P0639
PowertrainElectronic Throttlehigh severityThrottle Actuator Control Range/Performance (Bank 2)
What P0639 Means
The PCM detected the bank 2 throttle actuator is out of the expected operating range. This may cause reduced power and limp mode on engines with dual throttle bodies.
Symptoms
- Reduced engine power
- Check engine light on
- Poor throttle response
Common Causes
- Faulty bank 2 throttle body/actuator
- Dirty throttle plate
- Damaged throttle control wiring
- Faulty PCM
Diagnostic Steps
- Scan throttle position data for bank 2
- Inspect and clean throttle body
- Test throttle actuator and wiring
- Perform relearn or replace throttle body
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