Ram 2500 & 3500 Power Running Board Module (2019-2024): Diagnosis, Codes, and Replacement

Symptoms of a Failing Running Board Control Module

When the running board control module begins to fail, it can cause a range of frustrating issues. However, it's important to note that many symptoms can also be caused by binding hinges or faulty motors. Always diagnose the simplest things first.

• Running boards are stuck: The steps may remain stuck in the extended or retracted position and will not move when the doors are opened or closed.
• Intermittent operation: The steps may work sometimes but not others, or one side may work while the other does not.
• Steps retract immediately: A step might deploy partially and then immediately retract, sometimes striking a passenger's leg.
• "Obstacle Detection" message: The instrument panel may display a warning that an obstacle has been detected, even when nothing is blocking the step's path. This is often caused by a seized hinge putting too much strain on the motor, which the module interprets as an obstruction.
• No response from Uconnect settings: If your truck is equipped with controls for the power steps in the Uconnect system (e.g., setting them to 'Off', 'On', or 'Deployed'), a faulty module may not respond to these commands.

Common Diagnostic Trouble Codes (DTCs)

A professional scan tool that can read manufacturer-specific Body codes (B-codes) and Communication codes (U-codes) is essential for accurate diagnosis. The most common codes associated with the Power Side Step Module (PSSM) are:

• B1DB2-13: Left Power Step Motor - Circuit Open
• B1DB3-13: Right Power Step Motor - Circuit Open
• B2128-12: Sensor Power Voltage - Short to Battery
• U0140: Lost Communication With Body Control Module. This is a general code and doesn't point directly to the running board module, but it can be stored if the module fails and disrupts the vehicle's communication network.

Diagnosing the Problem: Module, Motor, or Hinge?

The most common failure point in the Ram power running board system is not the control module, but the mechanical hinges seizing from rust and road debris. This puts immense strain on the motor, which can lead to symptoms that mimic a bad module.

1. Check Uconnect Settings: First, ensure the running boards haven't been accidentally turned off in the vehicle's Uconnect settings menu.
2. Clean and Lubricate Hinges: The pivot points on the running board linkages are exposed to the elements. Thoroughly clean them with a pressure washer and apply a high-quality spray lubricant (like a silicone or lithium grease) to all moving parts. Manually try to move the step to see if it feels stiff or gritty. Often, this simple maintenance restores function.
3. Check Fuses: Consult your owner's manual to locate and inspect the fuses related to the power running boards or body control module.
4. Scan for Codes: Use a capable scan tool to check for the specific PSSM codes listed above. A "Circuit Open" code for a specific motor points towards a wiring issue or a failed motor on that side, not necessarily the module itself.
5. Isolate the Module: If the hinges move freely and no motor-specific codes are present, but the steps are unresponsive or both sides fail simultaneously, the control module becomes a more likely suspect.

Buying a Used Running Board Control Module

For this part, a used OEM module is an excellent and cost-effective choice. Aftermarket running board kits come with their own proprietary controllers, but if you are replacing a failed factory module, a used OEM unit is the best path.

• Verify the Part Number: The most current part number is 68367399AF. This number supersedes the older part number 68367399AE. Either part number will work, but the 'AF' version is the latest revision. Always match the part number to ensure compatibility.
• Inspect the Connectors: When you receive the used module, carefully inspect the electrical connector pins. Look for any signs of corrosion (green or white powder) or bent pins. A clean connector is crucial for proper function.
• Check the Casing: Look for cracks or damage to the plastic housing. While it's a sturdy part, damage could indicate it was handled roughly during removal or that it may have been compromised by water.
• Why Used OEM is a Good Choice: A used OEM module is guaranteed to be plug-and-play with your truck's factory wiring and Uconnect system. It will behave exactly as the original part did without any surprises.

Programming and Installation

Programming is only necessary if you are adding factory power running boards to a truck that was not originally equipped with them. In that case, a dealer or a technician with advanced tools like AlfaOBD must add the sales code "MR7" to the Body Control Module (BCM) to enable the controls in the Uconnect screen.

Replacement Steps Overview

The running board control module is located in the engine bay on the driver's side, typically mounted to the inner fender well or near the firewall.

1. Disconnect the Battery: Before working on any electronic module, disconnect the negative terminal of the vehicle's battery to prevent electrical shorts.
2. Locate the Module: Open the hood and find the module on the driver's side. It's a black plastic box with several large electrical connectors.
3. Disconnect Electrical Connectors: Carefully release the locking tabs on each wiring harness connector and pull them straight out from the module.
4. Unbolt the Module: Remove the bolts or nuts holding the module to its mounting bracket.
5. Install the New Module: Bolt the replacement module into place, reconnect the electrical connectors, and finally, reconnect the battery. Test the function by opening and closing the doors.

Cost Comparison

Frequently Asked Questions (FAQ)