Powertrain
generic / SAE
P056F
Cold Start Turbocharger Boost Control B Performance
During cold-start the ECU runs an elevated boost target on the A turbo to support catalyst heat-up and cold-running combustion stability. The actual boost does not reach the cold-start target - typically a wastegate or VGT actuator sticking when cold.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 6F
Possible causes
- Actuator sticking when cold high
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: 200–1500 €
- Estimated time: 1.5–5 h
- Component: turbocharger b
- Component: wastegate b
- Component: vgt actuator b
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012