Powertrain, generic · Computer and auxiliary outputs

P065A Generator System Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Electrical fault in another module (lighting, wipers, blower) disabling smart charging
Loose or corroded B+ or high-current connection
Engine module software
Alternator or regulator faulty

Symptoms

  • Battery warning lamp (in some cases)
  • Fluctuating charging voltage reading
  • No check engine light (Chrysler)
  • Fault codes in other modules

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–400
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

alternatorvoltage regulatorgenerator control circuit

Related codes

P065BP065CP0620P2503P2504P0562

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.