2011-2012 Ford Flex & Lincoln MKT ECM: Guide to Failures, Part Numbers, and Programming

Symptoms of a Failing ECM in a 2011-2012 Flex or MKT

A failing Engine Control Module can create a wide variety of symptoms that can be difficult to diagnose, as they often mimic other problems. Be aware of multiple, seemingly unrelated issues happening at once, which can point toward the ECM as the root cause.

• Check Engine Light: The most common symptom is an illuminated Malfunction Indicator Lamp (MIL) or check engine light. The light may stay on constantly, and the codes may return immediately after being cleared.
• Engine Stalling or No-Start: The engine may stall unexpectedly while driving or fail to start at all. This can be intermittent. A complete no-start can occur if the ECM fails to power the fuel pump or send signals to the ignition system.
• Severe Engine Misfires: Rough idling, hesitation, and misfiring during acceleration can be caused by the ECM failing to properly control the ignition coils or fuel injectors.
• Drastic Drop in Performance or Fuel Economy: You may notice a sudden loss of power, poor acceleration, or a significant decrease in MPG as the ECM loses its ability to efficiently manage the engine.
• Ignition Coil Driver Fault Codes (P0351-P0356): These codes are a strong indicator of a specific and common ECM failure in these vehicles. A shorted ignition coil can damage the internal circuit (driver) within the ECM that controls it.
• Communication Codes (U-codes): If a diagnostic scan tool cannot communicate with the ECM, or if you see codes like U0100 (Lost Communication With ECM/PCM), it points to a major problem with the module itself or its power/ground wiring.
• Internal ECM Malfunction Codes: Codes such as P1608 may specifically indicate an internal fault within the module.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While there are no widespread recalls specifically for the Engine Control Module on the 2011-2012 Ford Flex and Lincoln MKT, there are critical related issues to be aware of.

Ignition Coil Failure Causing ECM Damage

The most significant known issue for these vehicles is internal ECM failure caused by a short-circuited ignition coil. The electrical feedback from a failing coil can permanently damage the corresponding driver circuit inside the ECM.

Recall 15S18: Power Steering Control Module (PSCM)

Many owners find information about recall 15S18 and confuse it with an ECM issue. This recall is for the Power Steering Control Module (PSCM), not the Engine Control Module (ECM). The recall addresses a problem where the electric power steering assist can suddenly fail, making the vehicle difficult to steer. While this is a serious issue that should be addressed, it is unrelated to the engine's computer.

Buying a Used Engine Control Module

A used OEM module is an excellent, cost-effective alternative to an expensive new unit. An original Ford part is often more reliable than a new aftermarket module, which can have software or compatibility issues. Here’s what you need to know to buy the right part.

1. Match the Part Number EXACTLY

This is the most important rule. The part number is printed on a sticker on the outside of the ECM case. While some numbers supersede others, the safest approach is to find a used module with a number that is an exact match to your original. The initial part numbers may start with AA8A or BA8A, while later service parts may start with BA8Z.

2. Verify the Engine and Drivetrain

This ECM is only for models equipped with the 3.5L EcoBoost (Turbocharged) V6 engine. It will not work with the naturally aspirated 3.5L V6. Ensure the donor vehicle had the same engine.

3. Inspect the Module

Before purchasing, carefully inspect the used ECM. Look for:

• No Corrosion: Check the aluminum case and, more importantly, the electrical connector pins for any signs of white or green corrosion.
• Intact Connectors: Ensure the pins are straight and not bent or broken.
• No Physical Damage: Avoid any units with dents, cracks, or signs that the case has been pried open.

Programming and Installation Requirements

The programming process involves two main steps:

1. VIN Programming (Flashing): A technician uses a diagnostic tool to load your car's unique 17-digit Vehicle Identification Number (VIN) into the replacement ECM. This ensures the module has the correct software and calibration files for your vehicle's specific options.
2. PATS Key Relearn: The Passive Anti-Theft System (PATS) links the ECM to your ignition keys. After the ECM is installed, the keys must be electronically relearned to the new module. If this is not done, the ECM will not allow the engine to start, believing it is being stolen.

Who Can Program the ECM?

• Ford/Lincoln Dealerships: Any dealer can perform the programming.
• Qualified Independent Shops: Many independent mechanics who specialize in Ford vehicles have the necessary tools, such as the Ford IDS or FDRS software and a J2534 pass-thru device. You should call ahead to confirm they can program a replacement Ford ECM.
• Automotive Locksmiths: Some advanced automotive locksmiths have the tools to perform the PATS key relearn portion of the job.
• Mail-In Services: Some companies offer mail-in services where you send them your original and replacement ECMs. They can clone the data from your old module to the new one. The risk is that if your original ECM's software was corrupted, that corruption will be transferred to the replacement unit.

ECM Location and Replacement

On the 2011-2012 Ford Flex and Lincoln MKT, the ECM is located in the engine compartment, under the plastic cowl panel at the base of the passenger side of the windshield.

Physical replacement involves these general steps:

1. Disconnect the battery.
2. Remove the windshield wiper arms.
3. Remove the plastic push pins holding the cowl panel in place and remove the panel.
4. The ECM will be visible. Disconnect the large electrical connectors. These have locking levers that must be released.
5. Unbolt the ECM from its mounting bracket and remove it.
6. Installation is the reverse of removal.

Cost Comparison for ECM Replacement

The total cost includes the part, installation labor, and separate programming fees. Prices are estimates and can vary by location and supplier.

Frequently Asked Questions (FAQ)