Powertrain
generic / SAE
P004B
Turbocharger/Supercharger Boost Control B Circuit Range/Performance
Boost control B mechanical/hydraulic deviation from target. Same as P0046 on actuator B. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number– / 4B
Possible causes
- Vacuum/boost line leak high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping low
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–1500 €
- Estimated time: 1–6 h
- Component: boost control solenoid b
- Component: wastegate b
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012