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P0639 is a diagnostic trouble code (DTC) for "P0639 Throttle Actuator Control Range/Performance (Bank 2)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0630 trouble code is stored when the Powertrain Control Module (PCM) or one of the other control modules has detected a fault in the throttle actuator control in bank 2 of the engine, which refers to the bank in the engine not containing the number one cylinder. Other control modules that might detect this fault include the alternate fuel control module, the anti-theft module, the antilock brake control module, the body control module, the climate control module, the cruise control module, the fuel injection control module, the instrument panel control module, the proximity alert module, the traction control module, and the turbo control module. In addition to a P0639 trouble code, the PCM might also store a P0638 code.
The storage of a P0639 trouble code means that the throttle actuator control has encountered an error. While the storage of this code usually results in the illumination of the Check Engine light, some vehicle models require multiple drive cycles, up to eight, with a failure for the Check Engine light to come on.
A defective throttle actuator control, throttle position actuator, or throttle position sensor can cause the storage of a P0639 trouble code. In addition, faulty wiring or connectors within the Control Area Network (CAN) Bus harness or a loose ground strap or broken ground wire within one of the control modules can cause storage of this code. A final cause is a defective CAN Bus harness.
Symptoms of a P0639 trouble code is a failure for the vehicle to start, misfires while idling, and stalling. Additional symptoms include black smoke issuing from the exhaust when starting the vehicle and poor acceleration.
To diagnose a P0639 trouble code, a mechanic needs an advanced scanner, a digital volt/ohm meter, a specialized scanner, and a CAN Bus system wiring diagram. When they have gathered the necessary equipment, the mechanic should perform the following steps:
Most mistakes made by mechanics in relation to a P0639 trouble code include treating the symptoms and codes stored in reaction to the code storage. A mechanic can best treat a P0639 trouble code by downloading the freeze frame data and treating the codes in the order they were stored.
While a vehicle can still operate with a P0639 trouble code, it is best to diagnose and treat a P0639 trouble code as soon as possible to avoid the no-start or stalling condition that can accompany it.
To fix and clear a P0639 trouble code, a mechanic must perform the following repairs:
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