How much does it cost to fix P2108?

DIY repair typically costs $100–$500 for parts. Professional repair runs $300–$1500 including parts and labor.

P2108

Powertrain

High

Throttle Actuator Control Module Performance

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The P2108 code indicates that the throttle actuator control module — the electronic brain that manages the throttle body — is not performing within its expected specifications. On some vehicles, this module is integrated into the PCM, while on others it's a separate unit. This code means the module's internal processing or output is degraded.

This is a serious code because the throttle control module is responsible for translating your gas pedal input into precise throttle plate movement. When it's not performing correctly, the vehicle may exhibit unpredictable throttle behavior, including surging, stalling, or unresponsive acceleration. The PCM will typically put the vehicle into limp mode as a safety precaution.

Professional diagnosis is recommended for this code. The technician will need to determine whether the issue is the control module itself, the throttle body, or the wiring between them. In some cases, a PCM software update or reflash can resolve the problem. If module replacement is needed, it will typically require programming or calibration to the specific vehicle, which requires dealer-level diagnostic equipment.

Severity

High — Immediate AttentionWithin 24 Hours

Symptoms

•Check engine light on
•Vehicle enters limp mode with limited power
•Erratic throttle response or delayed acceleration
•Engine may surge or hunt at idle
•Possible stalling when coming to a stop

Likely Causes

Failing throttle actuator control module35%

The dedicated control module that manages the electronic throttle system can develop internal processor or circuit faults that affect its ability to accurately and consistently control the throttle actuator motor.

Electronic throttle body malfunction30%

A throttle body with worn internal components or intermittent electrical faults can cause performance readings that fall outside the control module's expected parameters, triggering this code.

Wiring or connector problems between module and throttle body20%

Corroded, loose, or damaged electrical connections between the throttle control module and the throttle body assembly can cause intermittent signal loss or voltage drops that the module interprets as a performance issue.

PCM software glitch or calibration error15%

Outdated PCM software or a calibration error can cause the throttle control module to operate outside expected parameters, particularly after a battery disconnect or other power interruption.