Oldsmobile Achieva – Alero – Cutlass Ciera Trouble Code Info

Model Year Engine identification System
Achieya  2.4L 1996-98 VIN  position 8 =  T   GM
Alero 2.2L  (L61) 2002-04 YIN  position 8 = F   GM
Alero 2.4L 1999-01 YIN  position 8 = T   GM
Cutlass Ciera 2.2L 1996 YIN  position 8  = 4   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 or flash 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 only be displayed by using a Scan Tool connected to the data link connector (DLC):
  1. o Achieva  1
  2. o Alero/Cutlass Ciera  2


  • 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 OBD-II trouble code tables
P1133 Heated oxygen sensor (H025)/oxygen sensor(025) 1 -insufficient switching Wiring, oxygen sensor heater, exhaust system leaking, H025
P1134 Heated oxygen sensor (H025) 1 -slow response Wiring open circuit/short circuit to ground, exhaust system leaking, H025
P1137 Heated oxygen sensor (H02S)/oxygen sensor(02S) 2 -insufficient switching Wiring, H02S/02S, ECM
P1138 Heated oxygen sensor (H02S)/oxygen sensor(025) 2 -insufficient switching Wiring, H02S/02S, ECM
P1171 Fuel system -lean during acceleration Fuel filter, fuel pump, H025!025, injectors
P1336 Crankshaft position (CKP) sensor -variation not learned Learning procedure not performed
P1380 Rough road signal -signal error ABS control module trouble code(s) stored
P1381 Rough road signal -no communication fromantilock brake system (ABS) CAN data bus Wiring open circuit, ABS system
P1404 Exhaust gas recirculation (EGR) valve -stuck open Wiring open circuit/short circuit to positive, EGR valve position sensor, EGR solenoid
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
P1441 Evaporative emission (EVAP) system -leak detected Hose connection(s), EVAP canister, EVAP canister purge valve
P1520 Park/neutral position (PNP) switch Wiring short circuit to ground, incorrectly adjusted
P1546 AlC compressor clutch relay -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, AlC compressor clutch relay, ECM
P1554 Cruise control status circuit Wiring short circuit to ground, cruise control module, ECM
P1585 Cruise control system -inhibit output circuit Wiring open circuit/short circuit to groundl short circuit to positive, supply wire, cruise controlmotor/actuator, ECM
P1601 CAN data bus -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, instrument panel, ECM
P1600 Engine control module (ECM) ECM
P1601 Data bus -circuit malfunction Wiring open circuit/short circuit to ground! short circuit to positive, instrument panel, ECM
P1621 Engine control module (ECM) -memory performance ECM
P1626 Data bus, immobilizer Wiring, body control module (BCM) trouble code(s) stored
P1627 Engine control module (ECM) 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 Engine control module (ECM); immobilizer code leaming mode Immobilizer code not programmed
P1631 Engine control module (ECM) -incorrectimmobilizer code Incorrect key, immobilizer code not programmed
P1632 Engine control module (ECM), fuel disable signal Fuses, BCM, immobilizer code
P1680 Engine control module (ECM) ECM
P1681 Engine control module (ECM) ECM
P1683 Engine control module (ECM) ECM
U1016 Instrument panel, CAN data bus communication malfunction Wiring open circuit!short circuit to ground/ short circuit to positive, instrument panel, ECM