Powertrain
generic / SAE
P229A
Fuel Pressure Regulator B Exceeded Control Limits - Pressure Too Low
Fuel pressure regulator A cannot maintain target pressure — measured pressure stays below the lower control limit despite full closed-loop authority. Typical for a leaking regulator, weak high-pressure pump, or restricted suction line.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number2 / 9A
Possible causes
- Regulator leaks or pump weak high
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–2500 €
- Estimated time: 1.5–6 h
- Component: fuel pressure regulator
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012