P0639 code meaning
Throttle Actuator Control Range/Performance Bank 2
Powertrain system Generic code P06xx codes Check engine light
What P0639 means
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.
P0639 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0639
- Check engine light
- Limp mode, loss of power
- Rough idle from uneven bank filling
Common causes of P0639
- Most likelyBank 2 throttle dirty or stiff
- PossibleBank 2 actuator motor or gears faulty
- Less likelyIcing
- Less likelyWiring or module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Throttle bodyThrottle actuator motorEngine control module
What each part of P0639 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 39 | The exact fault in that area. |
What to do next
- Note P0639 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0639
What does P0639 mean?
P0639 means "Throttle Actuator Control Range/Performance Bank 2". 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). It is a generic code, so it means the same on every make.
Is it safe to drive with P0639?
Drive gently and only to a workshop. With P0639 the car can go into limp mode (reduced power) to protect itself.
Will P0639 fail an emissions test?
Yes, it can. P0639 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0639 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0639 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.