OBD-II code · Powertrain (generic, extended)
P218B Throttle/Fuel Inhibit B Circuit
A general electrical fault on the throttle/fuel inhibit signal B — used by anti-theft, immobiliser, or transmission to forbid throttle/fuel until released.
Is it safe to drive with P218B?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyInhibit signal lost
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–4 h
- Emissions test
- Likely to fail
- Parts involved
- Throttle Fuel Inhibit, Immobiliser
Related codes
- P2552Throttle/Fuel Inhibit A Circuit
- P2188System Too Rich at Idle (Bank 1)
- P2189System Too Lean at Idle (Bank 2)
- P218AThrottle Actuator B Control System - Idle Position Not Learned
- P218CThrottle/Fuel Inhibit B Circuit Range/Performance
- P218DThrottle/Fuel Inhibit B Circuit Low
- P218EThrottle/Fuel Inhibit B Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.