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P0638 – VOLVO

Code : P0638
Make : VOLVO
Description : P0638 VOLVO Throttle Actuator Control Range/Performance
Possible causes :
– Drive-by-wire control system malfunction
– Throttle actuator malfunction
– Throttle valve malfunction
– PCM malfunction
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.

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