P0638 Code - Throttle Actuator Control Range/Performance Bank 1

Discussion in 'P - Powetrain Codes' started by fault code, Jan 30, 2018.

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  1. fault code

    fault code Administrator Staff Member

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    What Does P0638 Mean?

    The Powertrain Control Module (PCM) compares the actual Throttle Possition (TP) with the target TP when the engine is running. If the difference is more than the specification, the PCM determines that there is a throttle actuator control circuit range/performance problem.

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    What are the common causes of P0638 ?

    The most likely cause of this code being stored is a defective throttle actuator control, throttle position actuator, or throttle position sensor. Other causes may include corroded, open, or shorted wiring or connectors in the CAN Bus harness, a loose control module ground strap or broken ground wire, the CAN bus may also be defective.

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    How do you troubleshoot P0638 ?

    If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

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