68242643AA | Genuine Mopar® Transmission Control Module 2012-16 Dodge Dart

1. Control Gear Shifts

• The TCM decides when and how the transmission shifts gears based on:

  • Vehicle speed

  • Engine RPM

  • Throttle position

  • Brake input

• This ensures smooth acceleration and deceleration.

2. Improve Fuel Efficiency

• By shifting gears at the right time, the TCM helps the engine run more efficiently, saving fuel.

3. Protect the Transmission

• Prevents harsh or improper shifts that could damage the transmission.

• Monitors for overheating, slipping, or mechanical problems.

4. Coordinate with the Engine

• Works with the Engine Control Module (ECM) to match engine power and transmission behavior, optimizing performance and emissions.

5. Diagnose Problems

• Stores trouble codes when transmission issues occur.

• Can trigger the check engine or transmission warning light for early detection.

1. Check Engine or Transmission Warning Light

• The TCM often triggers the check engine or transmission warning light when it detects a fault.

2. Erratic or Harsh Shifting

• Transmission may:

  • Shift too early or too late

  • Slip gears unexpectedly

  • Shift roughly or harshly

3. Stuck in a Single Gear

• The transmission may get stuck in one gear (commonly second or third).

• Known as “limp mode”, designed to prevent further damage.

4. Delayed or No Response When Shifting

• Transmission may hesitate when accelerating.

• May not respond immediately when shifting from park to drive or reverse.

5. Poor Fuel Efficiency

• Wrong shift timing or constant slipping can reduce MPG.

6. Transmission Fails to Downshift or Upshift Properly

• Difficulty accelerating or slowing down.

7. Unusual Noises

• Clunking, grinding, or whining noises during shifting can indicate TCM issues.