Chevrolet Astro/Blazer – Camaro/Caprice – Camaro/Caprice – Corvette – Express – Metro – Silverado/Suburban – S10 Pickup – Tahoe – Tracker OBD1 Codes

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