OBD Guide
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P172A

Auxiliary Transmission Fluid Pump Reverse Rotation

P172A is an OBD-II diagnostic trouble code meaning: Auxiliary Transmission Fluid Pump Reverse Rotation. Common causes: incorrect pump installation, electrical wiring problems. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Uneven transmission operation
  • Delays when shifting gears
  • Transmission overheating
  • Check Engine light comes on
  • Reduced transmission efficiency

Causes

  • Incorrect pump installation
  • Electrical wiring problems
  • Malfunction of the pump itself
  • Problems with the transmission control unit
  • Mechanical damage to the pump

How to Fix

  1. Check that the pump is installed correctly
  2. Diagnose the electrical circuit of the pump
  3. Check pump operation
  4. Replace the pump if necessary
  5. Check and update transmission control unit software

Related codes

P172BP172CP172D

FAQ

What does the P172A code mean?

P172A is an OBD-II diagnostic trouble code that indicates: Auxiliary Transmission Fluid Pump Reverse Rotation

What causes a P172A error code?

The most common causes of P172A include: Incorrect pump installation; Electrical wiring problems; Malfunction of the pump itself; Problems with the transmission control unit.

How do I fix a P172A diagnostic trouble code?

To fix P172A: Check that the pump is installed correctly. Diagnose the electrical circuit of the pump. Check pump operation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P172A?

Do not drive — repair immediately

How much does it cost to fix P172A?

The estimated repair cost for P172A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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