P1588
Throttle Control Unit Detected Loss of Return Spring
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$6–28 (est.)
Symptoms
- Engine does not return to idle
- Floating engine speed
- The gas pedal does not return to its original position
- Increased idle speed
- Check Engine light comes on
Causes
- Broken or worn return spring
- Incorrect spring installation
- Throttle valve sticking
- Malfunction of the throttle control unit
- Damage to the throttle mechanism
How to Fix
- Visual inspection of the return spring
- Checking the throttle mechanism for sticking
- Replacing the return spring if necessary
- Checking and resetting control unit errors
- Test drive to check troubleshooting