Looking for..... involving a trans swap, 2009 Pontiac G8 GT.

[Willie]

.... either a file for a 2009 Pontiac G8 GT with a 6.0L (with DOD) and a manual transmission. This combo does not exist in the states, only Australia, where it would be very common.

I recently swapped a manual trans for the 6L80e. Although I tune, my experience is limited to Ford, so I enlisted a tuner friend of mine who does only GM's. I gave him copies of everything I could find from others who have made the swap and the do's and dont's. Unfortunately, I do not believe he read any of it and proceeded to do things his way. The result is now a locked PCM. I know he used a GXP file from the repository which had a manual trans option, but this is not the same engine and from my research on the VIN he used, this car is an automatic. So now he's telling me I need a new PCM....

I'm at a loss as to what I should do.

[Shrek]

Without you posting the original E38 calibration from the L76 6.0L, or the VIN from the vehicle, the following is only a possibility - and may not be what actually happened.

The 2009 model year for the Pontiac G8 GT was a mix of both ECM calibrations and hard parts.

The early production models with the L76 engines were actually 2008 model carryovers. They used a 2008 E38 ECM, with 2008 programming (OS 12624402), and the 2008 "silver blade" throttle body.

Midyear these transitioned to using a 2009 E38 ECM (different service number), with a 2009 OS (12633016), and the new "gold blade" throttle body.

All of the G8 GXP models (LS3 6.2L manual transmission) were fully 2009s from the outset - using all 2009 parts and programming (12633016).

If your tuner flashed a 2009 G8 GXP calibration (12633016) over an existing early G8 GT calibration (12624402) - then this would have bricked the E38 ECM.

[Willie]

Without you posting the original E38 calibration from the L76 6.0L, or the VIN from the vehicle, the following is only a possibility - and may not be what actually happened.

The 2009 model year for the Pontiac G8 GT was a mix of both ECM calibrations and hard parts.

The early production models with the L76 engines were actually 2008 model carryovers. They used a 2008 E38 ECM, with 2008 programming (OS 12624402), and the 2008 "silver blade" throttle body.

Midyear these transitioned to using a 2009 E38 ECM (different service number), with a 2009 OS (12633016), and the new "gold blade" throttle body.

All of the G8 GXP models (LS3 6.2L manual transmission) were fully 2009s from the outset - using all 2009 parts and programming (12633016).

If your tuner flashed a 2009 G8 GXP calibration (12633016) over an existing early G8 GT calibration (12624402) - then this would have bricked the E38 ECM.

....which is exactly what happened. So the ECM (12624402) was replaced with a 12633016 and tuned with a GXP VIN. Then the tuner changed the appropriate engine values and she runs as she did before, but...

the speedo does not work. I have a few questions regarding this.

1) When the tuner installed the GXP calibration and VIN, he said the BCM was also changed. Does changing only the VIN also change the calibration to a manual trans?

2) How about the instrument cluster? Does it need to be programmed to the same VIN and / or manual trans?

I think all this could have been avoided if he had access to a Holden file for a 6.0L and a manual transmission, a combo that was never sold in the U.S.

Thanks. I'm learning a lot.

[TheMechanic]

This "MAY" help.
https://forum.hptuners.com/showthrea...onversion-help