OBD-II code · Powertrain (generic, extended)
P229D Fuel Pressure Regulator B Exceeded Learning Limits - Too High
The adaptive learning offset for fuel pressure regulator B has reached the upper limit. Long-term drift upward indicates progressive wear of the regulator or a return path that is becoming restricted.
Is it safe to drive with P229D?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyLong-term drift upward
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
- P228FFuel Pressure Regulator A Exceeded Learning Limits - Too High
- P229AFuel Pressure Regulator B Exceeded Control Limits - Pressure Too Low
- P229BFuel Pressure Regulator B Exceeded Control Limits - Pressure Too High
- P229CFuel Pressure Regulator B Exceeded Learning Limits - Too Low
- P229ENOx Sensor Circuit (Bank 1 Sensor 2)
- P229FNOx Sensor Circuit Range/Performance Bank 1 Sensor 2
- P22A0NOx Sensor Circuit Low (Bank 1 Sensor 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.