OBD-II code · Powertrain (generic, extended)
P229C Fuel Pressure Regulator B Exceeded Learning Limits - Too Low
Fuel Pressure Regulator B Exceeded Learning Limits - Too Low: the adaptive learning value has reached its lower limit, so the ECU can no longer compensate. This controls fuel-rail pressure.
Is it safe to drive with P229C?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyLong-term wear of regulator
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–6 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Pressure Regulator
Related codes
- P228EFuel Pressure Regulator A Exceeded Learning Limits - Too Low
- P2299Brake Pedal Position / Accelerator Pedal Position Correlation
- P229AFuel Pressure Regulator B Exceeded Control Limits - Pressure Too Low
- P229BFuel Pressure Regulator B Exceeded Control Limits - Pressure Too High
- P229DFuel Pressure Regulator B Exceeded Learning Limits - Too High
- P229ENOx Sensor Circuit (Bank 1 Sensor 2)
- P229FNOx Sensor Circuit Range/Performance Bank 1 Sensor 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.