502  DTC 24  VSS Circuit, Vehicle Speed Sensor
DTC P0703  38 TCC Brake Switch Input
DTC P0705  31 Transaxle Range Sw
DTC P0712  59 Transaxle Temp Sensor Low Temp Indicated
DTC P0713  58 Transaxle Temp Sensor High Temp Indicated
DTC P0740  39 Torque Converter Clutch
DTC P0755  36 Trans. Shift Solenoid "B"
DTC P1350  42 IC Circuit Open
DTC P1361  42 IC By-Pass Circuit
DTCS P1403/P1404/P1405  75/76/77 EGR Error
DTC P1530  69 A/C Refrigerant Pressure
DTC P1550  New Cruise Stepper Motor
DTC P1623  51 PROM Error
DTC P1630  16 System Voltage High/Low - 3.1L
DTC P1640  26/56 QDM "A" Circuit
DTC P1650  26/56 QDM "B" Circuit