2012 Dodge Charger & Chrysler 300 3.6L ECM: A Guide to VIN Programming and Replacement
Replacing the Engine Control Module in your 2012 Charger or 300 requires mandatory VIN programming to avoid a no-start condition—here's what you need to know.
- VIN programming is mandatory. A replacement ECM must be flashed to your car's VIN to disable the anti-theft system, otherwise the engine will not start.
- Consider buying a 'plug-and-play' module from a reputable online vendor that pre-programs it with your VIN before shipping.
- Rule out other common issues first, such as the recalled alternator or ABS/ESC fuse, as their failure symptoms can mimic a bad ECM.
- Even with a VIN-programmed ECM, you may still need a locksmith or dealer to reprogram your keys to the new module.
Symptoms of a Failing ECM
A failing ECM in a 2012 Dodge Charger or Chrysler 300 can cause a wide range of confusing and intermittent issues. Because the ECM controls so many different systems, symptoms can often be mistaken for other problems. Here are the most common signs that your engine computer may be at fault:
🎬 Watch: A detailed breakdown of common bad ECM symptoms.- Complete No-Start or Intermittent Starting: The engine may crank but refuse to start, or it may start sporadically. This happens when the ECM fails to send the correct signals for spark or fuel injection.
- Engine Stalling: The engine may stall unexpectedly while driving or when coming to a stop.
- Check Engine Light with Specific Codes: While many issues can trigger a check engine light, codes related to the module's internal processor are a strong indicator of failure. Key codes to look for include P0601 (Internal Control Module Memory Check Sum Error) and P0606 (ECM/PCM Processor Fault).
- Poor Engine Performance: You may notice a significant loss of power, sluggish acceleration, or poor fuel economy as the ECM can no longer manage the engine efficiently.
- Erratic Transmission Shifting: The ECM communicates with the transmission to control shifting. A faulty module can cause harsh, delayed, or incorrect gear changes.
- No Communication with Scan Tool: In some cases, a complete failure will prevent a diagnostic scan tool from communicating with the ECM at all.
Warning: Before replacing the ECM, rule out other potential causes. The 2011-2014 Charger and 300 were subject to recalls for alternator failure and an overheating ABS/ESC fuse, both of which can cause electrical issues that mimic ECM failure. Always have a professional diagnose the issue to confirm the ECM is the root cause.
Buying a Used Engine Control Module (ECM)
Purchasing a used OEM ECM is a cost-effective way to get your vehicle back on the road, but it's critical to understand the requirements. Unlike a simple mechanical part, you cannot just swap in a used ECM from another vehicle and expect it to work.
1. Part Number Matching is Essential
First, ensure the part number on the replacement module matches your original. The primary OEM part number for this application is 05150609AC (or 5150609AC). You may also see the remanufactured part number, RL150609AC. While other part numbers may exist, sticking to the exact number from your original unit is the safest way to ensure hardware compatibility.
2. VIN Programming is NOT Optional
These vehicles are equipped with a Sentry Key Immobilizer Module (SKIM), an anti-theft system that prevents the engine from starting unless the VIN stored in the ECM matches the VIN stored in the other vehicle modules. If you install an ECM with a mismatched VIN, the vehicle will not start.
You have two main options when buying a used module:
- Buy a Pre-Programmed Module: Many online retailers specialize in selling used and remanufactured ECMs that are pre-programmed to your vehicle's VIN before they are shipped. You provide your VIN at the time of purchase, and they flash the module so it arrives ready for a "plug-and-play" installation. This is often the easiest path for DIY repair. 🎬 See how to program a new engine computer yourself.
- Buy a Used Module and Have it Programmed Locally: You can purchase a used ECM from a salvage yard and take it to a dealership or a qualified independent shop to have it programmed to your car. This may or may not be cheaper, depending on local labor rates for programming. Be aware that some shops may refuse to program a customer-supplied used part.
3. Key Reprogramming May Still Be Necessary
Even with a VIN-programmed ECM, some sources indicate that the vehicle's keys may need to be reprogrammed to the "new" module. This is part of the Passive Anti-Theft System (PATS). This procedure typically requires a visit to a dealership or an automotive locksmith with the appropriate diagnostic tools. It's a good idea to budget for this possibility.
Known Issues, Recalls, and Technical Service Bulletins (TSBs)
While there are no direct recalls for ECM failure on these models, several related issues can cause similar symptoms and lead to a misdiagnosis.
- NHTSA Recall 16V240000: This recall addresses a software issue in the Transmission Control Module (TCM) related to the monostable gear selector, which could allow the vehicle to roll away if the driver exits without it being in Park. The fix is a software update. It does not relate to engine performance issues.
- NHTSA Recall 12V197000: Affecting 2011-2012 models, this recall was for an overheating fuse in the Power Distribution Center that could disable the ABS and Electronic Stability Control (ESC) systems. A loss of these systems could be mistaken for a major computer failure.
- NHTSA Recall 14V634000: Certain 2011-2014 models with the 3.6L engine were recalled for alternators that could suddenly fail. An alternator failure will cause the battery to drain and can lead to stalling, no-start conditions, and other strange electrical behavior that points toward a bad ECM. Always test the charging system before replacing the ECM.
Cost Breakdown for ECM Replacement
Prices can vary significantly based on the source of the part and labor rates. Here is a general estimate:
| Item | Estimated Cost |
|---|---|
| New OEM (Dealer) | $625 - $850 (plus core charge) |
| Remanufactured / Used OEM (Pre-Programmed) | $150 - $350 |
| Shop Labor (Physical Swap) 🎬 Watch this walkthrough on how to replace the ECU. | $75 - $110 |
| Shop Labor (Programming Only) | $100 - $200 |
Frequently Asked Questions (FAQ)
Do I have to get this ECM programmed?
Yes, absolutely. The module must be programmed with your vehicle's VIN to communicate with the anti-theft system. Without programming, the engine will not start. Many online sellers offer pre-programming services to make the installation plug-and-play.
Can an independent mechanic or locksmith program this ECM?
Often, yes. A well-equipped independent shop or an automotive locksmith with modern diagnostic and pass-through programming tools can program a new or used ECM to your vehicle. However, not all shops have this capability, so you must confirm with them beforehand. A dealership can always perform the programming.
Where is the ECM located on the 2012 Charger and 300?
The ECM is located in the engine compartment. On the Chrysler 300, it is typically found on the driver's side, near the firewall or fuse box. The location is similar on the Dodge Charger.
What's the difference between an ECM, PCM, and ECU?
The terms are often used interchangeably. ECM stands for Engine Control Module, and ECU for Engine Control Unit. PCM, or Powertrain Control Module, is often used when the computer controls both the engine and the automatic transmission, which is the case for these vehicles. For all practical purposes, they refer to the same part.
Helpful Videos
Technical Specifications
OEM Part Numbers: 05150609AC 5150609AC RL150609AC
For use with 3.6L V6 Pentastar engine. Requires VIN programming and potential key reprogramming.
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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.
- Dodge Charger:
- Chrysler 300:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Symptoms of a Failing ECM
- Buying a Used Engine Control Module (ECM)
- 1. Part Number Matching is Essential
- 2. VIN Programming is NOT Optional
- 3. Key Reprogramming May Still Be Necessary
- Known Issues, Recalls, and Technical Service Bulletins (TSBs)
- Cost Breakdown for ECM Replacement
- Frequently Asked Questions (FAQ)
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