OBD-II code · Powertrain (generic, extended)
P2621 Throttle Position Output Circuit Low
The buffered throttle position output that the engine controller sends to the transmission and body modules is below the expected level. Usually a short to ground or a failed output stage.
Is it safe to drive with P2621?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOutput wire shorted to ground
- PossibleOutput buffer transistor failed
- Less likelyConnector pins corroded - high contact resistance
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
- Best left to a mechanic
- Typical labour
- 0.8–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Control Module, Signal Output Buffer, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.