OBD Guide
ENFRDEESPT

P1588

Throttle Control Unit Detected Loss of Return Spring

P1588 is an OBD-II diagnostic trouble code meaning: Throttle Control Unit Detected Loss of Return Spring. Common causes: broken or worn return spring, incorrect spring installation. Estimated repair cost: $6–28.

Severity
🔴 High
Can 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

  1. Visual inspection of the return spring
  2. Checking the throttle mechanism for sticking
  3. Replacing the return spring if necessary
  4. Checking and resetting control unit errors
  5. Test drive to check troubleshooting

Related codes

P0122P0123P0222P0223

Error P1588 by Vehicle Brand

BuickCadillacChevroletChryslerFordGMGMCLincolnMercuryOldsmobileSaturnVolkswagen

FAQ

What does the P1588 code mean?

P1588 is an OBD-II diagnostic trouble code that indicates: Throttle Control Unit Detected Loss of Return Spring

What causes a P1588 error code?

The most common causes of P1588 include: Broken or worn return spring; Incorrect spring installation; Throttle valve sticking; Malfunction of the throttle control unit.

How do I fix a P1588 diagnostic trouble code?

To fix P1588: Visual inspection of the return spring. Checking the throttle mechanism for sticking. Replacing the return spring if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1588?

Do not drive — repair immediately

How much does it cost to fix P1588?

The estimated repair cost for P1588 is $6–28. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat