P21CB
Reductant Control Module Supply Voltage Low.
- Generic
- Powertrain
- Generic code
How this code is built
- P
- SystemPowertrain
- 2
- Defined bySAE, the same on every car
- 1
- AreaFuel and air metering
- CB
- FaultThe specific fault in that area
Guide
Writing the guide for P21CB. The first open of a code takes up to a minute.