Pontiac Firebird – Grand Prix – Montana/SV6 – Sunfire – Trans Sport (1995 – 2008) Trouble Code Info

Model Year Engine identification System
Firebird 3.8L 1995-02 VIN  position 8 = K GM
Firebird 5.7L 1996-02 VIN  position 8 =  G/P GM
Grand Prix 3.1 L 1996-03 VIN  position 8  = M/J GM
Grand Prix 3.4L 1996 VIN  position 8 = X GM
Grand Prix 3.8/5.3L 1997-08 VIN  position 8 = 1/2/4/C/K GM
Montana/SV6 3.4/3.5L 1999-07 VIN  position 8 = E/L GM
Sunfire 2.2L 1995-05 VIN  position 8  =  4/5/F GM
Sunfire 2.3L 1995 VIN  position 8 =  D GM
Sunfire 2.4L 1996-02 VIN  position 8 =  T GM
Trans Sport 3.4L 1996-98 VIN  position 8 = E 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.
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Accessing

• Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC) 1 or 2.

Erasing

• 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
P1101 Intake air flow -incorrect Wiring, mechanical fault, engine coolanttemperature (ECT) sensor, barometric pressure (BARO) sensor, intake air temperature (IAT) sensor, manifold absolute pressure (MAP) sensor, mass air flow (MAF) sensor, throttle position (TP) switch
P1106 Manifold absolute pressure (MAP) sensorvoltage high, intermittent Wiring open circuit/short circuit to positive, poor connections
P1107 Manifold absolute pressure (MAP) sensorvoltage low, intermittent Wiring short circuit to ground, poor connections
P1111 Intake air temperature (IAT) sensor -voltage high,intermittent Wiring open circuit/short to positive, poor connections
P1112 Intake air temperature (IAT) sensor -voltage low,intermittent Wiring short circuit to ground
P1114 Engine coolant temperature (ECT) sensorvoltage low, intermittent Wiring short circuit to ground, poor connections
P1115 Engine coolant temperature (ECT) sensorvoltage high, intermittent Wiring open circuit/short to positive, poor connections
P1120 Throttle motor position sensor 1 -circuitmalfunction Wiring, throttle control module
P1121 Throttle position (TP) sensor -voltage high,intermittent Wiring open circuit/short to positive, poor connections
P1122 Throttle position (TP) sensor -voltage low, intermittent Wiring open circuit/short to ground, poor connections
P1125 Accelerator pedal position (APP) sensor 1/2/3signal malfunction Wiring, APP sensor, ECM
P1133 Oxygen sensor (02S)/heated oxygen sensor(H02S) 1, bank 1 -insufficient switching Wiring, exhaust system leaking, 02S/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, bank 1 voltage low Wiring, exhaust system leaking, H025
P1138 Heated oxygen sensor (H02S) 2, bank 1 voltagehigh Wiring, H025
P1153 Heated oxygen sensor (H02S) 1, bank 2insufficient switching Wiring, oxygen sensor heater, exhaust systemleaking, H025
P1154 Heated oxygen sensor (H02S) 1, bank 2slow response Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1171 Fuel system -lean during acceleration Fuel filter, fuel pump, H025, injectors
P1189 Engine oil pressure warning lamp switch -circuit malfunction Wiring, engine oil pressure warning lamp switch
P1200 Injectors -circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, injectors, ECM
P1220 Throttle motor position sensor 2 -circuit malfunction Wiring, throttle control module
P1221 Throttle motor position sensor 1/2 signal variation Wiring, throttle control module
P1222 Injector control , circuit monitor -malfunction Injector, wiring
P1258 Engine overheating Cooling system, engine coolant temperature (ECT) sensor
P1260 Fuel pump, control signal -circuit malfunction Wiring, fuel pump control module, ECM
P1271 Accelerator pedal position (APP) sensor 1/2signal variation Wiring, APP sensor, ECM
P1272 Accelerator pedal position (APP) sensor 2/3signal variation Wiring, APP sensor, ECM
P1273 Accelerator pedal position (APP) sensor 1/3signal variation Wiring, APP sensor, ECM
P1275 Accelerator pedal position (APP) sensor 1 circuitmalfunction Wiring, APP sensor, ECM
P1276 Accelerator pedal position (APP) sensor 1 rangeperformance Wiring, APP sensor, ECM
P1280 Accelerator pedal position (APP) sensor 2 circuitmalfunction Wiring, APP sensor, ECM
P1281 Accelerator pedal position (APP) sensor 2 range performance Wiring, APP sensor, ECM
P1285 Accelerator pedal position (APP) sensor 3 circuitmalfunction Wiring, APP sensor, ECM
P1286 Accelerator pedal position (APP) sensor 3 range performance Wiring, APP sensor, ECM
P1336 Crankshaft position (CKP) sensor -variation not learned Learning procedure not performed
P1350 Ignition control system, bypass circuit -circuitmalfunction Wiring, poor connections, ICM, ECM
P1351 Ignition control system, coil -voltage high Wiring open circuit, ICM, ECM
P1352 Ignition control system, bypass circuit voltagehigh Wiring open circuit, ICM, ECM
P1361 Ignition control system, IC circuit -voltage low Wiring, circuit short circuit to ground, poor connections, ICM, ECM
P1362 Ignition control, bypass circuit -voltage low Wiring short circuit to ground, ICM, ECM
P1371 Ignition control’reference signal, low/high resolution -low signal lost Wiring,ICM
P1374 Crankshaft position (CKP) sensor, high to lowresolution frequency -signal variation Wiring, wiring routed near spark plug wires, ignition coils arcing/tracking, ICM, ECM
P1380 Antilock brake system (ABS)/traction controlsystem (TCS), rough road signal to ECM -malfunction ASS trouble coders) stored
P1381 Antilock brake system (ABS)/traction controlsystem (TCS), rough road signal to ECM -nocommunication Wiring, poor connections, ASS
P1400 Cold start emission control -malfunction Intake/exhaust leak/blockage, mechanical fault,idle speed control (ISC) system, ignition control,engine coolant temperature (ECT) sensor, H02S
P1404 Exhaust gas recirculation (EGR) valve -not fullyclosing Wiring, poor connections, EGR valve position sensor, EGR solenoid
P1406 Exhaust gas recirculation (EGR) valve positionsensor range performance Wiring, EGR valve tight/sticking, EGR valve position sensor
P1415 Secondary air injection (AIR) system, bank 1 Wiring, hoses blocked/leaking, AIR valve
P1416 Secondary air injection (AIR) system, bank 2 Wiring, hoses blocked/leaking, AIR valve
P1441 Evaporative emission (EVAP) system -leak detected Hose connection(s), EVAP canister, EVAP canister purge valve
P1442 Evaporative emission (EVAP) system vacuumswitch -circuit malfunction Hoses blocked/leaking, wiring, EVAP canister, ECM
P1483 Engine cooling system -performance Cooling system, engine coolant temperature(ECT) sensor, intake air temperature (IAT) sensor
P1508 Idle air control (lAC) valve -low rpm Wiring open circuit/short circuit to ground/short circuit to positive, lAC valve, throttle valve tight/sticking
P1509 Idle air control (lAC) valve -high rpm Wiring open circuit/short circuit to ground/short circuit to positive, lAC valve, throttle valve tight/sticking
P1514 Throttle control unit, intake air flow -excessive Throttle control unit, MAP sensor, CMP sensorsignal, ECM
P1515 Throttle command/actual throttle position -signalvariation Wiring, throttle valve sticking, throttle control module
P1516 Throttle command/actual throttle position -signal variation Wiring, throttle valve sticking, throttle control module
P1517 Throttle control module -malfunction Throttle control module
P1518 Throttle control module/ECM -communicationmalfunction Wiring, throttle control module, ECM
P1519 Throttle motor position sensor 1 -signalmalfunction Throttle control module
P1523 Throttle control unit, closed throttle position -performance Throttle valve movement restricted, throttle control unit
P1532 AlC refrigerant temperature sensor -voltage low Wiring open circuit/short circuit to ground, AlC refrigerant temperature sensor, ECM
P1533 AlC refrigerant temperature sensor -voltage high Wiring open circuit/short circuit to ground, AlC refrigerant temperature sensor, ECM
P1539 AlC compressor clutch relay -voltage high Wiring, AlC compressor clutch relay, ECM
P1543 AlC system -performance Refrigerant low, wiring, AlC refrigerant pressure sensor, AlC evaporator temperature sensor, ECM
P1545 AlC compressor clutch relay -voltage low Wiring, AlC compressor clutch relay, ECM
P1546 AlC compressor clutch relay -circuit malfunction Wiring, AlC compressor clutch relay, ECM
P1554 Cruise control status circuit -high voltage Wiring open circuit/short circuit to ground, cruise control module, ECM
P1571 Traction control system (TCS), torque request signal malfunction Wiring, poor connections, ABSITCS
P1572 Traction control system (TCS), active signal malfunction Wiring short to ground, ABSITCS, ECM
P1573 Engine control module (ECM), antilock brakesystem (ABS)/traction control system (TCS)communication -malfunction Wiring, poor connections, ABS control module, ECM
P1574 Brake pedal position (BPP) switch, voltage high Wiring, ABS
P1585 Cruise control system, inhibit output circuit Wiring, poor connections, cruise control motor/actuator, ECM
P1586 Cruise control system, brake switch 2 -circuit malfunction Wiring, poor connections, BPP switch
P1600 Engine control module (ECM) -malfunction Engine control module (ECM)
P1601 CAN data bus, engine control module(ECM)/antilock brake system (ABS)/traction control system (TCS)/instrumentation control module/diagnostic control module -not allmodules communicating Wiring, poor connections, ECM, ABSITCS, diagnostic control module, instrumentation control module
P1621 Engine control module (ECM) memory performance ECM
P1626 Engine control module (ECM) -fuel enable signal lost Wiring, poor connections, immobilizer control module, ECM
P1627 Engine control module (ECM) malfunction Engine control module (ECM)
P1629 Engine control module (ECM) -fuel enable signal not received Incorrect ignition key, wiring, poor connections, immobilizer control module, ECM
P1630 Engine control module (ECM). immobilizer code leaming mode ECM immobilizer code programming not completed
P1631 Engine control module (ECM) -incorrect immobilizer code Incorrect key, immobilizer code not programmed
P1632 Engine control module (ECM) -fuel disable signalreceived Fuses, SCM, immobilizer code
P1635 Engine control module (ECM). sensor supplyvoltage -circuit malfunction Wiring, poor connections, TP sensor, MAP sensor, EGR valve position sensor, fuel tank pressure (FTP) sensor, ECM
P1637 Alternator warning lamp, control signal -circuitmalfunction Wiring, instrument panel, ECM
P1639 Engine control module (ECM), sensor supplyvoltage -circuit malfunction Wiring, poor connections, AlC refrigerant pressure sensor, ECM
P1640 Engine control module (ECM), quad driver/output driver -circuit malfunction Wiring, ECM controlled components, ECM III
P1641 0 Malfunction indicator lamp (MIL) -circuit malfunction Wiring, poor connections, MIL, ECM
P1641 f) AlC compressor clutch relay -circuit malfunction Wiring open circuit/short circuit to ground, AlC compressor clutch relay, ECM
P1641 D Engine coolant blower motor relay 1 -circuitmalfunction Wiring, engine coolant blower motor relay, ECM
P1642 D Engine coolant blower motor relay 2 & 3 circuitmalfunction Wiring, engine coolant blower motor relay(s), ECM
P1642 9 Engine oil change warning lamp -circuit malfunction Wiring, ECM
P1642 III Secondary air injection (AIR) pump relay circuit malfunction Wiring, AIR pump relay, ECM
P1643 D Engine speed (RPM), engine control module (ECM)output signal -circuit malfunction Wiring, tachometer, ECM
P1643 9 Fuel pump, control signal -circuit malfunction Wiring, fuel pump control module, ECM
P1644 Traction control system (TCS), delivered torque signal -malfunction Wiring, poor connections, ECM
P1645 Supercharger (SC) bypass valve, control signal -circuit malfunction Wiring, SC bypass valve, ECM
P1650 Engine control module (ECM), quad driver/output driver -circuit malfunction Wiring, ECM controlled components, ECM III
P1651 Engine coolant blower motor relay 1 -circuitmalfunction Wiring, engine coolant blower motor relay, ECM
P1652 D Engine control module (ECM), vehicle speedsensor (VSS) output signal -circuit malfunction Wiring, poor connections, ECM
P1652 9 Engine coolant blower motor relay 2 & 3 circuit malfunction Wiring, engine coolant blower motor relay(s), ECM
P1653 ~ Fuel gauge, control signal -circuit malfunction Wiring, ECM
P1653 0 Engine oil level ‘low’ warning lamp, control signal -circuit malfunction Wiring short circuit to ground, ECM
P1653 EJ Traction control system (TCS), delivered torque signal -malfunction Wiring, poor connections, 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
P1657 Skip shift solenoid -circuit malfunction Wiring, skip shift solenoid, ECM
P1660 Engine control module (ECM), quad driver/output driver -circuit malfunction Wiring, ECM controiled components, ECM liJ
P1661 Malfunction indicator lamp (MIL) -circuit malfunction Wiring, MIL, ECM
P1662 Cruise control, inhibit output circuit malfunction Wiring open circuit/short circuit to ground, cruise control motor/actuator, cruise control module, ECM
P1663 Alternator warning lamp, control signal -circuit malfunction Wiring, instrument panel, ECM
P1664 Skip shift warning lamp -circuit malfunction Wiring, skip shift warning lamp, ECM
P1665 Evaporative emission (EVAP) canister vent valve -circuit malfunction Wiring open circuit/short circuit to ground, EVAP canister vent valve, ECM
P1667 D Reverse inhibit solenoid -circuit malfunction Wiring, reverse inhibit solenoid, ECM
P1667 a Fuel pump, control signal -circuit malfunction Wiring, fuel pump control module, ECM
P1668 Alternator ‘L’ terminal -circuit malfunction Wiring, voltage regulator, alternator, ECM
P1670 Engine control module (ECM), quad driver/output driver -circuit malfunction Wiring, ECM controlled components, ECM liJ
P1671 Malfunction indicator lamp (MIL) -circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, MIL, ECM
P1672 Engine oil level ‘low’ warning lamp, control signal -circuit malfunction Wiring short circuit to ground, engine oil level,ECM
P1673 Engine coolant ‘hot’ warning lamp, control signal -circuit malfunction Wiring, instrument panel, cooling system, 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) -malfunction Engine control module (ECM)
P1681 Engine control module (ECM) -malfunction Engine control module (ECM)
P1682 Engine control module (ECM) -ignition power supply less than 10 V Wiring, ECM
P1683 Engine control module (ECM) -malfunction Engine control module (ECM)
P1689 Traction control system (TCS), delivered torque signal -malfunction Wiring, poor connections, ECM
P1750 Torque converter clutch (TCC)solenoid/transmission shift control valve/transmission pressure control solenoid -circuit malfunction Wiring, TCC solenoid/transmission shift control valve/transmission pressure control solenoid, TCM, ECM
P1810 Transmission fluid pressure (TFP) switch -manual valve position Fluid level low, wiring, selector lever linkageincorrectly adjusted, ECM
P1811 Shift time too long -adaptation limit reached Fluid level low, transmission mechanical fault
P1814 Torque converter clutch (TCC) -over-stressed Fluid level low, fluid condition, transmission mechanical fault
P1815 Transmission fluid pressure (TFP) switch -invalidgear selection Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECM
P1816 Transmission fluid pressure (TFP) switch-invalidgear selection Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECM
P1817 Transmission fluid pressure (TFP) switch -invalidgear selection Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECM
P1818 Transmission fluid pressure (TFP) switch -invalidgear selection Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECM
P1819 Transmission range (TR) switch, signals ‘AIS/C &P’ -signal variation Wiring, TR switch
P1820 Transmission range (TR) switch, signal ‘A’ voltage low Wiring short to ground, TR switch
P1822 Transmission range (TR) switch, signal’S’ voltage high Wiring, TR switch
P1823 Transmission range (TR) switch, signal ‘P’ voltage low Wiring short to ground, TR switch
P1825 Transmission range (TR) switch, signals ‘AIS/C &P’ incorrect signal Wiring, TR switch
P1826 Transmission range (TR) switch, signal ‘C’voltage high Wiring, TR switch
P1860 Torque converter clutch (TCC) solenoid -circuitmalfunction Wiring open circuit/short circuit to ground, TCC solenoid, ECM
P1870 Torque converter clutch (TCC) -slip speed excessive Transmission fluid level, wiring, TCC solenoid, ECM
P1887 Torque converter clutch (TCC) release switch -circuit malfunction Wiring open circuit, TCC solenoid release switch, ECM
P1915 Transmission range (TR) switch, signals ‘AIS/C &P’ -incorrect signal, while cranking Wiring, TR switch
P3401 Cylinder cut-out solenoid, cylinder 1 malfunction Wiring, cylinder cut-out solenoid, mechanical fault, ECM
P3425 Cylinder cut-out solenoid, cylinder 4 malfunction Wiring, cylinder cut-out solenoid, mechanical fault, ECM
P3441 Cylinder cut-out solenoid, cylinder 6 malfunction Wiring, cylinder cut-out solenoid, mechanical fault, ECM
P3449 Cylinder cut-out solenoid, cylinder 7 malfunction Wiring, cylinder cut-out solenoid, mechanical fault, ECM
U1000 CAN data bus -communication malfunction Wiring, BCM, ECM, ABS/TCS, instrumentation control module, SOM
U1001 CAN data bus -loss of serial communication Wiring, BCM, ECM, instrumentation controlmodule, SOM
U1016 CAN data bus, engine control module(ECM)/antilock brake system (ABS)/traction control system (TCS)/instrumentation controlmodule/diagnostic control module -loss of serialcommunication Wiring, poor connections, ECM, ABS/TCS, diagnostic control module, instrumentation control module
U1254 CAN data bus -loss of serial communication Wiring, BCM, ECM, instrumentation control module, SOM
U1255 CAN data bus -communication malfunction Wiring, BCM, ECM, ABS/TCS, instrumentation control module, SOM
U1300 CAN data bus -signal low Wiring
U1301 CAN data bus -signal high Wiring
U1304 CAN data bus -communication malfunction withABSITCS Wiring, ABS/TCS, ECM
U1305 CAN data bus -signal high or low Wiring
U1500 Vehicle communication interface module (VCIM)-malfunction VCIM
U1650 CAN data bus -communication malfunction withABSfTCS Wiring, steering angle sensor, ABS/TCS
U1651 CAN data bus -communication malfunction withABSITCS Wiring, steering angle sensor, ABS/TCS