Electric Throttle Control System
2011-2011 Toyota Highlander 3.5L V6
The 2011 Toyota Highlander is equipped with a 3.5L V6 engine. Below you'll find detailed p1129 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
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
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1129 on Other Vehicles
Common Questions
What does code P1129 mean on a 2011-2011 Toyota Highlander?
P1129 stands for "Electric Throttle Control System". A general fault detected in the Electronic Throttle Control System.
What are the symptoms of P1129 on a Toyota Highlander?
Common symptoms of P1129 include: CEL, Failsafe mode, Reduced power, Erratic throttle.
What causes P1129 on a 2011-2011 Toyota Highlander?
Common causes of P1129 include: Multiple ETCS failures, Wiring issues, ECM malfunction, Throttle body failure.
Last updated: March 2026
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