P027A
Fuel Pump Module B Control Circuit/Open
Fuel delivery
Generic OBD-II
High
What it means
P027A means the ECM has detected an open in the 'B' fuel-pump module control circuit. Because this circuit drives the fuel pump, an open connection can stop or interrupt fuel delivery — causing hard starting, stalling, or a no-start until the wiring or module is repaired.
High
Can I keep driving? Risky — an open fuel-pump control circuit can stop the pump and cause stalling or a no-start, so fix it before the car strands you.
Common symptoms
What you'll notice
- Check-engine light on
- Hard starting, or a crank with no-start
- Stalling or rough running from interrupted fuel delivery
- May fail an emissions test
Common causes
Most likely first
- Open or broken wiring in the fuel-pump module 'B' control circuitLikely
- Blown fuel-pump fuse or a corroded/disconnected connectorCommon
- Faulty fuel-pump (driver) module or relayCommon
- PCM control-circuit driver fault (less common)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check the fuel-pump fuse and connectors first.
- Inspect the module 'B' control wiring for an open, break, or corrosion.
- Measure control-circuit continuity and voltage with the key on and while cranking.
- If the circuit is good, test the fuel-pump driver module/relay; consider the PCM last. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P027A?+
Not reliably. An open control circuit can cut power to the pump and leave you stranded. Address it promptly.
Can I just clear P027A?+
It returns until the open circuit or module fault is repaired. This is an electrical fault, not a passing glitch.
Related codes
Often seen with P027A
Read & clear P027A yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX