P1129high severityPowertrain
Electric Throttle Control System
on 1996 Lexus SC 300 3.0L I6 · RWD
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.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1