OBD-II code · Powertrain (generic, extended)
P218D Throttle/Fuel Inhibit B Circuit Low
Throttle/fuel inhibit B line stuck low. 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 P218D?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyShort to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Throttle Fuel Inhibit
Related codes
- P218BThrottle/Fuel Inhibit B Circuit
- P2554Throttle/Fuel Inhibit A Circuit Low
- P218AThrottle Actuator B Control System - Idle Position Not Learned
- P218CThrottle/Fuel Inhibit B Circuit Range/Performance
- P218EThrottle/Fuel Inhibit B Circuit High
- P218FReductant No Flow Detected
- P2190System Too Rich at Idle (Bank 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.