OBD Guide
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P1872

Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit Failure

P1872 is an OBD-II diagnostic trouble code meaning: Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit Failure. Common causes: burnt out indicator lamp, open or short circuit in wiring. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Axle lock indicator does not light up when turned on
  • The axis lock indicator is constantly on
  • The axis lock indicator is flashing
  • Unable to activate all-wheel drive mode
  • Check Engine light comes on

Causes

  • Burnt out indicator lamp
  • Open or short circuit in wiring
  • Faulty relay
  • Problems with contacts in connectors
  • Transmission control module (TCM) malfunction

How to Fix

  1. Check the indicator lamp on the dashboard
  2. Check the integrity of wiring and connectors
  3. Check relay functionality
  4. Scan the transmission control module for additional errors
  5. If necessary, replace faulty components

Related codes

P1870P1871P1873

FAQ

What does the P1872 code mean?

P1872 is an OBD-II diagnostic trouble code that indicates: Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit Failure

What causes a P1872 error code?

The most common causes of P1872 include: Burnt out indicator lamp; Open or short circuit in wiring; Faulty relay; Problems with contacts in connectors.

How do I fix a P1872 diagnostic trouble code?

To fix P1872: Check the indicator lamp on the dashboard. Check the integrity of wiring and connectors. Check relay functionality. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1872?

Yes, but get it checked soon

How much does it cost to fix P1872?

The estimated repair cost for P1872 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat