Powertrain, generic · Computer and auxiliary outputs

P0639 Throttle Actuator Control Range/Performance Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Bank 2 throttle dirty or stiff
Bank 2 actuator motor or gears faulty
Icing
Wiring or module

Symptoms

  • Check engine light
  • Limp mode, loss of power
  • Rough idle from uneven bank filling

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

throttle bodythrottle actuator motorengine control module

Related codes

P0638P0225P0229P2135P2119

References: law.cornell.edu, saabwisonline.com, fordservicecontent.com.