2020 Mitsubishi Eclipse Cross ECM: Programming, Problems, and Replacement
Replacing the engine computer in your 2020 Eclipse Cross is not a plug-and-play job. This guide explains the mandatory programming and how to buy the right used part.
- A replacement ECM (new or used) is NOT plug-and-play and MUST be programmed to the vehicle's VIN and immobilizer system.
- Programming requires a Mitsubishi-specific M.U.T.-III scan tool, typically necessitating a visit to a dealer or specialized shop.
- You must match the OEM part number 1860D573 exactly with your original module to ensure compatibility.
- A failed ECM will likely cause a no-start condition or severe drivability issues, making the vehicle unsafe to operate.
Symptoms of a Failing ECM
A faulty Engine Control Module in a 2020 Eclipse Cross can cause a variety of symptoms that are often difficult to diagnose because they can mimic other component failures. Always have a professional perform 🎬 Watch: Learn the top signs of a failing ECU a full diagnosis before condemning the ECM.
- Check Engine Light: An illuminated Check Engine Light is a primary indicator. Codes related to internal module failure (like P0602), sensor circuits, or communication errors (P1600) may be present.
- Engine Performance Issues: You may experience engine misfires, rough idling, stuttering, or a sudden loss of power. This can happen if the ECM fails to correctly manage the air-fuel mixture or ignition timing. 🎬 See this video on bad ECM warning signs
- Car Will Not Start: A complete failure of the ECM can prevent the engine from starting at all. The module controls the fuel injectors and ignition system, and if it's not working, the engine won't get the spark or fuel it needs.
- Poor Fuel Economy: A sudden and significant drop in gas mileage can be a sign of an ECM problem. If the module sends incorrect commands to the fuel injectors, the engine may run too rich, wasting fuel. 🎬 Watch: Symptoms of a bad ECU you shouldn't ignore
- Transmission Shifting Problems: The ECM communicates with the transmission control module to ensure smooth gear changes. Faulty data from the ECM can lead to harsh or erratic shifting.
Known Issues, TSBs, and Recalls
For the 2020 model year, the Eclipse Cross received a new engine ECU. While no widespread recalls exist specifically for ECM hardware failure on the 2020 model, several software-related Technical Service Bulletins (TSBs) and recalls have been issued that involve reprogramming various control units.
- TSB-20-13-002: This bulletin addresses a no-start condition where the starter doesn't engage on the first key turn, or a Check Engine Light with code P0014. The fix is to reprogram the ECM with updated software.
- Recall SR-18-007 (NHTSA 18V621000): Affecting some 2018-2019 models, this recall involved reprogramming the Forward Collision Mitigation (FCM) ECU due to a software error. While not a direct ECM failure, it highlights the importance of software in the vehicle's systems.
- TSB-20-23-001: Addresses potential transmission shudder or surge, which may store diagnostic trouble codes in the CVT ECU. Diagnosis involves using the Mitsubishi MUT-III tool to check for specific codes.
Pro Tip: Before replacing the ECM for a software-related issue, check with a Mitsubishi dealer to see if a simple reflash with the latest software version could solve the problem. This is often cheaper than a full replacement.
Buying a Used Engine Control Module (ECM)
Purchasing a used OEM ECM is a great way to save money, but it requires careful attention to detail. A new OEM module can cost over $900, while a used one is significantly less.
Warning: This module is NOT plug-and-play. It requires professional programming to your vehicle's VIN and immobilizer system. The vehicle will not start until the module is properly programmed.
- Match the Part Number Exactly: The most critical step is to verify that the part number on the replacement module matches your original one. The primary OEM part number for the 2020 Eclipse Cross is 1860D573. The alternate number is E6T87079. Do not use a module with a different number, even if it looks identical.
- Physical Inspection: When you receive the used module, inspect the case for cracks or signs of being opened. Check the connector pins to ensure none are bent, broken, or corroded. Avoid any units with signs of water damage.
- Programming is Mandatory: A used ECM was programmed to a different vehicle. It must be wiped and reprogrammed to your car's VIN and key-related immobilizer data. This process requires a Mitsubishi-specific diagnostic tool, the M.U.T.-III.
- Who Can Program It?: This is not a DIY job. Programming must be done by a Mitsubishi dealership or a well-equipped independent auto repair shop that specializes in imports and has the M.U.T.-III tool. Some advanced automotive locksmiths may also have this capability, but you must confirm with them beforehand.
Cost Breakdown
The cost to replace the ECM can vary significantly based on the price of the part and the labor for programming.
| Item | Estimated Cost |
|---|---|
| New OEM Module | $940 - $1,250 |
| Used OEM Module | $50 - $200 |
| Remanufactured Module | $250 - $500 |
| Shop Labor (Installation & Programming) | $120 - $300 |
Frequently Asked Questions (FAQ)
Can I replace the ECM myself?
You can physically swap the module yourself, as it is typically located in the engine bay and is easy to access. However, the vehicle will not start until the replacement ECM is professionally programmed to your car's VIN and immobilizer system.
Why won't my car start after installing a used ECM?
The car won't start because the used ECM is still programmed to the donor vehicle's anti-theft and immobilizer system. It does not recognize your car's keys. It must be reprogrammed by a dealer or a qualified technician with Mitsubishi-specific tools.
Can a locksmith program a Mitsubishi ECM?
Some specialized automotive locksmiths have the advanced tools (like the M.U.T.-III or equivalent) required to program Mitsubishi ECMs, but many do not. You must call and confirm they have the specific capability for a 2020 Eclipse Cross before purchasing their service.
What is the difference between an ECM, ECU, and PCM?
The terms are often used interchangeably. ECM (Engine Control Module) and ECU (Engine Control Unit) refer to the same computer that manages the engine. PCM (Powertrain Control Module) is a term for a more integrated unit that controls both the engine and the transmission in a single module. For the Eclipse Cross, the part is most commonly referred to as the ECM or ECU.
Helpful Videos
Technical Specifications
OEM Part Numbers: 1860D573 E6T87079
Controls the 1.5L 4B40 MIVEC direct-injection turbocharged engine. Requires programming with M.U.T.-III scan tool.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Mitsubishi Eclipse Cross: