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.
- P1508Buick · PowertrainIAC System Low RPM
- P1509Buick · PowertrainIAC System High RPM
- P1510Buick · PowertrainBack UP Power Supply
- P1511Buick · PowertrainThrottle Control System Backup System Performance
- P1514Buick · PowertrainThrottle Body Performance
- P1515Buick · PowertrainControl Module Throttle Actuator Position Performance
- P1516Buick · PowertrainThrottle Actuator Control (TAC) Module Throttle Actuator Position Performance
- P1517Buick · PowertrainThrottle Actuator Control (TAC) Module Performance
- P1518Buick · PowertrainThrottle Actuator Control (TAC) Module Serial Data Circuit
- P1519Buick · PowertrainElectronic Throttle Module Low Volts Communication Disable
- P1520Buick · PowertrainGear Indicator System
- P1521Buick · PowertrainTransmission Engaged At High Throttle Angle
- P1522Buick · PowertrainPark/Neutral To Drive/Reverse At High RPM
- P1523Buick · PowertrainElectronic Throttle Control Throttle Return
- P1524Buick · PowertrainTP Sensor Learned CI, Throttle Angle Out Of Range
- P1525Buick · PowertrainThrottle Body Service Required
- P1526Buick · PowertrainTP Sensor Learn Not Complete
- P1527Buick · PowertrainTransmission Range/Pressure Switch Comparison
- P1528Buick · PowertrainGovernor
- P1529Buick · PowertrainHeated Windshield Request Problem
- P1530Buick · PowertrainIgnition Timing Adjustment Switch Circuit
- P1531Buick · PowertrainA/C Low Side Temerature Sensor Fault
- P1532Buick · PowertrainA/C Evaporator Temperature Sensor Circuit Low Voltage
- P1533Buick · PowertrainA/C Evaporator Temperature Sensor Circuit High Voltage
- P1534Buick · PowertrainA/C High Side Temerature Sensor Low Voltage
- P1535Buick · PowertrainA/C High Side Temperature Sensor Circuit
- P1536Buick · PowertrainA/C System ECT Overtemperature
- P1537Buick · PowertrainA/C Request Circuit Low Voltage
- P1538Buick · PowertrainA/C request Circuit High Voltage
- P1539Buick · PowertrainAir Conditioning (A/C) Clutch Feedback Circuit High Voltage