Powertrain
generic / SAE
P063A
Generator Voltage Sense Circuit A
A general circuit fault is detected on the alternator voltage sense line A - the line over which the regulator measures battery-side voltage to set charging output.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 3A
Possible causes
- Open in sense line high
- Pack cell imbalance approaching service threshold low
- Ground point with elevated resistance low
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–350 €
- Estimated time: 0.5–1.8 h
- Component: alternator voltage sense a
- MIL / check engine light
Sources
References
sae:J2012