P2108

Throttle Actuator A Control Module Performance

Throttle control (drive-by-wire) Generic OBD-II Medium

What it means

P2108 means the ECM has detected that the electronic throttle actuator control isn't performing as expected — the throttle isn't responding the way the module commands. It's commonly caused by a dirty throttle body, a wiring fault, or a failing throttle actuator, and the car may fall back to a reduced-power mode to stay safe.

Medium

Can I keep driving? Usually drivable, but the ECM may drop the engine into reduced-power 'limp' mode; get it looked at soon, especially if power sags on the highway.

Real-world scan data

Seen in

464

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2108 scans

P2119in 38.4% of scans

P0226in 23.1% of scans

P0657in 17.2% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Reduced power or 'limp' (failsafe) mode
Rough or unstable idle
Hesitation or poor throttle response

Common causes

Most likely first

Faulty throttle body / throttle actuator motorLikely
Dirty or carbon-fouled throttle bore causing sticky operationCommon
Wiring or connector faults in the throttle actuator circuitCommon
Failing throttle actuator control module or ECM/PCMLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and check for related throttle codes (P2100-P2103, P2110) to narrow it down.
Clean the throttle body and bore, then clear the code and re-test before replacing parts.
Inspect the throttle actuator wiring and connector for damage, corrosion, or a poor connection.
Test the throttle body/actuator motor; replace the throttle body if it fails or sticks.
If wiring and throttle body check out, suspect the control module/ECM.

FAQ

Quick answers

Is it safe to drive with P2108?+

Short trips are usually okay, but the car may enter reduced-power mode without warning, so avoid high-speed or heavy-traffic driving until it's fixed.

Can I just clear P2108?+

You can, and cleaning the throttle body sometimes resolves it, but if a wiring or actuator fault remains the code will return.

Read & clear P2108 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX