What are the common causes of P218B?

A short or open in the throttle/fuel inhibit B wiring. Corrosion at the throttle/fuel inhibit B connector. A failed throttle/fuel inhibit B solenoid. A failed ECM. A throttle position or mass airflow sensor fault.

Read the throttle/fuel inhibit B circuit status on a scan tool. Test the inhibit B wiring for a short or an open. Check the inhibit B connector for corrosion. Test the inhibit B solenoid for proper operation. Replace the throttle/fuel inhibit B solenoid if the circuit tests good. Clear the code and retest.

P218B

Throttle/Fuel Inhibit B Circuit

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P218B means Throttle/Fuel Inhibit B Circuit.

Check these first

A short or open in the throttle/fuel inhibit B wiring
Corrosion at the throttle/fuel inhibit B connector
A failed throttle/fuel inhibit B solenoid
A failed ECM
A throttle position or mass airflow sensor fault

What to do next

Read the throttle/fuel inhibit B circuit status on a scan tool
Test the inhibit B wiring for a short or an open
Check the inhibit B connector for corrosion
Test the inhibit B solenoid for proper operation
Replace the throttle/fuel inhibit B solenoid if the circuit tests good
Clear the code and retest

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Updated

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