P1129 Electric Throttle Control System Malfunction
What does P1129 mean on a Toyota?
P1129 — Electric Throttle Control System Malfunction. This Toyota-enhanced code applies to Camry, Corolla, RAV4, Highlander with ETCS-i.
Common causes of P1129
- General ETCS-i system fault
- Throttle body carbon buildup
- Pedal or throttle sensor disagreement
- Low system voltage
- Failing throttle body
How to fix P1129
- Read companion ETCS codes to isolate the fault
- Clean the throttle body
- Verify battery and charging voltage
- Test pedal and throttle correlation
- Replace the throttle body per findings