What are the common causes of P218C?

A faulty throttle position sensor. A throttle/fuel inhibit B wiring fault. Corrosion at the inhibit B connector. Low fuel pressure or a weak fuel pump. A faulty engine control unit.

Read the throttle/fuel inhibit B circuit on a scan tool. Check the throttle position sensor signal. Test the inhibit B wiring for a short or an open. Check the fuel pressure. Inspect the inhibit B connector for corrosion. Clear the code and retest.

P218C

Throttle/Fuel Inhibit B Circuit Range/Performance

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

What it means

P218C means Throttle/Fuel Inhibit B Circuit Range/Performance.

Check these first

A faulty throttle position sensor
A throttle/fuel inhibit B wiring fault
Corrosion at the inhibit B connector
Low fuel pressure or a weak fuel pump
A faulty engine control unit

What to do next

Read the throttle/fuel inhibit B circuit on a scan tool
Check the throttle position sensor signal
Test the inhibit B wiring for a short or an open
Check the fuel pressure
Inspect the inhibit B connector for corrosion
Clear the code and retest

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Updated

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