P1129high severityPowertrain
Electric Throttle Control System
on 2012 Toyota Matrix 2.4L I4 · FWD
What this code means
A general fault detected in the Electronic Throttle Control System.
Symptoms
- CEL
- Failsafe mode
- Reduced power
- Erratic throttle
Common causes
- Multiple ETCS failures
- Wiring issues
- ECM malfunction
- Throttle body failure
Diagnostic steps
- Run full ETCS diagnostics
- Check all related sensors
- Inspect wiring
- Test ECM outputs
Repair notes
Diagnose and repair specific ETCS component.
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