OBD-II code · Powertrain (generic)
P027B Fuel Pump Module B Control Circuit Range/Performance
Fuel pump module B does not respond as expected. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P027B?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule B internal fault
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
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 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Fuel Pump Module B
Related codes
- P025BFuel Pump Module A Control Circuit Range/Performance
- P0278Cylinder 6 Contribution/Balance
- P0279Cylinder 7 Injector A Circuit Low
- P027AFuel Pump Module B Control Circuit/Open
- P027CFuel Pump Module B Control Circuit Low
- P027DFuel Pump Module B Control Circuit High
- P027ECold Start Fuel Injection Quantity A Lower Than Expected
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.