P2108: Throttle Actuator A Control Module Performance
Do not keep driving
Expect restricted power. Ask for the throttle body to be inspected and cleaned before a module is condemned — a stiff throttle makes the control system look faulty when it is doing its best with a mechanical problem.
What this code means
The module's throttle control function is not performing as its own monitoring expects — commanded and achieved positions disagreeing persistently, or the control loop behaving outside its designed limits.
The distinction from P2107 is that this is about behaviour rather than the processor's self-check, which leaves more room for the fault to be outside the module. A throttle that is mechanically stiff makes a healthy control loop look badly tuned, so carbon around the plate belongs on the suspect list before the electronics do.
Likely causes
Start here
- Carbon deposits in the throttle body · easy
- Faulty throttle actuator motor · moderate
Less common
- Faulty engine control module · specialist
- Poor module ground connection · moderate
- Weak throttle return spring · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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