P0639Throttle Actuator Control Range/Performance Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0639 is the bank 2 counterpart of P0638 and only applies to engines with two separate electronic throttles, one per cylinder bank (some V8, V10 and V12 engines with separate intake paths). The module compares target and actual angle and the duty cycle the motor needs; if the plate does not follow, it is de-energised and springs to its rest position, and power is limited. No manufacturer document available to us uses P0639 – this follows P0638 (Subaru: more than 3.5° deviation for 250 ms) and CARB's function check of output components. Ford calls a second throttle 'throttle actuator B' and reports it as P211A ff, its sensors as sensor C (P0225/P0229). Uneven filling of the two banks can also cause a rough idle.
- What you may notice
- Check engine light
- Limp mode, loss of power
- Rough idle from uneven bank filling
- Likely causes
- LikelyBank 2 throttle dirty or stiff
- PossibleBank 2 actuator motor or gears faulty
- RareIcing
- RareWiring or module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.