Throttle Actuator Control Range/Performance Bank 2

Where it lives

For P0639, start at the actuator the description names. The description of P0639 puts it on bank 2.

Check these first

• Carbon buildup on the bank 2 throttle plate
• A failed throttle actuator motor on bank 2
• A failed throttle position sensor on bank 2
• A wiring fault on the bank 2 throttle body
• A faulty ECM

What to do next

1. Watch the throttle command and position on bank 2 while revving
2. Clean carbon from the bank 2 throttle body
3. Inspect the bank 2 throttle body connector and wiring
4. Compare both throttle tracks on bank 2
5. Replace the bank 2 throttle body if it does not follow the command
6. Clear the code and retest

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