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Home >> Cadillac >> 1995 >> DeVille Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.9L >> Self-Diagnostic System >> Displaying Trouble Codes

Displaying Trouble Codes

  1. Diagnostic trouble codes appear in ascending (3-digit) numerical order and are prefixed by "P" (PCM), "I" (IPC), "A" (ACP), "R" (SIR) or "T" (TCS). A final digit of either a "C" (current) or "H" (history)" will also be indicated on every code. Diagnostic trouble code level displays PCM codes first, followed by IPC, ACP, SIR or TCS (if so prompted).
  2. For complete list of available PCM diagnostic trouble codes, see PCM DIAGNOSTIC TROUBLE CODES table. If no codes are present for a system, a "NO X CODE" message (with X being system, i.e. "P", "I", etc.) will be displayed. If communication line to a component is not operating, a "NO X DATA" message will be displayed, indicating that IPC could not communicate with that system.
  3. To continue with system diagnostics, see SERVICE MODE OPERATION. To exit from SERVICE MODE and go back to normal vehicle operation, press AUTO or DEFOG button on CCP, or press RESET button on DIC.
PCM DIAGNOSTIC TROUBLE CODES

Code Test Condition
CODE P012 (1) No Distributor Reference Signal
CODE P013 (1)(5) Rear Oxygen Sensor Not Ready
CODE P014 (1) Shorted Engine Coolant Temperature (ECT) Sensor
CODE P015 (1) Open Engine Coolant Temperature (ECT) Sensor
CODE P016 (2) Generator Voltage Out Of Range
CODE P017 (1) Front Oxygen Sensor Not Ready
CODE P019 (2) Shorted Fuel Pump Circuit
CODE P020 (2) Open Fuel Pump Circuit
CODE P021 (1) Shorted Throttle Position (TP) Sensor
CODE P022 (1) Open Throttle Position (TP) Sensor
CODE P023 (1)(7) Ignition Control Circuit Problem
CODE P024 (1)(4)(6) Vehicle Speed Sensor (VSS) Circuit Problem
CODE P026 (1)(7) Shorted Throttle Position Switch Circuit
CODE P027 (1)(7) Open Throttle Position Switch Signal
CODE P030 (1) ISC RPM Out Of Range
CODE P031 (1) Shorted Manifold Absolute Pressure (MAP) Sensor
CODE P032 (1) Open Manifold Absolute Pressure (MAP) Sensor
CODE P034 (1) MAP Sensor Signal Too High
CODE P037 (1) Shorted Intake Air Temperature (IAT) Sensor
CODE P038 (1) Open Intake Air Temperature (IAT) Sensor
CODE P039 (1)(4) TCC Engagement Problem (1 Of 5)
CODE P039 (1) TCC Engagement Problem (2 Of 5)
CODE P039 (1) TCC Engagement Problem (3 Of 5)
CODE P039 (1) TCC Engagement Problem (4 Of 5)
CODE P039 (1) TCC Engagement Problem (5 Of 5)
CODE P040 (1) Power Steering Pressure Switch Open
CODE P041 (1) No CAM Sensor Signal
CODE P042 (1)(5) Front Oxygen Sensor Signal Lean
CODE P043 (1)(5) Front Oxygen Sensor Signal Rich
CODE P044 (1)(5) Rear Oxygen Sensor Signal Lean
CODE P045 (1)(5) Rear Oxygen Sensor Signal Rich
CODE P046 (1) Front-To-Rear Bank Fueling Difference
CODE P047 (1) PCM/IPC Data Problem
CODE P048 (1) EGR System Malfunction
CODE P051 (1) PROM Checksum Mismatch
CODE P052 (3) PCM Keep Alive Memory Reset
CODE P053 (3) Distributor Signal Interrupt
CODE P055 (3) Closed Throttle Angle Out Of Range
CODE P057 (2) Shorted Transaxle Temperature Sensor Circuit
CODE P058 (3) PASS-Key(R) Fuel Enable Problem
CODE P059 (2) Open Transaxle Temperature Sensor Circuit
CODE P060 (3)(6) Cruise Control With Transaxle Not In Drive
CODE P061 (3)(6) Cruise Control Vent Solenoid Circuit Problem
CODE P062 (3)(6) Cruise Control Vacuum Solenoid Circuit Problem
CODE P063 (3)(6) Vehicle Speed & Set Speed Difference
CODE P064 (3)(6) Vehicle Acceleration Too High
CODE P065 (3)(6) Cruise Control Servo Position Sensor Failure
CODE P066 (3)(6) Cruise Engine RPM Too High
CODE P067 (3)(6) Set/Coast Or Resume/Accel Input Shorted
CODE P068 (3)(6) Cruise Control Servo Position Out Of Range
CODE P070 (3) Intermittent Throttle Position (TP) Sensor
CODE P071 (3) Intermittent MAP Sensor
CODE P073 (3) Intermittent Engine Coolant Temperature Sensor
CODE P074 (3) Intermittent Intake Air Temperature (IAT) Sensor
CODE P075 (3) Vehicle Speed Sensor Signal Interrupt
CODE P080 (1) Fuel System Rich
CODE P085 (1) Idle Throttle Angle Too High
CODE P090 (2)(6) TCC Brake Switch Input Circuit Problem
CODE P091 (2)(6) Transaxle Range Switch Problem
CODE P092 (2) Heated Windshield Request Problem
CODE P096 (1) Torque Converter Overstress
CODE P097 (3) Park/Neutral-To-Drive/Reverse At High Throttle
CODE P098 (3) High Rpm Park/Neutral-To-Drive/Reverse Shift Under
CODE P099 (3)(6) Cruise Control Servo Applied Not In Cruise
(1) This fault turns on Malfunction Indicator Light (MIL).
(2) This fault turns on SERVICE VEHICLE SOON message on DIC.
(3) This fault does not turn on any light or message.
(4) This fault disengages TCC for ignition cycle.
(5) This fault enables EVAP solenoid.
(6) This fault disables cruise control for ignition cycle.
(7) This fault disables EGR solenoid.