GM GM Envoy, Jimmy, Rally, Safari, Savana, Sierra, Sonoma, Vandura, Yukon Trouble Code Info

GM

Various Models
Scan Code Fault Location Probable Cause
POOOO-P0999 Refer to OBD-II trouble code table
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 (ECT) sensor -voltage low, 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
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, H02S
P1138 Heated oxygen sensor (H02S) 2, bank 1 -voltage high Wiring, H02S
P1153 Heated oxygen sensor (H02S) 1, bank 2 -insufficient switching Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1154 Heated oxygen sensor (H02S) 1, bank 2 -slow response Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1171 Fuel system -lean during acceleration Fuel filter, fuel pump, H02S, injectors
P1172 Fuel level sensors, primary and secondary -no fuel level change during fuel transfer from secondary to primary tank Wiring, fuel pump relays, secondary fuel pump, fuel level sensors, ECM
P1221 (Model Year 1995) Fuel pump, run signal -circuit malfunction Wiring, engine oil pressure switch, fuel pump relay
P1221 (Model Years 2001-02) Throttle motor position sensor 2 -circuit malfunction Wiring, throttle control module
P1222 Fuel pump, run signal – circuit malfunction Wiring, engine oil pressure switch, fuel pump relay
P1258 Engine overheating Cooling system, ECT sensor
P1271 Accelerator pedal position (APP) sensor 1/2 -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
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 -circuit malfunction Wiring, APP sensor, ECM
P1286 Accelerator pedal position (APP) sensor 3 -range performance Wiring, APP sensor, ECM
P1336 Crankshaft position sensor (CKP) -variation not learned Learning procedure not performed
P1345 Crankshaft position sensor (CKP)/camshaft position sensor (CMP) -signal variation CKP sensor, distributor/camshaft alignment, mechanical fault
P1351 Ignition control system, coil -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
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, ABS
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
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, secondary -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 -leak detected Hose connection(s), EVAP canister, EVAP canister purge valve
P1442 Evaporative emission (EVAP) system vacuum switch -circuit malfunction Hoses blocked/leaking, wiring, EVAP canister, ECM
P1481 Engine coolant fan speed sensor – signal loss Wiring, engine coolant fan speed sensor
P1482 Engine coolant fan clutch solenoid – circuit malfunction Wiring, engine coolant fan clutch solenoid, engine coolant fan clutch solenoid relay
P1484 Engine coolant fan speed/engine speed – signal variation Wiring, engine coolant fan clutch, engine coolant fan speed
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
P1512 Throttle command/actual throttle position – signals out of range Wiring, throttle valve sticking, throttle control module
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
P1520 Park/neutral position (PNP) switch -circuit malfunction Wiring short circuit to ground, PNP switch incorrectly adjusted
P1523 Throttle control unit, throttle position during battery saving mode Throttle valve movement restricted, throttle control unit, ECM
P1571 Traction control system (TCS), torque request signal -malfunction Wiring, poor connections, ABS/TCS
P1574 Brake pedal position switch (BPP), voltage high Wiring, ABS
P1600 Engine control module (ECM) -malfunction ECM
P1601 CAN data bus, engine control module (ECM)I antilock brake system (ABS)/traction control system (TCS)/instrumentation control modulel 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
P1626 Engine control module (ECM) -fuel enable signal lost Wiring, poor connections, immobilizer control module, ECM
P1627 Engine control module (ECM) -malfunction 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 (Model Year 1995) Engine control module (ECM) -fuel disable signal received Fuses, SCM, immobilizer code
P1632 (Model Years 1998-2002) Engine control module (ECM) -fuel disable signal received Fuses, SCM, 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
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, fuel tank level sensor, ECM
P1644 Traction control system (TCS), delivered torque signal -malfunction Wiring, poor connections, ECM
P1680 Engine control module (ECM) -malfunction ECM
P1681 Engine control module (ECM) -malfunction ECM
P1683 Engine control module (ECM) -malfunction ECM
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
P1779 Engine control module (ECM), torque reduction signal – out of range Wiring TCM, ECM
P1781 Transmission control module (TCM), malfunction indicator lamp (MIL) request signal -voltage high/low Wiring TCM, 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
P1812 transmission fluid temperature (TFT) – high Tramsmission mechanical fault, towing weight limit exceeded
P1860 Torque converter clutch (TCC) solenoid, pulse width modulation (PWM) -circuit malfunction Wiring open circuit/short circuit to ground, TCC solenoid, ECM
P1864 Torque converter clutch (TCC) solenoid – 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
P1886 Transmission 3rd-2nd control solenoid – circuit malfunction Wiring, control solenoid, ECM
U1000 CAN data bus -communication malfunction Wiring, BCM, ECM, instrumentation control module, SOM
U1026 Transmission control module (TCM)/four wheel drive control module, CAN data bus communication malfunction Wiring, BCM
U1041 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
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