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Model

Engine  identification: Year:

System

Avalanche 5.3/6.0/8.1 L VIN  position 8 =  3/0/G/K/T/Y 2002-09 GM
Aveo 1.6L VIN  position 8 =  6 2004-09 GM
Colorado 2.8/3.5L VIN  position 8 =  8/6 2004-06 GM
Colorado 2.9/3.6/5.7L VIN  position 8 =  9/E/L 2007-09 GM
Impala 3.4/3.8L VIN  position 8 =  E/K/1 2000-05 GM
Malibu 2.2/2.4/3.5/3.6L VIN  position 8 =  5/7/B/F/N/8 2004-09 GM
Malibu 2.4/3.1 L VIN  position 8 =  J/M/T 1997-03 GM
Prizm 1.BL VIN  position 8 =  8 1998-02 GM
SSR 5.3/6.0L VIN  position 8 =  H/P 2003-07 GM
Trailblazer 4.2/5.3/6.0L VIN  position 8 =  H/M/P/S 2002-09 GM
Venture 3.4L VIN  position 8 =  E 1997-04 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.

Accessing

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

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 OBO-II trouble code tables
P1101 Intake air flow -incorrect Wiring, mechanical fault, engine coolant temperature (EeT) 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) sensor voltage high, intermittent Wiring open circuit/short circuit to positive, poor connections
P1107 Manifold absolute pressure (MAP) sensor voltage 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 (EeT) sensor voltagelow, intermittent Wiring short circuit to ground, poor connections
P1115 Engine coolant temperature (EeT) sensor voltage high, intermittent Wiring open circuit/short to positive, poor connections
P1116 Engine coolant temperature (EeT) sensor circuit malfunction Wiring, ECT sensor, ECM
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 1/2/3 -signal malfunction Wiring, APP sensor, ECM
P1133 Oxygen sensor (02S)/heated oxygen sensor(H02S) 1, bank 1 -insufficient switching Wiring, exhaust system leaking, 025/H025
P1134 Heated oxygen sensor (H02S) 1, bank 1 slow response Wiring, oxygen sensor heater, exhaust system leaking, H025
P1137 Heated oxygen sensor (H02S) 2, bank 1 voltage low Wiring, exhaust system leaking, H025
P1138 Heated oxygen sensor (H02S) 2, bank 1 voltage high Wiring, H025
P1153 Heated oxygen sensor (H02S) 1, bank 2insufficient switching Wiring, oxygen sensor heater, exhaust system leaking, H025
P1154 Heated oxygen sensor (H02S) 1, bank 2 slow response Wiring, oxygen sensor heater, exhaust system leaking, H025
P1166 Heated oxygen sensor (H02S) 2, bank 1 voltage low Wiring, exhaust system leaking, H025
P1171 Fuel system -lean during acceleration Fuel filter, fuel pump, H025, injectors
P1172 Fuel level sensors, primary & secondary sensorno fuel level change during fuel transfer fromsecondary to primary tank Wiring, fuel pump relays, secondary fuel pump, fuel level sensors, ECM
P1174 Heated oxygen sensor (H02S) 1, bank 1 mixture variation between cylinders Intake/exhaust leak/blockage, mechanical fault,ignition control, H02S
P1175 Heated oxygen sensor (H02S) 2, bank 2 mixturevariation between cylinders Intake/exhaust leak/blockage, mechanical fault,ignition control, H02S
P1189 Engine oil pressure warning switch -circuitmalfunction Wiring open circuit, engine oil pressure warning switch, ECM
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 -signalvariation Wiring, throttle control module
P1255 Fuel pump control module -driver over-temperature Fuel pump control module
P1271 Accelerator pedal position (APP) sensor 1/2 signal 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 circuit malfunction 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
P1300 Ignition coil 1 control -feedback circuit malfunction Wiring, ignition coil 1, ECM
P1305 Ignition coil 2 control -feedback circuitmalfunction Wiring, ignition coil 2, ECM
P1310 Ignition coil 3 control -feedback circuitmalfunction Wiring, ignition coil 3, ECM
P1315 Ignition coil 4 control -feedback circuitmalfunction Wiring, ignition coil 4, ECM
P1335 Crankshaft position (CKP) sensor -circuit malfunction Wiring, CKP sensor, ECM
P1336 Crankshaft position (CKP) sensor -variation notlearned Learning procedure not performed
P1345 Crankshaft position (CKP) sensor/camshaftposition (CMP) sensor -signal variation CKP sensor, distributor/camshaft alignment, mechanical fault
P1346 Camshaft position actuator -circuit malfunction Wiring, mechanical fault, camshaft position actuator, ECM
P1349 Camshaft position actuator -circuit malfunction Wiring, mechanical fault, camshaft position actuator, ECM
P1350 Ignition control system, bypass circuit -circuit malfunction Wiring, poor connections, ICM, ECM
P1351 Ignition control system, coil -voltage high Wiring open circuit, ICM, ECM
P1351 Ignition control module (ICM) -ignition coil 1circuit voltage high Wiring open circuit/short circuit to ground/ short circuit to positive, ICM, ECM
P1352 0 Ignition control system, bypass circuit voltage high Wiring open circuit, ICM, ECM
P1352 Ignition control module (ICM) -ignition coil 2 circuit voltage high Wiring open circuit/short circuit to ground/short circuit to positive, ICM, ECM
P1353 Ignition control module (ICM) -ignition coil 3circuit voltage high Wiring open circuit/short circuit to ground/short circuit to positive, ICM, ECM
P1361 Ignition control system, ignition control (IC) circuit -voltage low Wiring, circuit short circuit to ground, poor connections, ICM, ECM
P1361 Ignition control module (ICM) -ignition coil 1 circuit voltage low Wiring short circuit to ground/positive, bypass circuit short circuit to ground, ICM, ECM
P1362 Ignition control, bypass circuit -voltage low Wiring short circuit to ground, ICM, ECM
P1362 Ignition control module (ICM) -ignition coil 2circuit voltage low Wiring short circuit to ground/positive, bypass circuit short circuit to ground, ICM, ECM
P1363 Ignition control module (ICM) -ignition coil 3 circuit voltage low Wiring short circuit to ground/positive, bypass circuit short circuit to ground, ICM, ECM
P1374 Crankshaft position (CKP) sensor, high to low resolution frequency -signal variation Wiring, wiring routed near spark plug wires, ignition coils arcing/tracking, ICM, ECM
P1380 Antilock brake system (ABS)/traction control system (TCS), rough road signal to engine control module (ECM) -malfunction ABS trouble code(s) stored
P1381 Antilock brake system (ABS)/traction control system (TCS), rough road signal to engine control module (ECM) -no communication Wiring, poor connections, ASS
P1391 Rough road sensor -signal malfunction Wiring, rough road sensor, ECM
P1392 Rough road sensor -voltage low Wiring, rough road sensor, ECM
P1393 Rough road sensor -voltage high Wiring, rough road sensor, ECM
P1396 Rough road sensor -signal malfunction Wiring, rough road sensor, wheel speed sensor, ECM
P1397 Rough road sensor -signal malfunction Wiring, rough road sensor, wheel speed sensor, ABS control module
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 fully closing Wiring, poor connections, EGR valve position sensor, EGR solenoid
P1406 Exhaust gas recirculation (EGR) valve position sensor range performance Wiring, EGR valve tight/sticking, EGR valve position sensor
P1441 Evaporative emission (EVAP) system -leakdetected Hose connection(s), EVAP canister, EVAP canister purge valve
P1442 Evaporative emission (EVAP) system vacuumswitch -circuit malfunction Hoses blockedlleaking, wiring, EVAP canister, ECM
P1483 Engine cooling system -performance Cooling system, ECT sensor, IAT sensor
P1512 Throttle control unit -signal variation Wiring, throttle control unit, ECM
P1514 Throttle control unit, intake air flow -excessive Throttle control unit, MAP sensor, CMP sensor signal, 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/engine control module(ECM) -communication malfunction Wiring, throttle control module, ECM
P1520 Stoplamp switch -circuit malfunction Wiring short to voltage, stoplamp switch, ECM
P1523 Throttle control unit, closed throttle position -performance Throttle valve movement restricted, throttle control unit
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, ABS/TCS
P1573 Engine control module (ECM), anti lock brake system (ABS)/traction control system (TCS)communication -malfunction Wiring, poor connections, ABS control module, ECM
P1585 Cruise control , inhibit output circuit -voltage out of range Wiring, cruise control module, ECM
P1600 Engine control module (ECM) -malfunction ECM
P1600 Engine control module (ECM) -supply voltage Wiring, ECM
P1601 CAN data bus, engine control module (ECM)/antilock brake system (ABS)/tractioncontrol system (TCS)linstrumentation control module/diagnostic control module some communication lost Wiring, poor connections, ECM, ABS/TCS, diagnostic control module, instrumentation control module
P1602 Engine control module (ECM) to antilock brake system (ABS)/traction control system (TCS),CAN data bus -communication failure Wiring, poor connections, ABS control module
P1604 CAN data bus -instrument panel Wiring, BCM trouble code(s) stored
P1605 CAN data bus -AlC Wiring, AlC system trouble code(s) stored
P1610 CAN data bus -body control module (SCM) Wiring, BCM trouble code(s) stored
P161B Throttle motor control module -performance ECM, transmission, AlC compressor, manifold absolute pressure (MAP) sensor hose
P1621 Engine control module (ECM) -malfunction ECM
P1626 Engine control module (ECM) -fuel enable signal lost Wiring, poor connections, immobilizer control module, ECM
P1627 Engine control module (ECM) -malfunction 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 -learning mode ECM immobilizer code programming notcompleted
P1631 Engine control module (ECM) -incorrectimmobilizer code Incorrect key, immobilizer code not programmed
P1632 Engine control module (ECM) -fuel disable signal received Fuses, BCM, immobilizer code
P1633 Engine control module (ECM), ignition supply voltage Fuse, wiring open circuit, ECM
P1634 Engine control module (ECM), ignition supply voltage Fuse, wiring open circuit, ECM
P1635 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, TP sensor, MAPsensor, EGR valve position sensor, FTP sensor, ECM
P1637 Alternator ‘L’ terminal -circuit malfunction Wiring open circuit/short circuit to ground,alternator, battery temperature sensor, ECM
P1638 Alternator ‘F’ terminal -circuit malfunction Wiring open circuit/short circuit to ground,alternator, ECM
P1639 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, AlC refrigerant pressure sensor, ECM
P1639 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, FTP sensor, AlCrefrigerant pressure sensor, ECM
P1639 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, FTP sensor, throttle position (TP) sensor, ECM
P1639 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, MAP sensor sensor, throttle position (TP) sensor 2, accelerator pedalposition (APP) sensor 1, ECM
P1640 Engine control module, output driver 1 supply voltage high Wiring, loose alternator connection, alternator
P1641 Malfunction indicator lamp (MIL) -circuit malfunction Wiring, poor connections, MIL, ECM
P1641 AlC compressor clutch relay -circuit malfunction Wiring open circuit/short circuit to ground, AlC compressor clutch relay, ECM
P1650 Engine control module, output driver 2 supply voltage high Wiring, loose alternator connection, alternator
P1651 Engine coolant blower motor relay 1 -circuit malfunction Wiring, engine coolant blower motor relay, ECM
P1652 Engine coolant blower motor relay 2 & 3 circuitmalfunction Wiring, engine coolant blower motor relay(s), ECM
P1653 Fuel gauge, control signal -circuit malfunction Wiring, ECM
P1653 Engine oil level ‘low’ warning lamp, control signal -circuit malfunction Wiring short circuit to ground, engine oil level, 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
P1656 Camshaft position actuator -circuit malfunction Wiring open circuit/short circuit to ground, camshaft position actuator, ECM
P1660 Engine control module, output driver 3 supplyvoltage high Wiring, loose alternator connection, alternator
P1660 Engine control module, serial input driver module -supply voltage high Wiring short circuit to positive, 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 -circuitmalfunction Wiring, instrument panel, ECM
P1665 Evaporative emission (EVAP) canister vent valve -circuit malfunction Wiring open circuit/short circuit to ground, EVAP canister vent valve, ECM
P1668 Alternator ‘L’ terminal -circuit malfunction Wiring ” ECM , voltage regulator, alternator
P1670 Engine control module, output driver 4 supplyvoltage high Wiring, loose alternator connection, alternator
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 -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, instrument panel, cooling system, ECM
P1675 Evaporative emission (EVAP) canister vent valve -circuit malfunction Wiring, poor connection, 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
P1680 Accelerator pedal position (APP) sensor 2 circuit malfunction Wiring open circuit/short circuit to ground/shortcircuit to positive, APP sensor, ECM
P1681 Engine control module (ECM) malfunction ECM
P1682 Engine control module (ECM) -ignition power supply less than 10 V Wiring, ECM
P1682 Throttle control module/engine control module (ECM) -ignition power supply variation Wiring, ECM
P1683 Engine control module (ECM) -malfunction ECM
P1689 Traction control system (TCS), delivered torque signal -malfunction Wiring, poor connections, ECM
P1810 Transmission gear pressure switch, signal _.circuit malfunction Wiring open circuit/short circuit to ground, reverse/D1/D2/D3/D4 gear pressure switch(es),ECM
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, antilock brake system (ABS)/traction control system (TCS), instrumentation control module, SDM
U1040 Antilock brake system (ABS)/traction control system (TCS), CAN data bus -communication malfunction Wiring, ABS/TCS trouble codes stored
U1064 . Body control module (BCM), CAN data bus -communication malfunction Wiring, BCM