DTC codes
Look up an OBD-II fault code: what it means on every car or on your make, and how to track it down.
How to read a code
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 4
- AreaAuxiliary emission controls
- 20
- FaultThe specific fault in that area
Read the code
Note every stored and pending code your scanner shows, such as P0420.
Find it
Search by code or by words. For a manufacturer code (P1, B1, C1, U1) pick your make: its meaning differs by make.
Open the code
Its page explains the symptoms, likely causes, the checks to run and the fixes.
- P1100Other · PowertrainMAF Sensor Intermittent/ Check of all OBDII Systems Not Complete
- P1101Other · PowertrainMAF Sensor Out Of Self Test Range./KOER Not Able To Complete KOER Aborted
- P1102Other · PowertrainMAF Sensor In Range But Lower Than Expected
- P1103Other · PowertrainMAF Sensor In Range But Higher Than Expected
- P1104Other · PowertrainMAF Ground Malfunction
- P1105Other · PowertrainDual Alternator Upper Fault
- P1106Other · PowertrainDual Alternator Lower Fault/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
- P1107Other · PowertrainDual Alternator Lower Circuit Malfunction/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage
- P1108Other · PowertrainDual Alternator Battery Lamp Circuit Malfunction
- P1109Other · PowertrainIAT - B Sensor Intermittent
- P1110Other · PowertrainIAT Sensor (D/C) Open/Short
- P1111Other · PowertrainIntake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage
- P1112Other · PowertrainIntake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
- P1113Other · PowertrainIAT Sensor Open/Short
- P1114Other · PowertrainEngine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage/IAT - B Circuit Low Input
- P1115Other · PowertrainEngine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage/IAT - B Circuit High Input
- P1116Other · PowertrainEngine Coolant sensor out of range/ECT Sensor Out Of Self Test Range
- P1117Other · PowertrainEngine Coolant Sensor intermittent/ECT Sensor Intermittent
- P1118Other · PowertrainManifold Absolute Temperature Circuit Low Input
- P1119Other · PowertrainManifold Absolute Temperature Circuit High Input
- P1120Other · PowertrainThrottle position sensor out of range
- P1121Other · PowertrainThrottle Position (TP) Sensor Circuit Intermittent High Voltage
- P1122Other · PowertrainThrottle Position (TP) Sensor Circuit Intermittent Low Voltage
- P1123Other · PowertrainThrottle Position Sensor In Range But Higher Than Expected
- P1124Other · PowertrainThrottle Position Sensor Out Of Self Test Range
- P1125Other · PowertrainThrottle position sensor intermittent
- P1126Other · PowertrainThrottle Position (Narrow Range) Sensor Circuit Malfunction
- P1127Other · PowertrainExhaust Not Warm, Downstream O2 Sensor
- P1128Other · PowertrainUpstream Heated O2 Sensors Swapped
- P1129Other · PowertrainDownstream Heated O2 Sensors Swapped