DTC C121C Jeep
Data Circuit Malfunction
Data Circuit Malfunction
Description
Key on, and the PCM detected the SCP was invalid, or that it was missing data from the Fuel System during the CCM test.
Cause and Solution
SCP data bus to other controller(s) is open or shorted to groundFuel System controller is damaged or has failedPCM has failed
Video Guide
Diagnostic Info
- DTC Code: C121C
- Brand: Jeep