P065AGenerator System Performance
- Generic OBD-II code · Powertrain
- How the car detects it
- Demand-controlled (smart) charging lets the module vary alternator voltage; the charging system is not an emission component, so these codes usually come without the check engine light. P065A is the function check of the whole charging strategy. Chrysler (Stellantis) explains it as a non-MIL code: the engine module switches off demand-controlled charging and falls back to normal charging because of electrical faults in other modules – returned alternators replaced for P065A were found to be fine. Other Stellantis cases trace it, together with P2503/P2504, to loose B+ or high-current connections, and the Ram 1500 3.0 EcoDiesel Gen 3 received a software update. The result is a constant charging voltage instead of smart charging, possibly with a battery lamp; there is no power limitation. Check codes in other modules and the main battery connections before replacing the alternator.
- What you may notice
- Battery warning lamp (in some cases)
- Fluctuating charging voltage reading
- No check engine light (Chrysler)
- Fault codes in other modules
- Likely causes
- LikelyElectrical fault in another module (lighting, wipers, blower) disabling smart charging
- PossibleLoose or corroded B+ or high-current connection
- PossibleEngine module software
- RareAlternator or regulator faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.