OBD-II code · Powertrain (generic)
P063D Generator Voltage Sense Circuit A High
Same as P063A with the sense voltage above the plausible range.
Is it safe to drive with P063D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySense line shorted to supply
- Less likelyPack cell imbalance approaching service threshold
- Less likelyGround point with elevated resistance
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–1.8 h
- Emissions test
- Usually unaffected
- Parts involved
- Alternator Voltage Sense A
Related codes
- P2CC4Generator Voltage Sense Circuit B High
- P063AGenerator Voltage Sense Circuit A
- P063BGenerator Voltage Sense Circuit A Range or Performance
- P063CGenerator Voltage Sense Circuit A Low
- P063EAuto Configuration Throttle Input Not Present Bank 1
- P063FAuto Configuration Engine Coolant Temperature Input Not Present
- P0640Intake Air Heater Control Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.