Powertrain
generic / SAE
P25BB
Regeneration Control Switch Circuit Low
Regeneration control switch input reads stuck low — short to ground or stuck-closed contact. The ECM may see a constant regen request which it cannot service while the vehicle is moving.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / BB
Possible causes
- Switch wire shorted to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 60–350 €
- Estimated time: 0.3–1.5 h
- Component: regen request switch
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012