Powertrain
generic / SAE
P004A
Turbocharger/Supercharger Boost Control B Circuit/Open
Open circuit at boost control solenoid B (twin-turbo or two-stage system). Same diagnosis as P0045 on actuator B.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number– / 4A
Possible causes
- Wiring break high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor low
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–600 €
- Estimated time: 0.5–3 h
- Component: boost control solenoid b
- Component: actuator wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012