Powertrain
generic / SAE
P0653
Sensor Reference Voltage B Circuit High
Same as P0651 with the reference rail shorted to supply or above the design voltage. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 53
Possible causes
- Reference rail shorted to supply high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source 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: 80–400 €
- Estimated time: 0.5–2 h
- Component: sensor reference voltage b
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012