OBD Guide
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P155D

Hill Descent Control Message Counter Incorrect

P155D is an OBD-II diagnostic trouble code meaning: Hill Descent Control Message Counter Incorrect. Common causes: problems with the control unit software, hdc system sensor malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Hill Descent Control does not activate
  • The malfunction indicator light comes on
  • HDC System Intermittent Operation
  • Error message on the instrument panel display

Causes

  • Problems with the control unit software
  • HDC system sensor malfunction
  • Damage to wiring or connectors
  • HDC module failure
  • Problems with communication between modules (CAN bus)

How to Fix

  1. Diagnose the system using an OBD-II scanner
  2. Check the integrity of the wiring and connectors of the HDC system
  3. Update control unit software
  4. Check sensors associated with the HDC system
  5. If necessary, replace the HDC module

Related codes

P155EP155FC1234

FAQ

What does the P155D code mean?

P155D is an OBD-II diagnostic trouble code that indicates: Hill Descent Control Message Counter Incorrect

What causes a P155D error code?

The most common causes of P155D include: Problems with the control unit software; HDC system sensor malfunction; Damage to wiring or connectors; HDC module failure.

How do I fix a P155D diagnostic trouble code?

To fix P155D: Diagnose the system using an OBD-II scanner. Check the integrity of the wiring and connectors of the HDC system. Update control unit software. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P155D?

Yes, but get it checked soon

How much does it cost to fix P155D?

The estimated repair cost for P155D is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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