OBD-II code · Powertrain (generic, extended)
P2100 Throttle Actuator Control Motor Circuit Open
The drive-by-wire throttle motor circuit is open — no current flow detected. The ECU loses authority over the throttle plate and forces a limp-home with reduced power.
Is it safe to drive with P2100?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyThrottle motor failed
- PossibleConnector loose or corroded
- PossibleWiring break to throttle body
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Throttle Actuator Motor, Throttle Body Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.