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.
- U028EGeneric · NetworkLost Communication with Active Aerodynamic Feature Control Module B
- U028FGeneric · NetworkLost Communication with Active Aerodynamic Feature Control Module C
- U0290Generic · NetworkLost Communication with Active Aerodynamic Feature Control Module D
- U0291Generic · NetworkLost Communication With Gear Shift Control Module B
- U0292Generic · NetworkLost Communication With Drive Motor Control Module B
- U0293Generic · NetworkLost Communication With Hybrid/EV Powertrain Control Module
- U0294Generic · NetworkLost Communication With Powertrain Control Monitor Module
- U0295Generic · NetworkLost Communication With AC/AC Converter Control Module
- U0296Generic · NetworkLost Communication With AC/DC Converter Control Module A
- U0297Generic · NetworkLost Communication With AC/DC Converter Control Module B
- U0298Generic · NetworkLost Communication With DC/DC Converter Control Module A
- U0299Generic · NetworkLost Communication With DC/DC Converter Control Module B
- U029AGeneric · NetworkLost Communication With Hybrid/EV Battery Pack Sensor Module
- U029BGeneric · NetworkLost Communication With Drive Motor Control Module C
- U029CGeneric · NetworkLost Communication With Drive Motor Control Module D
- U029DGeneric · NetworkLost Communication With NOx Sensor A
- U029EGeneric · NetworkLost Communication With NOx Sensor B
- U029FGeneric · NetworkLost Communication With Evaporative Emission System Leak Detection Control Module
- U02A0Generic · NetworkInvalid Data Received From Hybrid/EV Battery Interface Control Module D
- U02A1Generic · NetworkLost Communication With NOx Sensor C
- U02A2Generic · NetworkLost Communication With Reductant Quality Module
- U02A3Generic · NetworkLost Communication With Particulate Matter Sensor
- U02A4Generic · NetworkLost Communication With NH3 Sensor
- U02A5Generic · NetworkLost Communication With Reductant Heater Control Module
- U02A6Generic · NetworkLost Communication With Safety Integration Control Module
- U02A7Generic · NetworkLost Communication With Engine Sound Control 1
- U02A8Generic · NetworkLost Communication With Engine Sound Control 2
- U02A9Generic · NetworkLost Communication With Charge Air Cooler Coolant Pump A
- U02AAGeneric · NetworkLost Communication With Engine Disconnect Clutch
- U02ABGeneric · NetworkLost Communication With Vehicle Thermal Management Control Module