OBD Guide
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P1731

A/T 1st Engine Braking

P1731 is an OBD-II diagnostic trouble code meaning: A/T 1st Engine Braking. Common causes: wheel speed sensor malfunction, engine brake solenoid valve problems. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Erratic gear shifting
  • Reduced engine braking efficiency
  • Check Engine Light Illuminates
  • Problems with acceleration in first gear

Causes

  • Wheel speed sensor malfunction
  • Engine Brake Solenoid Valve Problems
  • TCM malfunction
  • Wiring harness damage
  • Low transmission fluid level

How to Fix

  1. Check the level and condition of the transmission fluid
  2. Diagnose the wheel speed sensor
  3. Check engine brake solenoid valve
  4. Scan TCM for errors
  5. Inspect the wiring harness for damage

Related codes

P1732P1729P1730

Error P1731 by Vehicle Brand

FordJaguarLincolnMercury

FAQ

What does the P1731 code mean?

P1731 is an OBD-II diagnostic trouble code that indicates: A/T 1st Engine Braking

What causes a P1731 error code?

The most common causes of P1731 include: Wheel speed sensor malfunction; Engine Brake Solenoid Valve Problems; TCM malfunction; Wiring harness damage.

How do I fix a P1731 diagnostic trouble code?

To fix P1731: Check the level and condition of the transmission fluid. Diagnose the wheel speed sensor. Check engine brake solenoid valve. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1731?

Yes, but get it checked soon

How much does it cost to fix P1731?

The estimated repair cost for P1731 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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