OBD Guide
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C2506

Transmission Shift Level Position Signal Plausibility Failure

C2506 is an OBD-II diagnostic trouble code meaning: Transmission Shift Level Position Signal Plausibility Failure. Common causes: lever position sensor malfunction, open or shorted wiring harness. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • Incorrect display of lever position on the instrument panel
  • Problems with gear shifting
  • Transmission transition to emergency mode

Causes

  • Lever position sensor malfunction
  • Open or shorted wiring harness
  • Oxidation of contacts
  • Mechanical damage to the lever
  • Software error in TCM

How to Fix

  1. Diagnostics with a scanner to confirm the code
  2. Checking the integrity of the wiring harness
  3. Cleaning the sensor contacts
  4. Replacing the lever position sensor
  5. TCM flashing (if necessary)

Related codes

P0705P0706P0707

FAQ

What does the C2506 code mean?

C2506 is an OBD-II diagnostic trouble code that indicates: Transmission Shift Level Position Signal Plausibility Failure

What causes a C2506 error code?

The most common causes of C2506 include: Lever position sensor malfunction; Open or shorted wiring harness; Oxidation of contacts; Mechanical damage to the lever.

How do I fix a C2506 diagnostic trouble code?

To fix C2506: Diagnostics with a scanner to confirm the code. Checking the integrity of the wiring harness. Cleaning the sensor contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C2506?

Limited driving only, diagnose soon

How much does it cost to fix C2506?

The estimated repair cost for C2506 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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