OBDII Hummer Code Definitions.
Be sure to double check the codes. Anything P1000 to P1999 or P3000 to P3400 will be Manufacturer specific and may not match the ones listed here. Check specific manufacturer pages on the site, as some of them, we list the OBD2 codes on those pages for those specific vehicles.
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| Hummer Codes | ||
|---|---|---|
| Trouble Code | Fault Location | Probable Cause |
| P1101 | Intake airflow -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 voltagelow, intermittent | Wiring short circuit to ground, poor connections |
| P1111 | Intake air temperature (lAT) 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 |
| P1125 | Accelerator pedal position (APP) sensor 1/2 signal malfunction | Wiring, APP sensor, ECM |
| P1133 | Heated oxygen sensor (H02S) 1, bank 1 insufficient switching | Wiring, exhaust system leaking, H02S |
| P1134 | Heated oxygen sensor (H02S) 1, bank 1 slow response | Wiring, oxygen sensor heater, exhaust system leaking, 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 |
| 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 |
| P1255 | Fuel pump control module -driver over- temperature | Fuel pump control module |
| P1380 | Antilock brake system (ABS)/traction control system (TCS), rough road signal to ECM -malfunction | ABS trouble code(s) stored |
| P1381 | Antilock brake system (ABS)/traction control system (TCS), rough road signal to ECM -no communication | Wiring, poor connections, ABS | P1400 – P1499 (Emission control) |
| 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 |
| 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 |
| P1518 | Throttle control module/engine control module (ECM) -communication malfunction | Wiring, throttle control module, ECM | P1600 – P1699 (ECM – computer output circuit) |
| P1600 | Engine control module (ECM) -malfunction | Engine control module (ECM) |
| P1621 | Engine control module (ECM) memory performance | ECM |
| P1627 | Engine control module (ECM) -malfunction | Engine control module (ECM) |
| P1637 | Altemator ‘L’ terminal -circuit malfunction | Wiring open circuit/short circuit to ground, alternator, battery temperature sensor, ECM |
| P1638 | Altemator ‘F’ terminal -circuit malfunction | Wiring open circuit/short circuit to ground, alternator, ECM |
| P1680 | Engine control module (ECM) -malfunction | Engine control module (ECM) |
| P1681 | Engine control module (ECM) -malfunction | Engine control module (ECM) |
| P1682 | Throttle control module/engine control module (ECM) -ignition power supply variation | Wiring, ECM |
| P1683 | Engine control module (ECM) -malfunction | Engine control module (ECM) |
| P1810 | Transmission fluid pressure (TFP) switch -manual valve position | Fluid level low, wiring, selector lever linkage incorrectly adjusted, ECMITCM |
| P1815 | Transmission fluid pressure (TFP) switch invalid gear selection | Wiring, selector lever linkage incorrectly adjusted, TFP switch, ECM |
| P1816 | Transmission fluid pressure (TFP) switch -invalidgear selection | Wiring, selector lever linkage incorrectly adjusted,TFP switch, ECMITCM |
| P1860 | Torque converter clutch (TCC) solenoid, pulse width modulation (PWM) -circuit malfunction | Wiring open circuit/short circuit to ground, TCCsolenoid, ECM |
| P1875 | Transmission, 4WD low selection signal -circuit malfunction | Wiring, transmission, four wheel drive control module, ECM |