GM OBD/OBD2 Codes >> GM Achieva/Alero/Cutlass

GM

Various Models
Flash codeFault locationProbable cause
P0000-0999Refer to OBD-II trouble code table
P1133Heated oxygen sensor (HO2S)/oxygen sensor (O2S) 1 – insufficient switchingWiring, oxygen sensor heater, exhaust system leaking, HO2S
P1137Heated oxygen sensor (HO2S)/oxygen sensor (O2S) 2 – insufficient switchingWiring, HO2S/O2S, ECM
P1138Heated oxygen sensor (HO2S)/oxygen sensor (O2S) 2 – insufficient switchingWiring, HO2S/O2S, ECM
P1171Fuel system – lean during accelerationFuel filter, fuel pump, HO2S/O2S, injectors
P1336Crankshaft position sensor (CKP) – variation not learnedlearning procedure not performed
P1380Rough road signal – signal errorABS control module trouble code(s) stored
P1381Rough road signal – no communication from antilock brake system (ABS) CAN data busWiring open circuit, ABS system
P1404Exhaust gas recirculation (EGR) valve – stuck openWiring open circuit/short circuit to positive, EGR valve position sensor, EGR solenoid
P1406Exhaust gas recirculation (EGR) valve position sensor – circuit malfunctionWiring open circuit/short circuit to ground/short circuit to positive, EGR valve position sensor, EGR valve
P1441Evaporative emission (EVAP) system – leak detectedHose connection(s), EVAP canister, EVAP canister purge valve
P1520Park/neutral position (PNP) switchWiring short to ground, incorrectly adjusted
P1601CAN data bus – circuit malfunctionWiring open circuit/short circuit to ground/short circuit to positive, instrument panel, ECM
P1621Engine control module (ECM) – memory performanceECM
P1626Data bus, immobilizerWiring, body control module (BCM) trouble code(s) stored
P1627Engine control module (ECM)ECM
P1629Immobilizer control module – fuel enable signalIncorrect ignition key, wiring open circuit/short circuit to ground/short circuit to positive, immobilizer control module, ECM
P1630Engine control module (ECM), immobilizer code learning modeImmobilizer code not programmed
P1631Engine control module (ECM) – incorrect immobilizer codeIncorrect key, immobilizer code not programmed
P1632Engine control module (ECM), fuel disable signalFuses, BCM, immobilizer code
P1680Engine control module (ECM)ECM
P1681Engine control module (ECM)ECM
P1683Engine control module (ECM)ECM
U1016Instrument panel, CAN data bus – communication malfunctionWiring open circuit/short circuit to ground/short circuit to positive, instrument panel, ECM
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