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.
- P1780Cadillac · PowertrainPark/Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit
- P1780Chevrolet · PowertrainPark/Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit
- P1780Ford · PowertrainTransmission Control Switch Circuit is Out of Self-Test Range
- P1780GM · PowertrainPark Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit
- P1780GMC · PowertrainPark Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit
- P1780Lexus · PowertrainPNP Switch Malfunction
- P1780Lincoln · PowertrainTransmission Control Switch Circuit is Out of Self-Test Range
- P1780Mazda · PowertrainTransmission Control Switch Circuit, Overdrive Off Switch Not Cycled During The Self Test
- P1780Mercedes-Benz · PowertrainModulation Pressure Switchover Valve ATCC Y34 Or Upshift Delay Switchover Valve ATCC Y35
- P1780Mercury · PowertrainTransmission Control Switch Circuit is Out of Self-Test Range
- P1780Nissan · PowertrainTransmission Control Switch Circuit Overdrive Off Switch Not Cycled During The Self Test
- P1780Oldsmobile · PowertrainPark Neutral Position Switch Circuit Engine Torque Signal Circuit
- P1780Other · PowertrainTrans Control Switch (O/D Cancel) Out of Self Test Range
- P1780Saturn · PowertrainPark Neutral Position PNP Switch Circuit Engine Torque Signal Circuit
- P1780Toyota · PowertrainPark Neutral Position Switch Malfunction Only For A/T
- P1780Volkswagen · PowertrainEngine Intervention Readable
- P1781Ford · Powertrain4x4 Low Switch is Out of Self-Test Range
- P1781Lincoln · Powertrain4x4 Low Switch is Out of Self-Test Range
- P1781Mazda · PowertrainTransmission 4x4 Low Switch Out Of Range Fault
- P1781Mercedes-Benz · PowertrainUpshift Delay Switchover Valve ATCC Y35
- P1781Mercury · Powertrain4x4 Low Switch is Out of Self-Test Range
- P1781Nissan · PowertrainTransmission 4x4 Low Switch Out Of Range Fault
- P1781Other · Powertrain4X4 Switch Out of Self Test Range
- P1781Volkswagen · PowertrainEngine Torque Reduction Open Short To Ground
- P1782Ford · PowertrainP/ES Circuit Out Of Self Test Range
- P1782Lincoln · PowertrainP/ES Circuit Out Of Self Test Range
- P1782Mercury · PowertrainP/ES Circuit Out Of Self Test Range
- P1782Other · PowertrainP/ES Circuit Out Of Self Test Range
- P1782Volkswagen · PowertrainEngine Torque Reduction Short To B+
- P1783Ford · PowertrainTransmission Over-Temperature Condition