P2D77Battery Charger Control Module B Performance
- Generic OBD-II code · Powertrain
- How the car detects it
- P2D77 says the control electronics of charger B, a second on-board charger or charger stage, do not work as intended; faults of its processor are filed separately under P2D78. No manufacturer documents P2D77 publicly. The A-side twin P0D67 shows what such a check covers: Ford's 2014 hybrid OBD summary flags it during an active charge for internal faults that prevent charging, such as overvoltage in the low- or high-voltage section, a failed PFC stage or a broken high-voltage current sensor. On the 2022 Outlander PHEV, Mitsubishi watches the charger's internal 3.3, 6 and 12 V rails for 1 s and then stops charging. That a charger B exists is shown by Toyota's 6.6 kW RAV4 Prime charger, whose B stage has its own codes. Plug-in charging fails; driving continues.
- What you may notice
- AC charging does not start or stops after a short time
- Charging fault message or warning in the instrument cluster
- Charging possible only at reduced power, if the other charger path still works
- Likely causes
- LikelyInternal power or control stage of charger B failed (unit replacement)
- PossibleInternal low-voltage supply rail of charger B out of tolerance
- RareWeak 12 V supply or poor ground at the charger
- RareCharger software fault, cured by an update where one exists
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.