P1558
Throttle Actuator Electrical Malfunction
Severity
🔴 HighCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)
Symptoms
- Check Engine light comes on
- The engine goes into emergency mode
- Power Loss
- Unstable idle speed
- Acceleration problems
Causes
- Open or short circuit in the throttle drive circuit
- Throttle motor malfunction
- Wiring Harness Problems
- Engine control unit malfunction
- Mechanical damage to the throttle assembly
How to Fix
- Check the integrity of the wiring harness to the throttle valve
- Check resistance and voltage in the drive circuit
- Test the operation of the throttle motor
- Clean the throttle valve from carbon deposits
- If necessary, replace the throttle assembly