TCM Outputs: Overview

1999 Chrysler 300M V6-3.5L VIN GSECTION Overview
The TCM directly controls the following:
- Transmission Control Relay
- Solenoid pack
- Torque management requests to the PCM
Additionally, the TCM broadcasts the following information over the communication bus for use by other vehicle control systems:
- Communication with the DRB Scan Tool for diagnostics
- Shift lever position to the shift lever display
- Transmission oil temperature to the PCM in order to activate the cooling fans
- Vehicle speed - hardwired to PCM and PCM sends to BCM over communication bus
- Limp-in status

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.