Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / 21
Possible causes
- Output wire shorted to ground high
- Output buffer transistor failed medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–800 €
- Estimated time: 0.8–3 h
- Component: control module
- Component: signal output buffer
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012