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Model Year Engine identification System
Astro/Blazer 4.3L 1996-05 VIN  position 8 =  W/X GM
Camaro/Caprice 3.8/5.7L 1995-02 VIN  position 8 = G/K/P GM
C/K Pickup 4.3/5.0/5.7/7.4L 1996-00 VIN  position 8 = J/M/R/W/X GM
Corvette 5.7/S.0/S.2/7.0L  (OBO-II) 1994-09 VIN  position 8 =  E/G/P/RIS/U/W/Y GM
Express 4.3/5.0/5.7/7.4/8.1 L 1996-07 VIN  position 8 = G/J/M/R/W/X GM
Express 4.8/5.3/6.0L 2003-09 VIN position 8 = 2/4/C/K/T/U/V/W GM
Express 6.6L Diesel 2004-09 LLY/LMM GM
Metro 1.0/1.3L 1998-01 VIN  position 8 = 2/6 GM
Silverado/Suburban 4.3/4.S/5.3/5.7/6.0/7.4/8.1L 1996-09 VIN position 8 = 3/5/0/B/C/G/J/K/N/T/U/W/X/Y/Z GM
Silverado S.SL Turbo Diesel 2001-09 VIN  position 8 =  1/2 GM
S10 Pickup 2.2/4.3L 1996-05 VIN  position 8 = W/X/4/5 GM
Tahoe 4.8/5.3/5.7L 1996-06 VIN  position 8 = R/T/V/Z GM
Tracker 1.6/2.0/2.5L 1998-04 VIN  position 8 = 1/6/C 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
P1093 Fuel rail pressure (FRP) sensor, command/actualfuel pressure -signal variation Wiring, poor connections, FRP sensor
P1094 Fuel rail pressure (FRP) sensor -signal out ofrange Wiring, poor connections, FRP sensor
P1101 Intake air flow -incorrect Wiring, mechanical fault, engine coolant temperature (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) sensor voltage high, intermittent Wiring open circuit/short circuit to positive, poor connections
P1107 Manifold absolute pressure (MAP) sensor voltagelow, intermittent Wiring short circuit to ground, poor connections
P1108 Manifold absolute pressure (MAP) sensor voltage high Wiring open circuit/short circuit to voltage, manifold absolute pressure (MAP) sensor, exhaust gas recirculation (EGR) valve, restricted exhaust system, ECM
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) sensor voltagelow, intermittent Wiring short circuit to ground, poor connections
P1115 Engine coolant temperature (ECT) sensor voltage high, intermittent Wiring open circuit/short to positive, poor connections
P1120 Throttle motor position sensor 1 -circuit malfunction 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
P1132 Heated oxygen sensor (H02S) 1, bank 1 signal circuit shorted to heater circuit Wiring, H02S, 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, 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, H02S
P1152 Heated oxygen sensor (H02S) 1, bank 2 signal circuit shorted to heater circuit Wiring, H02S, ECM
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 slowresponse Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1158 Heated oxygen sensor (H02S) 2, bank 2 -not switching, fuel trim (FT) rich mixture Wiring, exhaust system leaking, H02S
P1171 Fuel system -lean during acceleration Fuel filter, fuel pump, H02S, injectors
P1172 Fuel level sensors, primary & secondary sensor no fuel level change during fuel transfer from secondary 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) 1, bank 2 mixture variation between cylinders Intake/exhaust leak/blockage, mechanical fault, ignition control, H02S
P1187 Engine oil temperature (EOT) sensor -voltage low Wiring open circuit/short circuit to ground, EOT sensor, ECM
P1188 Engine oil temperature (EOT) sensor -voltage high Wiring open circuit/short circuit to positive, EOT sensor, ECM
P1191 Intake manifold system ,-air leak Intake hose pipe connections, EGR system, ECM
P1220 0 Injector control, circuit monitor -malfunction Wiring, injector, ECM
P1220 fJ 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
P1223 Injector 1 -circuit malfunction Wiring, injector, FICM
P1224 Injector 1 -circuit malfunction Wiring, injector, ECM
P1226 Injector 2 -circuit malfunction Wiring, injector, FICM
P1227 Injector 2 -circuit malfunction Wiring, injector, ECM
P1229 Injector 3 -circuit malfunction Wiring, injector, FICM
P122A Injector 3 -circuit malfunction Wiring, injector, ECM
P1232 Injector 4 -circuit malfunction Wiring, injector, FICM
P1233 Injector 4 -circuit malfunction Wiring, injector, ECM
P1235 Injector 5 -circuit malfunction Wiring, injector, FICM
P1236 Injector 5 -circuit malfunction Wiring, injector, ECM
P1238 Injector 6 -circuit malfunction Wiring, injector, FICM
P1239 Injector 6 -circuit malfunction Wiring, injector, ECM
P1241 Injector 7 -circuit malfunction Wiring, injector, FICM
P1242 Injector 7 -circuit malfunction Wiring, injector, ECM
P1244 Injector 8 -circuit malfunction Wiring, injector, FICM
P1247 Injector 8 -circuit malfunction Wiring, injector, ECM
P1250 Intake manifold heater -circuit malfunction Wiring, intake manifold heater, intake manifold heater relay
P1255 Fuel pump control module -driver over-temperature Fuel pump control module
P1258 Engine overheating Cooling system, ECT sensor
P1261 Injectors 1, 4, 6 & 7 -high voltage Wiring, injector(s), ECM, FICM
P1262 Injectors 2, 3, 5 & 8 -high voltage Wiring, injector(s), ECM, FICM
P1270 Engine control module (ECM), APP sensor signal-analogue/digital process malfunction Engine control module (ECM)
P1271 Accelerator pedal position (APP) sensor 1/2signal variation Wiring, APP sensor, ECM
P1272 Accelerator pedal position (APP) sensor 2/3 -signal variation Wiring, APP sensor, ECM
P1273 Accelerator pedal position (APP) sensor 1/3 –signal variation Wiring, APP sensor, ECM
P1275 Accelerator pedal position (APP) sensor 1 circuit malfunction Wiring, APP sensor, ECM
P1276 Accelerator pedal position (APP) sensor 1 range performance Wiring, APP sensor, ECM
P1277 Accelerator pedal position (APP) sensor 1 voltage low Wiring, APP sensor, ECM
P1278 Accelerator pedal position (APP) sensor 1voltage high 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
P1282 Accelerator pedal position (APP) sensor 2voltage low Wiring, APP sensor, ECM
P1283 Accelerator pedal position (APP) sensor 2voltage high Wiring, APP sensor, ECM
P1285 Accelerator pedal position (APP) sensor 3 circuit malfunction Wiring, APP sensor, ECM
P1286 P1287 Accelerator pedal position (APP) sensor 3 range performance Accelerator pedal position (APP)sensor 3 voltage low Wiring, APP sensor, ECM Wiring, APP sensor, ECM
P1288 Accelerator pedal position (APP) sensor 3voltage high Wiring, APP sensor, ECM
P1293 Fuel injection control module -circuit malfunction bank 1 Fuel injection control module
P1294 Fuel injection control module -circuit malfunction bank 2 Fuel injection control module
P1295 Fuel injection control module -circuit malfunction bank 1 Fuel injection control module
P1296 Fuel injection control module -circuit malfunction bank 2 Fuel injection control module
P129D Ignition switch circu it 1 -low voltage Wiring, fuel pump flow control module (FPMC),fuel pump flow control module (FPCM) relay
P129F Fuel pump speed signal -incorrect Wiring, fuel pump flow control module (FPMC), fuel pump flow control module (FPCM) relay
P12AO Fuel pump speed circuit -low duty cycle Wiring, fuel pump flow control module (FPMC),fuel pump flow control module (FPCM) relay
P12A1 Fuel pump speed circuit -high duty cycle Wiring, fuel pump flow control module (FPMC), fuel pump flow control module (FPCM) relay
P12A2 Fuel pump speed circuit -performance Wiring, fuel pump flow control module (FPMC),fuel pump flow control module (FPCM) relay
P12A4 Fuel pump enable circuit voltage -low Wiring, fuel pump flow control module (FPMC), fuel pump flow control module (FPCM) relay
P12A5 Fuel pump enable circuit voltage -high Wiring, fuel pump flow control module (FPMC),fuel pump flow control module (FPCM) relay
P12A6 Fuel pump enable circuit voltage -performance Wiring, fuel pump flow control module (FPMC),fuel pump flow control module (FPCM) relay
P12A7 Fuel pump phase U-V-W circuit Wiring, fuel pump flow control module (FPCM) relay
P1336 Crankshaft position (CKP) sensor -variation not leamed 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 system, bypass circuit -circuit malfunction Wiring, poor connections, ICM, ECM
P1351 Ignition control system, coil -voltage high Wiring open circuit, ICM, ECM
P1352 Ignition control system, bypass circuit voltage high Wiring open circuit, ICM, ECM
P1361 Ignition control system, ignition control (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,lCM
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 controlsystem (TCS). rough road signal to engine control module (ECM) -malfunction ASS 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, ABS
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
P1408 Manifold absolute pressure (MAP) sensor voltageout range Wiring, poor connections, MAP sensor, ECM
P1410 Evaporative emission (EVAP) canister purge valve-circuit malfunction Wiring, poor connections, EVAP canister vent valve, ECM
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
P1431 Fuel level sensor -circuit malfunction Wiring, fuel level sensor
P1432 Fuel level sensor low voltage Wiring open circuit, fuel level sensor
P1433 Fuel level sensor -voltage high Wiring short circuit to positive, fuel level sensor
P1441 Evaporative emission (EVAP) system -leakdetected Hose connection(s), EVAP canister, EVAP canister purge valve
P1442 Evaporative emission (EVAP) system vacuum switch -circuit malfunction Hoses blockedlleaking, wiring, EVAP canister, ECM
P1448 Diesel particulate filter (DPF) regeneration frequency -too low Hoses blockedlleaking, exhaust, exhaust pressure sensor
P1450 Barometric pressure (BARO) sensor -voltage outof range Wiring, BARO sensor, ECM
P1451 Barometric pressure (BARO) sensor performance range Wiring, poor connections, BARO sensor, ECM
P1500 Ignition switch, cranking signal/system voltage -circuit malfunction Wiring, poor connections, ECM
P1504 Engine control module (ECM). vehicle speed sensor (VSS) output signal -circuit malfunction Wiring, poor connections, ABS, ECM
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
P1510 Engine control module (ECM), KAM supply voltage -circuit malfunction Wiring, poor connections, ECM
P1514 Throttle control unit, intake air flow -excessive Throttle control unit, MAP sensor, CMP sensor signal, ECM
P1515 Throttle command/actual throttle position -signal variation 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
P1519 Throttle motor position sensor 1 -signal malfunction Throttle control module
P1520 Park/neutral position (PNP) switch -circuit malfunction Wiring short circuit to ground, PNP switch incorrectly adjusted
P1523 Throttle control unit, closed throttle position -performance Throttle valve movement restricted, throttle control unit
P1530 Ignition timing adjustment connector Wiring short circuit to ground, connector short to ground
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
P154A Intake air heater -feedback circuit Wiring, glow plug control module, intake air heater
P154B Intake air heater -voltage signal circuit Wiring, glow plug control module, intake air heater
P154C Intake air heater -current signal circuit Wiring, glow plug control module, intake air heater
P154D Intake air heater -temperature signal circuit Wiring, glow plug control module, intake air heater
P1550 System voltage low Wiring, battery, alternator
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
P1574 Brake pedal position (BPP) switch, voltage high Wiring, ABS
P1575 Brake pedal position (BPP) .switch. extended travel contacts -voltage high Wiring, ABS
P1586 Cruise control system. brake switch 2 -circuit malfunction Wiring, poor connections, BPP switch
P1600 Engine control module (ECM) -malfunction ECM
P160C Glow plug control module engine calibration information -not programmed Program fuel injection flow rate
P1601 CAN data bus, engine control module (ECM)/antilock brake system (ABS)/tractioncontrol system (TCS)/instrumentation control module/diagnostic control module some communication lost Wiring, poor connections, ECM, ABSITCS, 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
P1621 Engine control module (ECM) -malfunction ECM
P1624 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 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 not completed
P1631 Engine control module (ECM) -incorrect immobilizer code Incorrect key, immobilizer code not programmed
P1632 Engine control module (ECM) -fuel disable signal received Fuses, BCM, immobilizer code
P1635 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, TP sensor, MAP sensor, EGR valve position sensor, FTP sensor, ECM
P1635 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, APP sensor 1/3, engine oil pressure sensor, fuel rail pressure 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 supplyvoltage -circuit malfunction Wiring, poor connections, fuel tank level sensor, ECM
P1639 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, FTP sensor, ECM
P1639 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring, poor connections, FTP sensor, AlC refrigerant 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 supplyvoltage -circuit malfunction Wiring, poor connections, APP sensor, TC boostpressure sensor, BARO sensor, EGR vacuum sensor, ECM
P1641 Malfunction indicator lamp (MIL) -circuit malfunction Wiring, poor connections, MIL, ECM
P1641 Engine coolant blower motor relay 1 -circuit malfunction Wiring, engine coolant blower motor relay, ECM
P1642 Engine coolant blower motor relay 2 & 3 circuit malfunction Wiring. engine coolant blower motor relay(s),ECM
P1643 Engine speed (RPM), engine control module (ECM) output signal -circuit malfunction Wiring, tachometer, ECM
P1643 Glow plug warning lamp -circuit malfunction Wiring, glow plug warning lamp, ECM
P1644 Traction control system (TCS), delivered torque signal -malfunction Wiring, poor connections, ECM
P1651 Engine coolant blower motor relay 1 -circuit malfunction Wiring, engine coolant blower motor relay, ECM
P1652 Engine control module (ECM), vehicle speed sensor (VSS) output signal -circuit malfunction Wiring, poor connections, ECM
P1652 Engine control module (ECM), firm suspensionrequest Signal -circuit malfunction Wiring, poor connections, suspension control module, ECM
P1652 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 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 purgevalve -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
P1658 Fuel injector control module (FICM) -malfunction FICM
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 -circuitmalfunction Wiring, instrument panel, ECM
P1663 Engine oil life monitor reset switch -circuitmalfunction Wiring short circuit to ground, engine oil life monitor reset switch, 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 Reverse inhibit solenoid -circuit malfunction Wiring, reverse inhibit solenoid, ECM
P1668 Alternator ‘L’ terminal -circuit malfunction Wiring , ECM , voltage regulator , alternator
P166B Intake air heater -over temperature Intake air heater
P166C Intake air heater -resistance Intake air heater
P1671 Malfunction indicator lamp (MIL) -circuitmalfunction Wiring open circuit/short circuit to ground/shortcircuit to positive, MIL, ECM
P1672 Engine oil level ‘low’ warning lamp, control signal-circuit malfunction Wiring short circuit to ground, engine oil level,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 ECM
P1681 Engine control module (ECM) malfunction ECM
P1682 Engine control module (ECM) -ignition powersupply less than 10 V Wiring, ECM
P1683 Engine control module (ECM ) malfunction ECM
P1687 Fuel injector control module (FICM) -stuck on ECM, FICM
P1689 Traction control system (TCS), delivered torque signal -malfunction Wiring, poor connections, ECM
P1740 Cruise control system, overdrive disable signal -voltage low Wiring short to ground, ECM
P1781 Transmission control module (TCM ), malfunctionindicator lamp (MIL) request signal -voltagehigh/low Wiring TCM, ECM
P1810 Transmission gear pressure switch, signal -circuit malfunction Wiring open circuit/short circuit to ground,reverseID1/D21D3/D4 gear pressure switch(es), ECM
P1860 Torque converter clutch (TCC) solenoid, pulse width modulation (PWM ) -circuit malfunction 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
P1875 Transmission, 4WD low selection signal-circuit malfunction Wiring, transmission, four wheel drive control module, ECM
U1000 CAN data bus -communication malfunction Wiring, SCM, ECM, instrumentation controlmodule,SDM
U1026 Transmission control module (TCM)/four wheel drive control module, CAN data buscommunication malfunction Wiring, SCM
U1041 Antilock brake system (ABS)/traction control system (TCS), CAN data bus -communication malfunction Wiring, ABSITCS trouble codes stored
U1064 Body control module (BCM), CAN data bus -communication malfunction Wiring, SCM
U1192 Engine control module (ECM)/immobilizer control module, CAN data bus -Signal malfunction Wiring, immobilizer control module, ECM
U1193 Engine control module (ECM)/immobilizer control module, CAN data bus -signal malfunction Wiring, immobilizer control module, ECM
U1300 CAN data bus -signal low Wiring
U1301 CAN data bus -Signal high Wiring
U1800 Engine control module (ECM)/fuel injector control module (FICM), CAN data bus -communication malfunction Wiring, FICM, ECM
U1802 Fuel pump control module (FPCM)communication malfunction Wiring, fuel pump control module (FPCM), fuel pump control module (FPCM) relay
U2104 Engine control module (ECM)/transmissioncontrol module (TCM)/fuel injector control module (FICM), CAN data bus communication malfunction Wiring, TCM, FICM, ECM
U2106 Engine control module (ECM)/transmission control module (TCM)/fuel injector control module (FICM), CAN data bus communication malfunction Wiring, TCM, ECM, FICM