1997 Concorde, Intrepid, LHS & Vision Transmission Module: A Plug-and-Play Fix for Shifting Problems

Is This a BCM or a TCM? A Critical Distinction

Many owners and even some parts listings confuse the Body Control Module (BCM) with the Transmission Control Module (TCM). For these 1997 Chrysler LH-platform vehicles—the Chrysler Concorde, Dodge Intrepid, Chrysler LHS, and Eagle Vision—they are two separate computers with very different jobs. The BCM handles interior and exterior electronics like lights, power windows, door locks, and the instrument cluster. The TCM, the part covered in this guide, is dedicated solely to managing the automatic transmission's shifting behavior. If your car has shifting problems, the TCM is the likely culprit, not the BCM.

Symptoms of a Failing 1997 Transmission Control Module

A failing TCM will cause noticeable transmission issues. Because the failure is often electronic, symptoms can be intermittent at first before becoming permanent. Look for:

• Stuck in "Limp-In" Mode: The most common symptom. The transmission will get stuck in second gear to prevent further damage. This allows you to "limp" home or to a shop, but acceleration will be very poor, and you won't be able to exceed 30-40 MPH.
🎬 Watch: Understanding limp mode symptoms and how to get home.
• Harsh or Erratic Shifting: You may experience hard, jerky shifts, or the transmission may seem to hunt for the right gear.
• Failure to Shift: The car may not shift out of first gear or may refuse to downshift when you come to a stop.
• Check Engine Light: A TCM failure will almost always trigger the Check Engine Light.

The Most Important Step: Autostick vs. Non-Autostick

Before buying a replacement TCM, you must verify if your vehicle is equipped with the Autostick feature. Autostick was Chrysler's system that allowed the driver to manually select gears by tapping the shifter left or right. Vehicles with Autostick use a different TCM than those without it. This guide and the associated part numbers are for vehicles WITHOUT the Autostick feature. Check your shifter and instrument panel to confirm which system you have.

Buying a Used 1997 TCM: What to Look For

Buying a used TCM for these vehicles is a great way to save money, especially since they are reliable and do not require programming. Here’s what to check:

• Match the Part Number Exactly: The surest way to guarantee compatibility is to match the part number from your original TCM. Remove your old unit first to read the number on the sticker. Common part numbers for non-Autostick models include 04606455AB, 04606455AC, and others.
• Verify Non-Autostick: Double-check with the seller that the module came from a vehicle without the Autostick feature.
• Inspect the Connectors: Look at the pins in the electrical connectors. They should be clean, straight, and free of any green or white corrosion. Corrosion indicates water damage, and the module should be avoided.
• Check the Casing: Avoid any modules with cracked or damaged casings, as this could indicate physical trauma that has harmed the internal circuit board.

Programming: The Good News for 1997 Models

Unlike modules in newer vehicles, the TCM for the 1997 Concorde, Intrepid, LHS, and Vision is plug-and-play. It does not need to be programmed, flashed, or coded to your vehicle's VIN. You do not need to visit a dealer or a locksmith. As long as you install a compatible, functional TCM, the vehicle will operate correctly immediately after installation. 🎬 Watch: Five ways to reset your Chrysler transmission control module. This makes it an excellent DIY-friendly repair.

Step-by-Step Replacement Guide

Replacing the TCM is straightforward. It is located in the engine bay on the driver's side, mounted to the back of the Power Distribution Center (the under-hood fuse box).

1. Disconnect the Battery: Always disconnect the negative battery terminal before working on any electronic components.
2. Locate the TCM: Open the hood and find the fuse box on the driver's side, near the firewall. The TCM is the computer module attached to it.
3. Disconnect Electrical Connectors: The main wiring harness connectors are secured with a bolt in the center. As you loosen the bolt, it will slowly and safely push the connector off the module. There are typically four connectors to remove. It's a good idea to label them to avoid confusion, though they are often color-coded or keyed to only fit in the correct spot.
4. Unbolt the Module: The TCM is held to the fuse box assembly with a few bolts. Remove these bolts and carefully separate the old TCM.
5. Install the New TCM: Bolt the replacement TCM into place. Reconnect the electrical connectors, making sure they are fully seated. Tightening the center bolt will draw the connector in securely.
6. Reconnect the Battery: Reattach the negative battery terminal. Start the car and test drive to ensure all shifting issues are resolved.

Associated OBD-II Trouble Codes

A scan tool can help confirm a TCM issue. The most common code is:

• P0700 - Transmission Control System Malfunction: This is a generic code indicating that the TCM has detected a fault and has requested the Check Engine Light to be turned on. It tells you to scan the TCM for more specific codes.
🎬 See this guide on diagnosing and fixing the P0700 code.

Other related codes you might find include communication errors or specific solenoid performance codes:

• P1698: No CCD Messages Received From PCM (Powertrain Control Module).
• P1756: Governor Pressure Not Equal To Target.
• P1762: Governor Pressure Sensor Offset Improper Voltage.

Other Common 1997 LH Platform Issues

While you're working on your vehicle, be aware of another significant issue affecting these cars:

• Fuel Rail Leak Recall (NHTSA 98V-184): Vehicles with the 3.5L engine were recalled for fuel rail O-rings that could degrade and leak fuel, creating a fire risk. Ensure this recall has been performed on your vehicle. You can check with a Chrysler/Dodge dealer.

Replacement Cost Comparison

Frequently Asked Questions (FAQ)