Throttle Position Output Circuit
The P2620 code means the vehicle's onboard diagnostic system has detected: Throttle Position Output Circuit. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $100 - $700 (parts and labor)
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Common Symptoms
- Transmission shifts erratically
- Traction control light on
- Cruise control inoperative
- Check engine light on
Probable Causes (Ranked by Likelihood)
- ECM throttle position output driver failure Very High
- Open wiring in throttle position output circuit High
- Damaged connector in output circuit Moderate
- Receiving module not recognizing signal Low
Step-by-Step Diagnostic Procedure
-
Verify throttle position sensor input to ECM is correct
-
Check throttle position output circuit wiring
-
Test ECM output signal at receiving module connector
-
Inspect connectors for damage or corrosion
Frequently Asked Questions
What modules use the throttle position output?
The transmission module uses it for shift scheduling, the traction control for stability calculations, and cruise control for speed maintenance.
Why does my transmission shift poorly with P2620?
Without accurate throttle position data, the transmission module cannot determine driver demand and defaults to a generic shift schedule.
Is this the same as a throttle position sensor code?
No. P2620 is about the ECM output circuit that distributes throttle position data to other modules, not the sensor itself.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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