13 documented codes across 32 real diagnostics.
Control module internal faults, memory, checksums and output-circuit drivers. A high share here is a coding or software problem, not a mechanical one.
Ranked by how often we actually see them
- P0647, A/C clutch relay control circuit high
- P0638, Throttle actuator A control range/performance, bank 1
- P060C, Internal control module main processor performance
- P0657, Actuator supply voltage A circuit open
- P0645, A/C clutch relay control circuit
- P0606, ECM/PCM processor
- P0641, Sensor reference voltage A circuit open
- P061B, not individually documented
- P062B, not individually documented
- P061D, not individually documented
- P0604, Internal control module RAM error
- P0632, Odometer not programmed in ECM/PCM
- P060B, Internal control module A/D processing performance