OBD Guide
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P179B

Transmission Range State Command Signal Message Counter Incorrect

P179B is an OBD-II diagnostic trouble code meaning: Transmission Range State Command Signal Message Counter Incorrect. Common causes: transmission control module (tcm) malfunction, problems with the can bus. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Incorrect gear shifting
  • Check Engine Light Illuminates
  • Transmission transition to emergency mode
  • Loss of engine power
  • Problems starting the engine

Causes

  • Transmission control module (TCM) malfunction
  • Problems with the CAN bus
  • Open or short circuit in the data transmission circuit
  • Low battery
  • Software error in control module

How to Fix

  1. Check battery condition and charging
  2. Diagnose the CAN bus for errors
  3. Check the integrity of the wiring harness to the TCM
  4. Scan the TCM for errors
  5. If necessary, replace or reflash the TCM module

Related codes

P179AP179CP179D

FAQ

What does the P179B code mean?

P179B is an OBD-II diagnostic trouble code that indicates: Transmission Range State Command Signal Message Counter Incorrect

What causes a P179B error code?

The most common causes of P179B include: Transmission control module (TCM) malfunction; Problems with the CAN bus; Open or short circuit in the data transmission circuit; Low battery.

How do I fix a P179B diagnostic trouble code?

To fix P179B: Check battery condition and charging. Diagnose the CAN bus for errors. Check the integrity of the wiring harness to the TCM. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P179B?

Limited driving only, diagnose soon

How much does it cost to fix P179B?

The estimated repair cost for P179B is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat