P2D78Battery Charger Control Module B Processor Performance
- Generic OBD-II code · Powertrain
- How the car detects it
- P2D78 points at the processor inside the control module of charger B: its self-tests of program or working memory have failed, so the module no longer trusts its own computations. All other functional faults of that module belong to P2D77. No manufacturer documents P2D78 publicly. The kind of test meant is visible in the A-side twin P0E5E, for which Mitsubishi's 2023 PHEV code table names two triggers in the charger controller: a failed CRC check of the ROM and a failed RAM write/read test. CARB requires plug-in hybrids to detect charger malfunctions that disable charging or reduce charging performance. A charger that cannot vouch for its processor will not switch grid power into the battery, so charging is refused. Reprogramming may clear a corrupted memory image; a hardware fault means a new charger.
- What you may notice
- Plug-in charging is refused right after connecting
- Charging system warning in the cluster
- Likely causes
- LikelyMemory or processor hardware in the charger B control unit defective
- PossibleCorrupted charger software, e.g. after an interrupted update
- Rare12 V supply dip while the charger boots
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.