Easiest way to reprogram VIN on new PCM-‘17 Ram

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Crewguy498

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Bought a PCM from EBay. Unit came with correct mileage but wrong VIN. Truck runs fine but has engine light on. What is easiest way to get this corrected?
 

danielmid

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I think that's an unlocker/tuner thing, Alfa can't do it as far as I know. Have you checked the codes? Is the code related to the VIN?
 

jws123

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You would need a really good scanner i paid like $3000 for mine can program ecm's I am suprised the truck runs without any programming but howcome you replaced the PCM?
 
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Crewguy498

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You would need a really good scanner i paid like $3000 for mine can program ecm's I am suprised the truck runs without any programming but howcome you replaced the PCMProblem started
Started out as cyl. 3 misfire. Found broken wires near that coil connector, on the PCM side. Once repaired the coil and injector was getting shut down milliseconds after cranking. We could not figure out how to test the PCM. We rolled the dice and purchased a PCM off eBay. Engine runs fine.
 
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Crewguy498

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You would need a really good scanner i paid like $3000 for mine can program ecm's I am suprised the truck runs without any programming but howcome you replaced the PCM?
Would a HP Tuner interface allow me to alter the VIN?
 

John Jensen

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Here's how to write Vin # to ECM with AlphaOBD
 

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  • 0-Flashing VIN number to another ECU - JFJ Ecodiesel.pdf
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Crewguy498

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UPDATE:
The seller could not say why the VIN change did not take when the PCM was re programmed before shipping to me. After son drove the Ram for a few days the “engine” light stopped. Truck is running fine!
 

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