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2018 Navigator Power Running Boards Stuck Down or Not Deploying

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Mike T. · rep 0 · May 25, 4:30 AM · 1 replies · solved · Question

Vehicle: 2018 Lincoln Navigator Reserve

My 2018 Lincoln Navigator Reserve is having issues with the power running boards. Sometimes they get stuck in the deployed position, and other times they just won't deploy at all when I open the door. I've noticed a grinding noise a couple of times when they try to move.

It seems to be intermittent; sometimes one side works, and the other doesn't. It's really annoying, especially when they're stuck out. I've tried cleaning around them, but that hasn't helped. Has anyone else experienced this with their Navigator, and what was the fix?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:30 AM

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ClearTheCode admin answer: Power running board issues on a 2018 Lincoln Navigator are fairly common and often stem from mechanical wear, electrical problems, or environmental factors affecting the motor and sensor components.

Here are the most common causes and troubleshooting steps:

  1. Motor Failure/Wear: The most frequent cause is the electric motor that drives the running board mechanism. Over time, these motors can wear out, seize, or have internal gear failures, leading to grinding noises, intermittent operation, or complete failure. This is especially true if they've been exposed to harsh weather or debris.

  2. Sensor Issues: The running boards rely on door-ajar sensors to know when to deploy or retract. If a door sensor is faulty or its wiring is damaged, the running board module might not receive the correct signal.

    • Common DTCs related to running board operation:
      • B1B56: Running Board Motor Circuit Open/Short
      • B1B57: Running Board Motor Position Sensor Fault

  3. Wiring Harness Damage/Corrosion: The wiring to the running board motors and sensors is exposed to road grime, salt, and moisture. This can lead to corrosion or damage in the wiring harness, causing intermittent electrical connection problems.

  4. Mechanical Obstruction/Binding: While you've cleaned around them, sometimes dirt, ice, or debris can get into the pivot points or tracks of the running board mechanism, causing it to bind. Lubricating the pivot points with a silicone-based lubricant can sometimes help, but be careful not to get it on electrical connections.

  5. Control Module Glitch: The running boards are controlled by a dedicated module (often integrated into the Door Control Modules DDM/PDM or a separate running board module). A software glitch or module failure could also cause erratic behavior.

When to See a Shop:

  • If lubricating the pivot points doesn't resolve the binding.
  • If you hear grinding noises, which strongly suggest motor wear.
  • If the issue persists or worsens, especially if one side works and the other doesn't.
  • A Lincoln dealership or a shop specializing in automotive electrical systems can diagnose the exact fault. They can check for specific DTCs, test the motors, inspect the wiring, and determine if a motor replacement, sensor adjustment, or module repair is needed. Given the complexity and exposure to elements, professional diagnosis is recommended.
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