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.
- P1686Oldsmobile · PowertrainDriver 5 Line 6
- P1687Oldsmobile · PowertrainDriver 5 Line 7
- P1689Oldsmobile · PowertrainDelivered Torque Circuit Fault
- P1690Oldsmobile · PowertrainECM Loop Overrun
- P1691Oldsmobile · PowertrainCoolant Gauge Circuit Low Voltage
- P1692Oldsmobile · PowertrainCoolant Gauge Circuit High Voltage
- P1693Oldsmobile · PowertrainTachometer Circuit Low Voltage
- P1694Oldsmobile · PowertrainTachometer Circuit High Voltage
- P1695Oldsmobile · PowertrainTCM To ECM Torque Reduction Circuit
- P1700Oldsmobile · PowertrainTransmission MIL Request
- P1701Oldsmobile · PowertrainTransmission MIL Request Circuit
- P1705Oldsmobile · PowertrainP/N Signal Output Circuit
- P1740Oldsmobile · PowertrainTransmission Torque Reduction Request Circuit
- P1743Oldsmobile · PowertrainTP Signal From ECM
- P1760Oldsmobile · PowertrainECM Supply Voltage Interrupted
- P1779Oldsmobile · PowertrainEngine Torque Delivered To TCM Signal
- P1780Oldsmobile · PowertrainPark Neutral Position Switch Circuit Engine Torque Signal Circuit
- P1790Oldsmobile · PowertrainTransmission Control Module Checksum
- P1791Oldsmobile · PowertrainTransmission Control Module Loop
- P1792Oldsmobile · PowertrainTransmission Control Module Reprogrammable Memory
- P1793Oldsmobile · PowertrainTransmission Control Module Stack Overrun
- P1795Oldsmobile · PowertrainCAN Bus Throttle Body Position
- P1800Oldsmobile · PowertrainTCM Power Control Relay Circuit Open
- P1801Oldsmobile · PowertrainPerformance Selector Switch Failure
- P1804Oldsmobile · PowertrainGround Control Relay
- P1810Oldsmobile · PowertrainTFP Valve Position Switch Circuit
- P1811Oldsmobile · PowertrainMaximum Adapt And Long Shift
- P1812Oldsmobile · PowertrainTransmission Over Temperature Condition
- P1813Oldsmobile · PowertrainTorque Control
- P1814Oldsmobile · PowertrainTorque Converter Overstressed