Cadillac DeVille 4.6L – DeVille 4.9L – Eldorado 4.6L – Seville 4.6L OBD1 Codes

Model	Year	Engine identification	System
DeVille 4.6L	1994-95	VIN position 8 = Y	GM
DeVille 4.9L	1994-95	VIN position 8 = B	GM
Eldorado 4.SL	1993-95	VIN position 8 = Y/9	GM
Seville 4.SL	1993-95	VIN position 8 = Y/9	GM

General information

Refer to the front of this manual for general test conditions, terminology, detailed descriptions of wiring faults and a general trouble shooter for electrical and mechanical faults.
Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
ECM operates in backup mode if sensors fail, to enable vehicle to be driven to repair shop.
Trouble codes can be displayed by the driver information display.

Accessing

Switch ignition ON.
Simultaneously press and hold the A/C control panel ‘OFF’ and ‘WARMER’ buttons [1] & [2] .
When all segments of the display illuminate:

o Release the A/C control panel ‘OFF’ and ‘WARMER’ buttons [1] & [2].

Trouble codes will be displayed on the driver information display [3] .
Trouble codes will be displayed in ascending order.

NOTE: All ECM codes start with the letter ‘P’. Trouble codes for other systems may also be displayed.

All current trouble codes end with the letter ‘C’.
All history trouble codes end with the letter ‘H’.
If no ECM trouble codes are stored, ‘NO E CODE’ or ‘NO P CODE’ will be displayed.

NOTE: If ‘NO E DATA’ or ‘NO P DATA’ is displayed there is a communication problem between the ECM and the instrument panel. • When all trouble codes have been displayed: o Press the ‘AUTO’ or ‘DEFOG’ button [4] or [5] or switch ignition OFF.

Erasing

Switch ignition ON .
Simultaneously press and hold the A/C control panel ‘OFF’ and ‘WARMER’ buttons [1] & [2] .
When all segments of the display illuminate:

o Release the A/C control panel ‘OFF’ and ‘WARMER’ buttons [1] & [2]. • Trouble codes will be displayed on the driver information display [3]. NOTE: Pressing and releasing the ‘LOW’ button [6] will bypass trouble code display. • When all trouble codes have been displayed: o Press and release the ‘LOW’ button [6] until ‘PCM’ is displayed.

Press and release the ‘HI’ button [7] .
Press and release the ‘LOW’ button [6] until ‘PCM CLEAR CODES’ is displayed.
Press and release the ‘HI’ button [7].
‘PCM CODES CLEAR’ will be displayed for 3 seconds.
Press the ‘AUTO’ or ‘DEFOG’ button [4] or [5] or switch ignition OFF.

Trouble code identification

Trouble code	Fault location	Probable cause
P012 [1]	Ignition control module (lCM) -4X reference circuit malfunction	Wiring open circuit/short circuit to groundl short circuit to positive, ICM, ECM
P012 [2]	Ignition control module (ICM) -no distributorreference signal	Wiring open circuit/short circuit to ground/short circuit to positive, CKP sensor, ICM, ECM
P013	Heated oxygen sensor (H02S) 2, bank 1 -opencircuit	Wiring open circuit/short circuit to groundl short circuit to positive, H02S, ECM
P014	Engine coolant temperature (ECT) sensor short circuit	Wiring short circuit to ground, ECT sensor, ECM
P015	Engine coolant temperature (ECT) sensor open circuit	Wiring open circuit, ECT sensor, ECM
P016	Battery voltage highllow	Wiring, alternator, ECM
P017	Heated oxygen sensor (H02S) 1, bank 2 -opencircuit	Wiring open circuit/short circuit to groundl short circuit to positive, H02S, ECM
P019	Fuel pump circuit -short circuit	Wiring short circuit to positive, fuel pump relay, engine oil pressure warning lamp switch
P020	Fuel pump circuit -open circuit	Wiring open circuit/short circuit to ground, fuel pump relay, fuel pump, engine oil pressure warning lamp switch, engine oil pressure too low
P021	Throttle position (TP) sensor -voltage high	Wiring open circuit/short circuit to positive, TP sensor, ECM
P022	Throttle position (TP) sensor -voltage low	Wiring open circuit/short circuit to ground, TP sensor, ECM
P023	Ignition control module (ICM) -circuit malfunction	Wiring open circuit/short circuit to positive, ICM
P024	Vehicle speed sensor (VSS)	Wiring open circuit/short circuit to ground, VSS,ECM
P025	Ignition control module (ICM) -24X signal circuit malfunction	Wiring open circuit/short circuit to ground, ICM, ECM
P026	Closed throttle position (CTP) switch short circuit	Wiring short circuit to ground, ISC actuator, ECM
P027	Closed throttle position (CTP) switch open circuit	Wiring open circuit, ISC actuator, ECM
P028	Transm’ission pressure switch -circuit malfunction	Wiring open circuit/short circuit to ground, transmission pressure switch, ECM
P029	Shift solenoid (SS) B	Wiring open circuit/short circuit to ground, transmission mechanical fault, SS, ECM
P030	Idle speed (ISC) actuator	Wiring open circuit/short circuit to ground, throttle valve tight/sticking, ISC actuator, ECM
P031	Manifold absolute pressure (MAP) sensor -short circuit	Wiring short circuit to positive, hose blockedl leaking, MAP sensor, ECM
P032	Manifold absolute pressure (MAP) sensor -open circuit	Wiring open circuit/short circuit to ground, MAP sensor, ECM
P033	Brake pedal position (BPP) switch -extendedtravel contacts -circuit malfunction	Wiring open circuit/short circuit to groundl positive
P034	Manifold absolute pressure (MAP) sensor voltage high	Wiring open circuit/short circuit to positive, vacuumleak, MAP sensor, ECM
P035	Ignition control module (ICM) -reference low circuitmalfunction	Wiring open circuit/short circuit to positive, ICM, ECM
P036	Exhaust gas recirculation (EGR) solenoid position sensor	Wiring open circuit/short circuit to groundl short circuit to positive, EGR valve, ECM
P037	Intake air temperature (IAT) sensor short circuit	Wiring short circuit to ground, IAT sensor, ECM
P038	Intake air temperature (IAT) sensor -open circuit	Wiring open circuit, IAT sensor, ECM
P039	Torque converter clutch (TCC) -not engaging	Wiring open circuit/short circuit to ground, BPP switch for TCC, supply wire, TCC solenoid, transmission mechanical fault, ECM
P040	Power steering pressure (PSP) switch -open circuit	Wiring open circuit/short circuit to ground, PSP switch, ECM
P041	Ignition control module (ICM) -camshaft position(CMP) signal	Wiring open circuit/short circuit to ground, CMP sensor, ICM, ECM
P042	Heated oxygen sensor (H02S) 1, bank 2 mixture lean	Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, H02S
P043	Heated oxygen sensor (H02S) 1, bank 2 mixture rich	Wiring open circuit, fuel pressure high, injector(s) leaking, H02S contamination, EVAP canister purge valve, TP sensor, EGR system, H02S
P044	Heated oxygen sensor (H02S) 2, bank 1 mixture lean	Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, H02S
P045	Heated oxygen sensor (H02S) 2, bank 1 mixture rich	Wiring open circuit, fuel pressure high, injector(s)leaking, H02S contamination, EVAP canister purge valve, TP sensor, EGR system, H02S
P046	Long term fuel trim -imbalance bank 1lbank 2	Injector(s) leaking, H02S, intake/exhaust system leaking
P047	Body control module (BCM), CAN data buscommunication malfunction	Wiring, BCM
P048	Exhaust gas recirculation (EGR) system	Wiring open circuit/short circuit to ground, EGR system blocked, EGR valve, ECM
P051	Engine control module (ECM) -PROM	Insecure PROM, incorrect PROM, ECM
P052	Engine control module (ECM) -memory reset	Battery disconnected, wiring
PO53 1	Ignition control module (ICM) -4X reference circuit malfunction	Wiring open circuit/short circuit to ground, ICM, ECM
PO53 2	Ignition control module (ICM) -intermittentdistributor reference signal	Wiring open circuit/short circuit to groundl short circuit to positive, CKP sensor
P055	Closed throttle position (CPT) -range	Throttle valve tight/sticking, ISC actuator, TP sensor, cruise control cable
P056	Turbine shaft speed (TSS) sensor -circuitmalfunction	Wiring, TSS sensor, ECM
PO57	Transmission fluid temperature (TFT) sensor short circuit	Wiring short circuit to ground, TFT sensor, ECM
P058	Immobilizer control module -fuel enable signal	Wiring open circuit/short circuit to ground, immobilizer control module, ECM
P059	Transmission fluid temperature (TFT) sensor open circuit	Wiring open circuit, TFT sensor, ECM
P060	Park/neutral input with cruise control engaged	Driver error, wiring open circuit/short circuit to ground, TFP switch
P061	Cruise control vent solenoid	Wiring open circuit/short circuit to groundl short circuit to positive, cruise control vent solenoid, cruise control servo, ECM
P062	Cruise control vacuum solenoid	Wiring open circuit/short circuit to groundl short circuit to positive, cruise control vacuum solenoid,cruise control servo, ECM
P063	Cruise control -set speed/vehicle speed mismatch	Wiring open circuit/short circuit to groundl short circuit to positive, hoses leaking, cruise control servo, ECM
P064	Cruise control -acceleration too high	Slippery road conditions
P065	Cruise control servo position sensor -circuit malfunction	Wiring open circuit/short circuit to groundl short circuit to positive, cruise control servo, ECM
P066	Cruise control -engine speed too high	Slippery road conditions, transmission mechanical fault
P067	Cruise control switch -circuit malfunction	Wiring open circuit/short circuit to groundl short circuit to positive, cruise control switch, ECM
P068	Cruise control servo position sensor -range	Wiring, hoses blockedlleaking, brake pedal vacuum valve, cruise control servo, ECM
P069	Cruise control disabled -traction control system (TCS) active	Slippery road conditions
P070	Throttle position (TP) sensor -intermittent signal	Wiring open circuit/short circuit to groundl short circuit to positive, TP sensor
P071	Manifold absolute pressure (MAP) sensorintermittent signal	Wiring open circuit/short circuit to groundl short circuit to positive, MAP sensor
P073	Engine coolant temperature (ECT) sensor intermittent signal	Wiring open circuit/short circuit to groundl short circuit to positive, ECT sensor
P074	Intake air temperature (IAT) sensor -intermittent signal	Wiring open circuit/short circuit to groundl short circuit to positive, IAT sensor
P075	Vehicle speed sensor (VSS) -circuit malfunction	Wiring open circuit/short circuit, VSS
P076	Transmission pressure control (PC) solenoid circuit malfunction	Wiring, PC solenoid, ECM
P080 [1]	Throttle position (TP) sensor -idle leamed incomplete	TPS/idle learn procedure not completed
P080 [2]	Fuel system rich	Fuel pressure high, injector(s) leaking, EVAP system
P081	Camshaft position (CMP) sensor/4X reference circuit -signal variation	Electromagnetic interference, wiring, CMP sensor,mechanical fault
P083	Ignition control module (ICM) -24X reference circuit malfunction	Wiring open circuit/short circuit/short circuit to positive, CKP sensor(s), ICM, ECM
P085	Idle throttle angle -too high	Throttle valve tight/sticking, TP sensor, ISC actuator
PO86	Transmission gear ratio	TSS sensor, VSS, transmission mechanical fault, ECM
P088	Torque converter clutch (TCG) -stuck ON	Wiring short circuit to ground, transmission internal wiring, TCC solenoid, ECM
P089	Extended shift -adaptation limit reached	Transmission mechanical fault
P090	Brake pedal position (BPP) switch TCC	Wiring open circuit/short circuit to ground, incorrectly adjusted, BPP switch, ECM
P091	Transmission range (TR) switch -circuit malfunction	Wiring open circuit/short circuit to ground, incorrectly adjusted, TR switch, ECM
P092	Heated windshield request -circuit malfunction	Wiring short circuit to ground, heated windshield module, ECM
P093	Traction control system (TCS) -torque requestcircuit	Wiring open circuit/short circuit to ground! short circuit to positive, ABS control module trouble code(s) stored, ECM
P094	Shift solenoid (SS) A -ratio problem	Wiring open circuit/short circuit to ground, 55, transmission mechanical fault, ECM
P095	Engine stall or near stall detected	ECM trouble code(s) stored, wiring, mechanical fault, transmission mechanical fault
P096	Torque converter clutch (TCG) -over-stressed	ECM trouble codes stored, driver error
P097	Transmission shifted from PIN to D/R at high throttle angle	Driver error, wiring, TR switch
P098	Transmission shifted from PIN to D/R in idle speed control (ISG) range	Driver error, wiring, TR switch
P099	Cruise control servo -position high after disengagement	Wiring, throttle valve tight/sticking, cruise control servo
P102	Brake servo vacuum sensor -short circuit	Wiring open circuit/short circuit to positive, brake servo vacuum sensor, ECM
P103	Brake servo vacuum sensor -open circuit	Wiring open circuit/short circuit to ground, brake servo vacuum sensor, ECM
P105	Brake servo vacuum sensor -voltage low	Wiring short circuit to ground, brake servo vacuum sensor, ECM
P106	Brake pedal position (BPP) switch, brake lamps -circuit malfunction	Wiring, BPP switch
P110	Alternator ‘L’ terminal -circuit malfunction	Wiring open circuit/short circuit to ground, alternator,battery temperature sensor, ECM
P112	Engine control module (ECM) -EEPROM	ECM
P117	Shift solenoid (SS) AlB -circuit malfunction	Wiring open circuit/short circuit to ground,transmission mechanical fault, ECM
P0131	Knock sensor (KS) -test failure	Wiring, KS incorrectly fitted, KS, ECM
P0132	Knock sensor (KS) -circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, KS incorrectly fitted, KS, insecure PROM, ECM
P0137	CAN data bus -anti lock brake system (ABS)Itraction control system (TCS)	Wiring, ABS control module trouble code(s) stored