2022 F-150, Mach-E & Lightning Pedestrian Alert Module vs. Body Control Module

Is It the Pedestrian Alert Module or the Main BCM?

Before you buy any parts, it's crucial to understand which module has failed. A mistake here can be the difference between a simple, inexpensive fix and a very costly, complicated repair. This guide covers both, so you can correctly diagnose your issue.

The Pedestrian Alert System Control Module (Part: MU5T-14G650-GAG)

This is a small, single-purpose computer. Its only function is to control the external speaker that makes noise when your vehicle is moving at low speeds. If this module fails, you will likely see a 'Pedestrian Sounder Fault' message on your dashboard, and the artificial 'hum' will no longer be present. It will not cause other electrical issues in the vehicle.

The Main Body Control Module (BCM)

The main BCM is the primary computer for the truck's body, security, and convenience features. It's a complex and expensive part that is integrated with the vehicle's anti-theft system. A failure here causes widespread and often random-seeming electrical problems.

Symptoms of a Failing Pedestrian Alert Module

Failure of the Pedestrian Alert Module is straightforward and will not affect the vehicle's drivability, only its ability to audibly alert pedestrians.

• "Pedestrian Sounder Fault" Warning: The most common symptom is a specific warning message appearing on the instrument cluster.
🎬 Watch: See what the Pedestrian Sounder Fault warning looks like.
• No Low-Speed Sound: The vehicle will be silent (besides tire noise) when moving forward at low speeds. The reverse warning chime may or may not be affected, as it can sometimes be a separate function.
• DTC U029A: A scan tool may show Diagnostic Trouble Code U029A, which means "Lost Communication With Pedestrian Alert Control Module A".

Symptoms of a Failing MAIN Body Control Module (BCM)

If you are experiencing any of the following, your problem is likely with the main BCM, not the pedestrian alert module. These issues are often intermittent at first.

• Erratic Lights: Headlights, taillights, or interior lights turning on or off by themselves, or not working at all.
• Power Window and Lock Issues: Windows that won't open or close, or door locks that cycle randomly.
• Key Fob and Alarm Problems: The vehicle may not recognize the key fob, or the alarm may go off unexpectedly.
• Parasitic Battery Drain: A faulty BCM can fail to go to 'sleep' when the vehicle is off, draining the 12-volt battery overnight.
• No-Start Condition: Because the BCM is tied into the anti-theft system, a complete failure can prevent the engine from starting.
• Multiple Unrelated Warning Lights: The dashboard may light up with various warnings that don't seem connected.
🎬 Watch: How a failed BCM causes multiple electrical problems.

Known Issues, Recalls, and TSBs (Main BCM)

The 2022 F-150, Mach-E, and Lightning have had several recalls and technical service bulletins (TSBs) that involve software updates for the main Body Control Module. If you are experiencing electrical issues, check with a Ford dealer to see if your vehicle has an open recall, as the fix may be a free software update.

• Recall 24S27 / 24V293: A BCM software calibration issue could cause one or both taillamps to stop working. The fix is a software update.
• Recall 25V340000 (F-150 Lightning): An issue where the Tire Pressure Monitoring System (TPMS) light may not illuminate when a tire is low. The fix is a BCM software update.
• Mach-E Door Latch Issue: A recall was issued for some Mach-E models where a low 12-volt battery could cause the electronic door latches to become inoperable. The fix is a BCM software update.

Programming and Installation

Pedestrian Alert Module

Based on its simple function, the Pedestrian Alert System Control Module is not expected to require programming. Replacement should be plug-and-play. This makes purchasing a used module a very cost-effective repair. The module itself is often located near the 12V battery or under the dash, while the speaker it controls is located behind the front bumper.

Main Body Control Module (BCM)

Buying a Used Module: A Tale of Two Parts

This is where correctly identifying your problem pays off.

Buying a Used Pedestrian Alert Module

This is an ideal part to buy used. Since it likely does not require programming, the replacement is simple. When buying, match the part number on your original module to the one in the listing. The part numbers MU5T-14G650-GAG, MU5T-14G650-GAF, and others are common for these vehicles. Physically inspect the used part for any signs of water damage or corrosion on the pins, but otherwise, it is a low-risk purchase.

Buying a Used Main BCM

This is high-risk and generally not recommended for a DIY repair. Most Ford dealers are unwilling or unable to program a used BCM that has another vehicle's VIN stored in it. While some advanced specialists can do it, the cost and hassle can be significant. If your main BCM has failed, your most reliable option is a new OEM part installed and programmed by a dealership.

Cost to Replace

Frequently Asked Questions (FAQ)