What is CID 151 & How to Solve It?

Understand what CID 151 means, its causes, and follow our steps to resolve it quickly and get your equipment back in action.

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Table of Content

What is CID 151:

CID 151 refers to a problem with the vehicle's transmission system. The ECM detects a malfunction in the transmission control module (TCM), which can cause poor shifting, loss of acceleration, or failure to engage gears properly.

Why This Happens:

  • Faulty transmission control module (TCM).
  • Shorted or damaged wiring in the TCM circuit.
  • Low transmission fluid levels.
  • Loose or corroded connectors.
  • ECM failure to properly interpret TCM data.

How to Fix It:

  1. Inspect the TCM for faults or damage.
  2. Check wiring and connectors for visible damage or corrosion.
  3. Ensure proper transmission fluid levels and condition.
  4. Reprogram or replace the TCM if necessary.
  5. Perform a full system diagnostic check to ensure proper transmission operation.

How to Avoid It Before It Happens:

  • Perform regular transmission system checks.
  • Inspect transmission fluid levels regularly.
  • Keep connectors clean and secure.
  • Perform routine diagnostics to monitor TCM health.
  • Clue’s fleet management software helps monitor transmission systems to prevent shifting or performance issues.

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