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View Full Version : Changing DSP5 tune to match stock VIN


FBJR
June 4th, 2015, 03:44 PM
OK, had EFI for years, pretty darn happy with and have the DSP5 with IRob tuning. (2006 LBZ) Have all but the latest firmware loaded.

Where I live they now read the PCM when doing an emissions check. However since I have the DSP5 tune it does not show the correct vin so it will not read into the system. Upon flashing all to stock, it passed fine.

My #1 tune is stock but can change the vin# on the PCM to read the same as the stock tune while keeping my DSP5 tune?

I did do a search but I didn't find anything or searched wrong. Any help would be great!!
GMC-2002-Dmax
June 4th, 2015, 11:53 PM
The OS number is altered when a DSP5 is flashed in, so even though you have a "stock" set of tables in your DSP5 tune the OS is a different number when it is a DSP5 conversion.

Probably just flash back to stock when you need a test for emissions
ScarabEpic22
June 5th, 2015, 05:42 AM
First off, do you have a FlashScan or an AutoCal? If you have a FlashScan, we can guide you through changing the VIN. With an AutoCal, we can try but I dont know if we can do it.

Easiest plan would be to flash back to stock tune (that contains the correct VIN) or have your tuner (IdahoRob) create a new tune that has your correct VIN.
GMC-2002-Dmax
June 5th, 2015, 08:58 AM
The VIN does not change with a DSP5 flash the OS Number changes
S Phinney
June 7th, 2015, 11:35 AM
If the VIN didn't match it would not start. It has to communicate with other modules like the bcm and security would prevent it from starting. Like Tony said the VIN is correct in your DSP tune but the OS changes. Emission guys wouldn't know what it is unless they knew how EFI live worked .
ScarabEpic22
June 8th, 2015, 06:00 AM
The VIN does not change with a DSP5 flash the OS Number changes

True, now that you mention this even flashing in a tune with the wrong VIN wont change it (think some Cummins are different)...


If the VIN didn't match it would not start. It has to communicate with other modules like the bcm and security would prevent it from starting. Like Tony said the VIN is correct in your DSP tune but the OS changes. Emission guys wouldn't know what it is unless they knew how EFI live worked .

Maybe the LBZ ECM is different, but the gas ECMs will start just fine if the VIN is wrong. I've tested it on my own vehicles. The OP asked about the VIN changing, not the OS #.

OP, appears the only plan is to flash back to a tune with the stock OS since they're checking the OS #.
GMPX
June 8th, 2015, 10:28 AM
Pretty sure none of GM's security systems are based off the VIN.
S Phinney
June 8th, 2015, 01:01 PM
I has a problem with a 01 lb7. Now it could have been that the customer tried a different ecm and a serial number mismatch caused it and not the Vin but it happened. I put the original back in it and did a relearn on the vats and all was good.
GMPX
June 8th, 2015, 03:13 PM
2001 LB7 ECM's are very, very temperamental.