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2007 RAM 3500
5.9L I6 Cummins•4WD•diesel•ISB•turbo
1 active safety recall on this vehicle — view recalls🏆Sponsored by Timmehster
Repairs487Labor523Torque138Fluid11DTC1714Battery1Maintenance0Recalls1
P0800moderate severityPowertrain

Transmission Control System (MIL Request)

on 2007 Ram 3500 5.9L I6 Cummins · 4WD

What this code means

The transmission control module has detected a fault and is requesting the malfunction indicator lamp be illuminated. This is a general communication code indicating the TCM wants to alert the driver to a transmission issue.

Symptoms

  • Check engine light on
  • Transmission warning light
  • Possible shifting problems

Common causes

  • Faulty transmission control module
  • Wiring or connector fault between TCM and PCM
  • Stored transmission fault triggering MIL request
  • Poor ground connection

Diagnostic steps

  1. Scan for all stored transmission codes
  2. Address any accompanying transmission DTCs first
  3. Inspect TCM-to-PCM wiring and connectors
  4. Verify module grounds and power supply
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