Oldsmobile Achieva – Bravada – Cutlass – Eighty Eight – Ninety Eight/Regency – Silhouette OBD1 Codes

Model	Year	Engine identification	System
Achieva 3.1 L	1996-97	VIN position 8 = M	GM
Bravada 4.2L	2002-04	VIN position 8 = S	GM
Bravada 4.3L	1996-02	VIN position 8 = W	GM
Cutlass Ciera/Cruiser 3.1 L	1994-96	VIN position 8 = M	GM
Cutlass Supreme 3.1 L	1996-97	VIN position 8 = M	GM
Cutlass Supreme 3.4L	1994-97	VIN position 8 = X	GM
Eighty Eight 3.8L	1994-97	VIN position 8 = 1/K/L	GM
Ninety Eight/Regency 3.8L	1994-96	VIN position 8 = 1/L	GM
Silhouette 3.4L	1996-97	VIN position 8 = E	GM
Silhouette 3.8L	1994-95	VIN position 8 = L	GM

General information

Malfunction indicator lamp (MIL) will illuminate or flash if certain faults are recorded .
ECM operates in backup mode if sensors fail, to enable vehicle to be driven to repair shop.

Accessing

Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC).
12 pin connector [1]:

o Cutlass Supreme –> 1995.
o Cutlass Ciera/Cruiser –> 1995.
o Silhouette –>1995.

16 pin connector [2] :

o Cutlass Supreme 1996 –>.
o Cutlass Ciera/Cruiser 1996–>.
o Silhouette 1996–>.
o Achieva.
o Aurora.
o Bravada.
o Eighty eight.
o Ninety eight.
o Regency.

Erasing

12 pin connector

NOTE: Disconnecting battery ground lead may cause driveability problems until the engine management system relearns basic values.

Ensure ignition switched OFF.
Disconnect battery ground cable for 30 seconds.
Reconnect battery ground cable.
Repeat checking procedure to ensure no trouble codes remain in ECM fault memory.

NOTE: Disconnecting battery ground lead may also erase memory from electronic units, such as radio.

• Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC).

16 pin connector

After the faults have been rectified, the manufacturer recommends that trouble codes are erased by using a Scan Tool connected to the data link connector (DLC)

Trouble code identification

Scan code	Fault location	Probable cause
PO,P2,UO	Refer to OBO-II trouble code tables	–
P1106	Manifold absolute pressure (MAP) sensor circuit intermittent -voltage high	Wiring open circuit/short circuit to ground! short circuit to positive
P1107	Manifold absolute pressure (MAP) sensor circuit intermittent -voltage low	Wiring short circuit to ground
P1108	Barometric pressure (BARO) sensor!manifold absolute pressure (MAP) sensor -comparison toohigh	Wiring open circuit/short circuit to positive, MAPsensor, ECM
P1111	Intake air temperature (IAT) sensor -circuitintermittent -voltage high	Wiring open circuit, ground lead defective
P1112	Intake air temperature (IAT) sensor -circuitintermittent -voltage low	Wiring short circuit to ground
P1114	Engine coolant temperature (ECT) sensor circuitmalfunction -voltage low	Wiring short circuit to ground
P1115	Engine coolant temperature (ECT) sensor circuitmalfunction -voltage high	Wiring open circuit, ground lead defective
P1121	Throttle position (TP) sensor -circuit malfunction -voltage high	Wiring short circuit to positive, ground lead defective
P1120	Throttle motor position sensor 1 -circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, throttle control unit, ECM
P1122	Throttle position (TP) sensor -circuit malfunction -voltage low	Wiring open circuit/short circuit to ground
P1133	Heated oxygen sensor (H02S) 1, bank 1 insufficient switching	Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1134	Heated oxygen sensor (H02S) 1, bank 1 slow response	Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1137	Heated oxygen sensor (H02S) 2 -voltage low	Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1138	Heated oxygen sensor (H02S) 2 -voltage high	Wiring short circuit to positive, fuel pressure high, fuel contamination, injector(s) leaking, H02S, ECM
P1153	Heated oxygen sensor (H02S) 1, bank 2insufficient switching	Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1154	Heated oxygen sensor (H02S) 1, bank 2 slow response	Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1171	Heated oxygen sensor (H02S) 1 -voltage low	Fuel supply blocked, injector(s) blocked, manifold absolute pressure (MAP) sensor wiring
P1200	Injector(s) -circuit malfunction	Wiring open circuit/short circuit to groundl short circuit to positive, injectors, ECM
P1220	Throttle motor position sensor 2 -circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, throttle control unit, ECM
P1221	Throttle motor position sensor 1/2 -signal variation	Wiring, throttle control unit, ECM
P1257	Supercharger (SC) -over-boost	Hoses blockedlleaking/interchanged/not connected, wiring short circuit to ground, supercharger (SC) bypass valve tight/ sticking, supercharger (SC) bypass valve solenoid, ECM
P1271	Accelerator pedal position (APP) sensor 1/2signal variation	Wiring, APP sensor, ECM
P1275	Accelerator pedal position (APP) sensor 1 circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, APP sensor, ECM
P1280	Accelerator pedal pOSition (APP) sensor 2 circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, APP sensor, ECM
P1336	Crankshaft position (CKP) sensor -variation notlearned	Learning procedure not performed
P1345	Crankshaft position (CKP) sensor/camshaft position (CMP) sensor -signal variation	CKP sensor, distributor/camshaft alignment, mechanical fault
P1350	Ignition control module (ICM) -bypass line monitor circuit malfunction	Wiring open circuit/short circuit to groundl short circuit to positive, ICM, ECM
P1351	Ignition control module (ICM) -IC circuit, voltage high	Wiring open circuit, ICM, ECM
P1361	Ignition control module (ICM) -IC circuit, voltage low	Wiring short circuit to ground, ICM, ECM
P1374	Ignition control module (ICM) -3X reference circuit malfunction	Wiring open circuit/short circuit to groundl short circuit to positive, wiring routed near spark plug wires, ignition coils arcingl tracking, ICM, ECM
P1380	Rough road signal -signal error	ABS control module trouble code(s) stored
P1381	Rough road signal -no communication from ASS CAN data bus	Wiring open circuit, ABS system
P1403	Exhaust gas recirculation (EGR) valve solenoid 1	Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
P1404	Exhaust gas recirculation (EGR) valve -stuck open	Wiring open circuit/short circuit to positive, exhaust gas recirculation (EGR) valve position sensor, EGR solenoid
P1404	Exhaust gas recirculation (EGR) valve solenoid 2	Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
P1405	Exhaust gas recirculation (EGR) valve solenoid 3	Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
P1406	Exhaust gas recirculation (EGR) valve position sensor circuit malfunction	Wiring open circuit/short circuit to groundl short circuit to positive, EGR valve position sensor,EGR valve
P1415	Secondary air injection (AIR) system	Wiring, hoses blockedlleaking, AIR valve
P1416	Secondary air injection (AIR) system	Wiring, hoses blockedlleaking, AIR valve, AIR pump relay
P1441	Evaporative emission (EVAP) system -leak detected	Hose connection(s), EVAP canister, EVAP canister purge valve
P1442	Evaporative emission (EVAP) system vacuum switch -circuit malfunction	Hoses blockedlleaking, wiring, EVAP canister, ECM
P1481	Engine cooling fan system -cooling fan speed signal missing	Wiring open circuit/short circuit to ground, supply wire, engine cooling fan clutch, ECM
P1482	Engine cooling fan system -clutch circuit malfunction	Wiring open circuit/short circuit to ground, supply wire, engine cooling fan clutch, ECM
P1483	Engine cooling system -performance	Cooling system, ECT sensor, IAT sensor
P1484	Engine cooling fan system -maximum fan speed tolerance exceeded	Wiring open circuit/short circuit to ground, supply wire, engine cooling fan clutch, ECM
P1508	Idle air control (lAC) valve -low rpm	Wiring open circuit/short circuit to groundl short circuit to positive, lAC valve, throttle valve tight/sticking
P1509	Idle air control (lAC) valve -high rpm	Wiring open circuit/short circuit to groundl short circuit to positive, lAC valve, throttle valve tight/sticking
P1512	Throttle control unit -signal variation	Wiring, throttle control unit, ECM
P1514	Intake air flow -excessive flow	Throttle control unit, MAP sensor, CMP sensor signal, ECM
P1515	Throttle command/actual throttle position -signal variation	Wiring, throttle valve sticking, throttle control unit, ECM
P1516	Throttle command/actual throttle position -signal variation	Wiring, throttle valve sticking, throttle control unit, ECM
P1520	Park/neutral position (PNP) switch	Wiring short circuit to ground, incorrectly adjusted PNP switch
P1523	Throttle control unit, throttle position during battery saving mode	Throttle valve movement restricted, throttle control unit, ECM
P1530	AlC refrigerant pressure switch -engine coolant blower motors	Wiring open circuit, AlC refrigerant pressure switch, ECM
P1530	AlC refrigerant pressure sensor, circuit malfunction	AlC refrigerant pressure, wiring open circuit/ short circuit to ground, AlC refrigerant pressure sensor, ECM
P1531	Low AlC refrigerant charge	Low Ale refrigerant charge, wiring open circuit/short circuit to ground/short circuit to positive, AlC refrigerant low pressure switch, ECM
P1550	Cruise control stepper motor, circuit malfunction	Wiring open circuit/short circuit to ground, cruise control module, ECM
P1554	Cruise control status circuit -high voltage	Wiring open circuit/short circuit to ground, cruise control module, ECM
P1558	Cruise control servo -servo position sensor low	Hoses leaking, cruise control servo
P1561	Cruise control vent solenoid	Wiring open circuit/short circuit to ground! short circuit to positive, cruise control vent solenoid, cruise control servo, ECM
P1562	Cruise control vacuum solenoid	Wiring open circuit/short circuit to ground! short circuit to positive, cruise control vacuum solenoid, cruise control servo, ECM
P1565	Cruise control servo position sensor -circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, cruise control servo, ECM
P1567	Cruise control switch -circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, cruise control switch, ECM
P1568	Cruise control servo -servo position sensor high	Hoses blockedlleaking, brake pedal vacuum valve, cruise control servo
P1571	Traction control system (TCS), torque request circuit	Wiring open circuit/short circuit to ground! short circuit to positive, ABS control module trouble code(s) stored, ECM
P1573	CAN data bus -antilock brake system (ABS)! traction control system (TCS)	Wiring, ABS control module trouble code(s) stored
P1574	Brake pedal position (BPP) switch -voltage high	Wiring, ABS
P1599	Cruise control -power management mode	Cruise control accelerator cable adjustment, hoses blocked, brake pedal vacuum valve, cruise control servo
P1600	Engine control module (ECM)	ECM
P1619	Engine oil life monitor reset switch -circuit malfunction	Wiring short circuit to ground, engine oil life monitor reset switch, ECM
P1621	Engine control module (ECM) -memory performance	ECM
P1623	Engine control module (ECM) -PROM	Insecure PROM, incorrectly coded
P1626	Immobilizer control module	Wiring, body control module (BCM) trouble code(s) stored
P1627	Engine control module (ECM) -memory performance	ECM
P1629	Immobilizer control module -fuel enable signal	Incorrect ignition key, wiring open circuit/ short circuit to ground/short circuit to positive,immobilizer control module, ECM
P1630	Battery voltage highllow	Wiring, alternator
P1630	Engine control module (ECM), ignition supply voltage	Fuse, wiring open circuit, ECM
P1631	Engine control module (ECM) -incorrect immobilizer code	Incorrect key, immobilizer code not programmed
P1633	Engine control module (ECM), ignition supply voltage	Fuse, wiring open circuit, ECM
P1635	Sensor supply voltage -circuit A malfunction	Wiring short circuit to ground/positive, ground wiring open circuit, TP sensor, MAP sensor, EGR valve position sensor, ECM
P1639	Sensor supply voltage -circuit B malfunction	Wiring short circuit to ground/positive, ground wiring open circuit, AlC refrigerant pressure sensor, fuel tank pressure (FTP) sensor, ECM
P1640	Engine control module, quad driver/output driver	Wiring, ECM [[!]
P1641	Malfunction indicator lamp (MIL) -circuit malfunction	Wiring open circuit/short circuit to ground, MIL,supply wire, ECM
P1642	Secondary air injection (AIR) pump/solenoid relay -circuit malfunction	Wiring open circuit/short circuit to ground/ short circuit to positive, AIR pump/solenoid relay
P1643	Fuel pump control module -circuit malfunction	Wiring open circuit/short circuit to ground/ short circuit to positive, fuel pump control module, ECM
P1645	Supercharger (SC) control valve solenoid -circuit malfunction	Wiring open circuit/short circuit to ground, SC control valve solenoid, ECM
P1650	Engine control module, quad driver/output driver	Wiring, ECM [[!]
P1651	Engine coolant blower motor relay 1 -circuit malfunction	Wiring open circuit/short circuit to ground, supply wire, engine coolant blower motor relay, ECM
P1652	Engine coolant blower motor relay 2 -circuit malfunction	Wiring open circuit/short circuit ·to ground, supply wire, engine coolant blower motor relay(s), ECM
P1653	Fuel gauge tank sensor -circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, instrument panel, ECM
P1653	Traction control system (TCS) -delivered torque circuit	Wiring open circuit/short circuit to ground! shortcircuit to positive, ABS control module trouble code(s) stored, ECM
P1654	AlC compressor clutch relay -circuit malfunction	Wiring open circuit/short circuit to ground, AlC compressor clutch relay, ECM
P1655	Evaporative emission (EVAP) canister purge valve -circuit malfunction	Wiring open circuit/short circuit to ground, EVAP canister vent valve, ECM
P1662	Cruise control inhibit circuit -circuit malfunction	Wiring open circuit/short circuit to ground, cruise control motor/actuator, cruise control module, ECM
P1663	Alternator warning lamp -circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, instrument panel, ECM
P1665	Evaporative emission (EVAP) canister vent valve -circuit malfunction	Wiring open circuit/short circuit to ground, EVAP canister vent valve, ECM
P1670	Engine control module, quad driver/output driver	Wiring, ECM iI!l
P1671	Engine oil change warning lamp -circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, engine oil change warning lamp, ECM
P1671	Malfunction indicator lamp (MIL) -circuit malfunction	Wiring open circuit/short circuit to ground/ short circuit to positive, MIL, ECM
P1672	Engine oil level warning lamp -circuit malfunction	Wiring open circuit/short circuit to ground/ short circuit to positive, instrument panel, ECM
P1673	Engine coolant ‘hot’ warning lamp -circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, instrument panel, cooling system, ECM
P1674	Tachometer -circuit malfunction	Wiring open circuit/short circuit to ground! short circuit to positive, instrument panel, ECM
P1675	Evaporative emission (EVAP) canister vent valve -circuit malfunction	Wiring open circuit/short circuit to ground, EVAP canister vent valve, ECM
P1676	Evaporative emission (EVAP) canister purge valve -circuit malfunction	Wiring open circuit/short circuit to ground, EVAP canister purge valve, ECM
P1680	Engine control module (ECM)	ECM
P1681	Engine control module (ECM)	ECM
P1682	Engine control module (ECM), ignition supply voltage	Fuse, wiring open circuit, ECM
P1683	Engine control module (ECM)	ECM
P1860	Torque converter clutch (TCC) solenoid -circuitmalfunction	Wiring open circuit/short circuit to ground, TCC solenoid, ECM
U1026	Transmission control module (TCM)/four wheeldrive control module, CAN data bus -communication malfunction	Wiring, SCM
U1041	Antilock brake system (ABS)/traction controlsystem (TCS), CAN data bus -communicationmalfunction	Wiring, ABSfTCS trouble codes stored
U1064	Body control module (SCM), CAN data bus -communication malfunction	Wiring, BCM