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Engine Controls - Tests W/Codes - 6.5L Diesel Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Diagnostic Trouble Code Charts Notes On-Board Diagnostic (OBD) System Check (Models With Pcm) Chart A-1, No Mil (Service Engine Soon Light) (Models W/ Pcm) Chart A-2, No Scan Data, Mil (Service Engine Soon) On At All Times Or Will Not Flash Mil (Models With Pcm) Chart A-3, Engine Cranks But Will Not Run EGR Control Pressure/BARO Sensor Output Check DTC 13, Engine Shutoff Solenoid Circuit Fault DTC 14, ECT Sensor Circuit Low (High Temperature Indicated) DTC 15, ECT Sensor Circuit High (Low Temperature Indicated) DTC 16, Vehicle Speed Signal Buffer Fault DTC 17, High Resolution Circuit Fault DTC 18, Pump Cam Reference Pulse Error DTC 19, Crankshaft Position Reference Error DTC 21, App No. 1 Circuit High (Models With Pcm) DTC 22, App No. 1 Circuit Low (Models With Pcm) DTC 23, App No. 1 Circuit Range Fault DTC 24, VSS Circuit Low (Transmission Output Speed Signal) DTC 25, Accelerator Pedal Position (App) No. 2 Circuit High DTC 26, Accelerator Pedal Position (App) No. 2 Circuit Low DTC 27, App No. 2 Circuit Range Fault DTC 28, Transmission Range Pressure Switch Circuit Fault Transmission Range Pressure Switch Combinations DTC 29, Glow Plug Relay Circuit Fault DTC 31, EGR Control Pressure/BARO Sensor CKT Low (High Vac) DTC 32, EGR Circuit Error DTC 33, EGR Control Pressure/BARO Sensor CKT High (Low Vac) DTC 34, Injection Timing Stepper (Its) Motor Circuit Fault DTC 35, Injection Pulse Width Error (Response Time Short) DTC 36, Injection Pulse Width Error (Response Time Long) DTCS 37/38, TCC Brake Switch Stuck On/Off DTC 39, TCC Stuck Off (4L80-E) DTC 41, Brake Switch Circuit Fault DTC 42, Fuel Temp Circuit Low (High Temp Indicated) DTC 43, Fuel Temp Circuit High (Low Temp Indicated) DTC 44, EGR Pulse Width Error DTC 45, EGR Vent Error DTC 46, Malfunction Indicator Light (Mil) Circuit Fault DTC 47, IAT Sensor Circuit Low (High Temperature Indicated) DTC 48, IAT Sensor Circuit High (Low Temperature Indicated) DTC 49, Service Throttle Soon Light Circuit Fault DTC 51, Prom Problem (Faulty Or Incorrect Prom) DTCS 52/53, System Voltage High Long DTC 54, Pcm Fuel Circuit Error DTC 56, Injection Pump Calibration Resistor Error DTC 57, Pcm 5-Volt Shorted DTC 58, Transmission Fluid Temp Sensor Circuit Low (High Temp Indicated) - 4L60-E & 4L80-E DTC 59, Transmission Fluid Temp Sensor Circuit High (Low Temp Indicated) - 4L60-E & 4L80-E DTC 61, Turbo Boost Sensor Circuit High DTC 62, Turbo Boost Sensor Circuit Low DTC 63, App No. 3 Circuit High (Models With Pcm) DTC 64, App No. 3 Circuit Low (Models With Pcm) DTC 65, App No. 3 Circuit Range Fault DTC 66, 3-2 Control Solenoid Circuit Fault (4L60-E) DTC 67, TCC Solenoid Circuit Fault (4L60-E) DTC 68, Transmission Component Slipping (4L80-E) DTC 69, TCC Stuck On (4L60-E) DTC 69, TCC Stuck On (4L80-E) DTC 71, Set/Coast Switch Fault (Models With Pcm) DTC 72, Speed Sensor Circuit Loss (Trans Output Speed Signal) - 4L60-E & 4L80-E DTC 73, Pressure Control Solenoid Circuit (Current Error) DTC 74, Transmission Input Speed Sensor Circuit (4L80-E) DTC 75, System Voltage Low DTC 76, Resume/ACCEL Switch Fault DTC 78, WASTEGATE Solenoid Fault DTC 79, Transmission Fluid OVERTEMP - 4L60-E & 4L80-E DTC 81, 2-3 Shift Solenoid Circuit Fault - 4L60-E & 4L80-E DTC 82, 1-2 Shift Solenoid Circuit Fault - 4L60-E & 4L80-E DTC 83, TCC PWM Solenoid Circuit Fault - 4L60-E & 4L80-E DTC 84, Accelerator Pedal Position (App) Circuit Fault DTC 85, Undefined Ratio Error (4L80-E) DTC 86, Low Ratio Error (4L80-E) DTC 87, High Ratio Error (4L80-E) DTC 88, TDC Offset Error DTC'S 91-98, Cylinder Balance Fault DTC 99, App No. 2 (5-Volt Reference Fault) Wiring Diagrams