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 CodeFault LocationProbable Cause
P1100 – P1199 (Fuel and air metering)
P1101Intake airflow -incorrectWiring, 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
P1106Manifold absolute pressure (MAP) sensor voltage high, intermittentWiring open circuit/short circuit to positive, poor connections
P1107Manifold absolute pressure (MAP) sensor voltagelow, intermittentWiring short circuit to ground, poor connections
P1111Intake air temperature (lAT) sensor -voltage high, intermittentWiring open circuit/short to positive, poor connections
P1112Intake air temperature (IAT) sensor -voltage low, intermittentWiring short circuit to ground
P1114Engine coolant temperature (ECT) sensor voltage low, intermittentWiring short circuit to ground, poor connections
P1115Engine coolant temperature (ECT) sensor voltage high, intermittentWiring open circuit/short to positive, poor connections
P1125Accelerator pedal position (APP) sensor 1/2 signal malfunctionWiring, APP sensor, ECM
P1133Heated oxygen sensor (H02S) 1, bank 1 insufficient switchingWiring, exhaust system leaking, H02S
P1134Heated oxygen sensor (H02S) 1, bank 1 slow responseWiring, oxygen sensor heater, exhaust system leaking, H02S
P1153Heated oxygen sensor (H02S) 1, bank 2 insufficient switchingWiring, oxygen sensor heater, exhaust system leaking, H02S
P1154Heated oxygen sensor (H02S) 1, bank 2 slow responseWiring, oxygen sensor heater, exhaust system leaking, H02S
P1174Heated oxygen sensor (H02S) 1, bank 1 mixture variation between cylindersIntake/exhaust leak/blockage, mechanical fault, ignition control, H02S
P1175Heated oxygen sensor (H02S) 1, bank 2 mixture variation between cylindersIntake/exhaust leak/blockage, mechanical fault, ignition control, H02S
P1200 – P1299 (Fuel and air metering – injector circuit)
P1255Fuel pump control module -driver over- temperatureFuel pump control module
P1300 – P1399 (Ignition system or misfire)
P1380Antilock brake system (ABS)/traction control system (TCS), rough road signal to ECM -malfunctionABS trouble code(s) stored
P1381Antilock brake system (ABS)/traction control system (TCS), rough road signal to ECM -no communicationWiring, poor connections, ABS
P1400 – P1499 (Emission control)
P1400Cold start emission control -malfunctionIntake/exhaust leak/blockage, mechanical fault, idle speed control (ISC) system, ignition control, engine coolant temperature (ECT) sensor, H02S
P1500 – P1599 (Vehicle or idle speed control)
P1514Throttle control unit, intake air flow -excessiveThrottle control unit, MAP sensor, CMP sensor signal, ECM
P1515Throttle command/actual throttle pOSition – signal variationWiring, throttle valve sticking, throttle control module
P1516Throttle command/actual throttle pOSition – signal variationWiring, throttle valve sticking, throttle control module
P1518Throttle control module/engine control module (ECM) -communication malfunctionWiring, throttle control module, ECM
P1600 – P1699 (ECM – computer output circuit)
P1600Engine control module (ECM) -malfunctionEngine control module (ECM)
P1621Engine control module (ECM) memory performanceECM
P1627Engine control module (ECM) -malfunctionEngine control module (ECM)
P1637Altemator ‘L’ terminal -circuit malfunctionWiring open circuit/short circuit to ground, alternator, battery temperature sensor, ECM
P1638Altemator ‘F’ terminal -circuit malfunctionWiring open circuit/short circuit to ground, alternator, ECM
P1680Engine control module (ECM) -malfunctionEngine control module (ECM)
P1681Engine control module (ECM) -malfunctionEngine control module (ECM)
P1682Throttle control module/engine control module (ECM) -ignition power supply variationWiring, ECM
P1683Engine control module (ECM) -malfunctionEngine control module (ECM)
P1800 – P1899 (Transmission)
P1810Transmission fluid pressure (TFP) switch -manual valve positionFluid level low, wiring, selector lever linkage incorrectly adjusted, ECMITCM
P1815Transmission fluid pressure (TFP) switch invalid gear selectionWiring, selector lever linkage incorrectly adjusted, TFP switch, ECM
P1816Transmission fluid pressure (TFP) switch -invalidgear selectionWiring, selector lever linkage incorrectly adjusted,TFP switch, ECMITCM
P1860Torque converter clutch (TCC) solenoid, pulse width modulation (PWM) -circuit malfunctionWiring open circuit/short circuit to ground, TCCsolenoid, ECM
P1875Transmission, 4WD low selection signal -circuit malfunctionWiring, transmission, four wheel drive control module, ECM