Powertrain
generic or reserved
P340C
Deactivation/Exhaust Valve Control Circuit Bank 1
Generic electrical fault on the cylinder deactivation/exhaust valve control circuit on bank 1. The exhaust control valve modulates exhaust backpressure or routing (EGR feed, sound, regen support); a malfunction shifts torque mapping and may trigger limp mode.
SystemPowertrain
Typegeneric or reserved
GroupP3
Range / number4 / 0C
Possible causes
- Deactivation solenoid failed high
- Wiring break or unplugged connector medium
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 1.5–6 h
- Component: cylinder deactivation solenoid
- Component: actuator wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012