P2104Throttle Actuator Control System - Forced Idle
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2104 is a status code: it does not name a broken part but records that the throttle control has switched into a forced-idle failure mode. In Ford's 2012 summary this happens on second-generation ETC systems when two or three accelerator pedal sensor tracks are lost, so the computer can no longer read driver demand; the engine then holds a raised idle and ignores the pedal, with MIL and wrench lamp. The actual cause is stored alongside it, usually a pedal sensor code such as P2122-P2128 or P2138. CARB counts such default modes as malfunctions whenever they can raise emissions. Repair means fixing the causal code, then clearing P2104. Related states are limited power (P2106), limited rpm (P2110) and shutdown (P2105).
- What you may notice
- Engine stays at raised idle, pedal has no effect
- Engine and ETC/wrench warning lamps on
- Car can only creep to a safe place
- Likely causes
- LikelyFailure of two or more accelerator pedal sensor tracks
- PossiblePedal sensor wiring or shared 5 V reference fault
- RareECU input or software fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.