What are the common causes of P027B?

A faulty fuel pump control module B. A short or high resistance in the module B wiring. A failing fuel pump drawing wrong current. Corrosion in the module B connector. A weak battery or charging system.

Command the fuel pump through its range with a scan tool. Measure the module B current draw against spec. Inspect the module B connector and wiring for damage. Check battery voltage and the charging system. Replace fuel pump control module B if the fault follows the command. Clear the code and retest.

P027B

Fuel Pump Module B Control Circuit Range/Performance

System: Injector circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P027B means Fuel Pump Module B Control Circuit Range/Performance.

Where it lives

For P027B, start at the pump the description names.

Check these first

A faulty fuel pump control module B
A short or high resistance in the module B wiring
A failing fuel pump drawing wrong current
Corrosion in the module B connector
A weak battery or charging system

What to do next

Command the fuel pump through its range with a scan tool
Measure the module B current draw against spec
Inspect the module B connector and wiring for damage
Check battery voltage and the charging system
Replace fuel pump control module B if the fault follows the command
Clear the code and retest

Look up another code

Code or symptom

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

Generic SAE J2012 definition. Last updated 2026-10-10.