Throttle Actuator Control Throttle Body Range/Performance
The PCM detected that the electronic throttle body is not responding properly or is outside its expected operating range. This causes the engine control system to enter failsafe mode, restricting throttle operation and limiting engine performance to prevent damage.
What You Might Notice
- Engine will not start or has difficulty starting
- Little to no throttle response when pressing accelerator
- Poor engine performance and loss of power
- Check Engine Light illuminated
- Increased fuel consumption
Most Common Causes
- 1
Throttle body malfunction
The electronic throttle body actuator is stuck, damaged, or electrically failing. This prevents proper throttle blade movement and causes the PCM to detect an out-of-range signal.
- 2
Throttle position sensor failure
The throttle position sensor (TPS) is sending incorrect signals to the PCM, causing it to believe the throttle is in an invalid position and triggering failsafe mode.
- 3
Wiring or connector issues
Loose, corroded, or damaged wiring and connectors in the throttle control circuit are interrupting communication between the PCM and throttle actuator.
- 4
PCM or throttle control software issue
The PCM may have a software glitch or the throttle control module may be malfunctioning, causing incorrect throttle range calculations and failsafe activation.
How to Diagnose It
- 1
Check Throttle body malfunction — The electronic throttle body actuator is stuck, damaged, or electrically failing. This prevents proper throttle blade movement and causes the PCM to detect an out-of-range signal.
- 2
Check Throttle position sensor failure — The throttle position sensor (TPS) is sending incorrect signals to the PCM, causing it to believe the throttle is in an invalid position and triggering failsafe mode.
- 3
Check Wiring or connector issues — Loose, corroded, or damaged wiring and connectors in the throttle control circuit are interrupting communication between the PCM and throttle actuator.
- 4
Check PCM or throttle control software issue — The PCM may have a software glitch or the throttle control module may be malfunctioning, causing incorrect throttle range calculations and failsafe activation.
How to Fix It
- 1
Inspect and clean throttle body
Remove the throttle body and inspect it for carbon buildup, debris, or mechanical damage. Clean it thoroughly with throttle body cleaner and check that the throttle blade moves freely.
- 2
Check throttle position sensor
Test the TPS with a multimeter to verify it's sending proper voltage signals as the throttle is moved. Replace the sensor if readings are inconsistent or outside specification.
- 3
Inspect wiring and connectors
Check all throttle control system wiring for damage, corrosion, or loose connections. Clean corroded connectors with contact cleaner and ensure all plugs are fully seated.
- 4
Replace throttle body assembly
If the throttle body is mechanically damaged or the actuator cannot be repaired, replace the entire electronic throttle body assembly with an OEM or quality replacement unit.
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