GMC Arcadia – Canyon – Envoy – G-Series – Jimmy/Safari – Savana – Sierra/C/K – Sonoma – Suburban/Yukon/Denali OBD1 Codes

Model	Year	Engine identification	System
Acadia 3.6L	2008-09	VIN position 8 = 7/V	GM
Canyon 2.8/2.9/3.5/3.7/5.3L	2004-09	VIN position 8 = 6/8/9/E/L	GM
Envoy 4.2/4.3/5.3L	1999-09	VIN position 8 = M/P/S/W	GM
G-Series 4.3/5.7/7.4L	1996	VIN position 8 = K/N/Z	GM
Jimmy 4.3L- with GM vehicle control module (VCM)	1995	VIN position 8 = W, Z	GM
JimmylSafari 4.3L	1996-05	VIN position 8 = W/X	GM
Savana 4.3/4.8/5.0/5.3/5.7/6.0/7.4/8.1 L	1996-09	VIN position 8 = G/J/M/R/T/V/U/W/X	GM
Sierra/C/K Pickup 4.3/4.8/5.0/5.3/5.7/6.0/6.2/7 .4/8.1 L	1996-09	VIN position 8 = 3/5/8/B/G/J/M/N/R/T/U/V/W/X/Y/Z	GM
Sonoma 2.2/4.3L	1996-04	VIN position 8 = W/X/4	GM
Sonoma 4.3L – with GM vehicle control module (VCM)	1995	VIN position 8 = W/Z	GM
SuburbanlYukon/Denali 4.S/5.3/5.7/6.0/6.2/7.4/8.1L	1996-09	VIN position 8 = 0/2/3/5/8/C/G/J/K/N/O/R/T/U/V/Y/Z	GM

General information

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) 1.

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 airflow -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 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 variation	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 voltagelow	Wiring, exhaust system leaking, H02S
P1138	Heated oxygen sensor (H02S) 2, bank 1 voltage high	Wiring, H02S
P1153	Heated oxygen sensor (H02S) 1, bank 2insufficient 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 & secondary sensor no fuel level change during fuel transfer from secondary to primary tank	Wiring, secondary fuel pump/relay, fuel level sensors
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
P1220	Throttle motor position sensor 1 -circuit malfunction	Wiring, throttle control module
P1221 0	Fuel pump, run signal -circuit malfunction	Wiring, engine oil pressure switch, fuel pump relay
P1221 f)	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
P1255	Fuel pump control module -driver over-temperature	Fuel pump control module
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 circuitmalfunction	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 (CKP) sensor -variation not leamed	Learning procedure not performed
P1345	Crankshaft position (CKP) sensor/camshaftposition (CMP) sensor -signal variation	Wiring, CKP sensor, CMP sensor
P1351	Ignition control system, coil -voltage high	Wiring open circuit, ICM, ECM
P1361	Ignition control system, IC circuit -voltage low	Wiring, circuit short circuit to ground, poor connections, ICM, ECM
P1380	Antilock brake system (ABS)/traction controlsystem (TCS), rough road signal to ECM -malfunction	ABSfTCS trouble code(s) stored
P1381	Antilock brake system (ABS)/traction control system (TCS), rough road signal to ECM -nocommunication	Wiring, poor connections, ABSfTCS
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
P1415	Secondary air injection (AIR) system, bank 1	Wiring, hoses blocked/leaking. AIR valve
P1416	Secondary air injection (AIR) system, bank 2	Wiring. hoses blockedfleaking, 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 -high voltage	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 blockedfleaking, 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 sensor
P1504	Engine control module (ECM), vehicle speed sensor (VSS) output signal -circuit malfunction	Wiring, poor connections, ASS, 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, ABSITCS
P1574	Brake pedal position (BPP) switch, voltage high	Wiring, ABS
P1600	Engine control module (ECM) -malfunction	ECM
P1601	CAN data bus, engine control module (ECM)/ anti lock brake system (ABS)/traction control 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) -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
P1630	Engine control module (ECM), immobilizer code -leaming mode	ECM immobilizer code programming not completed
P1631	Engine control module (ECM) -incorrectimmobilizer code	Incorrect key, immobilizer code not programmed
P1632 [1]	System voltage low	Wiring, battery, alternator
P1632 [3]	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 -voltage low	Wiring open circuit, ECM
P1635	Engine control module (ECM), sensor supply voltage -circuit malfunction	Wiring, poor connections, TP sensor, MAP sensor, EGR valve position sensor, ECM
P1637	Alternator warning lamp, control signal -circuit malfunction	Wiring, instrument panel, ECM
P1638	Alternator ‘F’ terminal -circu it malfunction	Wiring open circuit/short circuit to ground,alternator, ECM
P1639	Engine control module (ECM), sensor supply voltage -circuit malfunction	Wiring, poor connections, FTP sensor, ECM
P1644	Traction control system (TCS), delivered torque signal -malfunction	Wiring, poor connections, ECM
P1665	Fuel level sensor -signal malfunction	Wiring short circuit to positive, fuel level sensor
P1668	Alternator ‘l’ terminal -circuit malfunction	Wiring, voltage regulator, alternator, 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
P1688	Engine control module (ECM), torque reduction signal -out of range	Wiring TCM, ECM
P1689	Traction control system (TCS), delivered torquesignal -malfunction	Wiring, poor connections, ECM
P16F3	Engine control module -redundant memoryperformance	Wiring, ECM
P1779	Engine control module (ECM), torque reduction signal -out of range	Wiring TCM, ECM
P1781	Transmission control module (TCM), MIL requestsignal -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	Transmission mechanical fault, towing weight limit exceeded
P1815	Transmission fluid pressure (TFP) switch -invalid gear selection	Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECMITCM
P1816	Transmission fluid pressure (TFP) switch -invalid gear selection	Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECMITCM
P1860	Torque converter clutch (TCC) solenoid, pulsewidth 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 -circuitmalfunction	Wiring, control solenoid, ECM
P3400	Cylinder cut-out system -malfunction	Wiring, intake system leaking, mechanical fault, MAF sensor, MAP sensor, TP sensor, 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
U1026	Transmission control module (TCM)/four wheeldrive control module, CAN data bus -communication malfunction	Wiring, BCM
U1041	Antilock brake system (ABS)/traction controlsystem (TCS), CAN data bus -communicationmalfunction	Wiring, ABSITCS control module
U1064	Body control module (BCM)/immobilizer controlmodule, CAN data bus -communication malfunction	Wiring, BCM, immobilizer control module
U1192	Engine control module (ECM)limmobilizer control module, CAN data bus -signal malfunction	Wiring, immobilizer control module, ECM
U1193	Engine control module (ECM)limmobilizer control module, CAN data bus -signal malfunction	Wiring, immobilizer control module, ECM