⚠️ What Are the Dangers of Using Used Modules on Chrysler, Dodge, Jeep, and RAM Vehicles?
Using used modules on Chrysler, Dodge, Jeep, and RAM vehicles might seem like a cost-saving shortcut, but it can create major diagnostic issues—especially on certain vehicles that strictly do not support used modules. While some Stellantis vehicles can safely accept used control modules, others absolutely should not. In those cases, installing a used module doesn’t just fail—it can compromise the rest of the vehicle.
Click Here --> Stellantis Vehicles That Cannot Use Used Modules
🚨 Why It’s Dangerous
On vehicles that don’t allow used modules, installing one can trigger a serious issue:
The VIN from the used module can propagate or "spread" to other modules on the vehicle.
Here’s what that means:
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The old VIN stored in the used module can overwrite the correct VIN in other modules.
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Once the wrong VIN has spread across multiple modules, you can’t change it back—even with OEM tools.
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This can result in VIN mismatch errors, failed security authentication, immobilizer lockouts, and more.
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Ultimately, you’ll have to replace multiple modules, not just the one you started with.
🧯 Real-World Consequences
Technicians often go into the job expecting to replace one module—but end up needing to replace:
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Powertrain Control Module (PCM)
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Body Control Module (BCM)
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Instrument Cluster
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Wireless Control Module (WCM)
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And potentially others
What began as a simple used part installation turns into an expensive, time-consuming repair involving multiple new modules and sometimes a new VIN write from the dealer—if it’s even recoverable.