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Re: 2008 GMC Sierra 2500HD
Sorry for taking so long to get back to you, doing the holiday thing with the family. From what I read from both Transflow and GMC. When tieing into the purple, both the Trax gage and OEM gage will work. The purple should be the relay wire to the ECD, controlling the low fuel warning lamp. The Trax gage uses this wire to monitor and show the capacity of the stock tank. I'm going to say that you have the wrong wire, however, if you're dead sure you have the right wire, Transflow's web site has a listing for local techs or installers, you may want to give one a call. After all, it is an electrical device and they do fail even when new. Goes back to that whole "lowest" bidder thing.
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engine and engine cooling system i would overflow bottle level first my need to be topped up engine may want to be drawing in coolant but none in reservoir if not this issue search on line p2138 code gmc serria 2008 2500hd there are couple sites with different info
DTC P0700 indicates a transmission control system malfunction. Probable causes:
1. Faulty sensor or solenoid
2. Control unit software needs update
3. Faulty PCM or ECM
4. Transmission system malfunction
DTC P0708 indicates high input to the transmission range selector A circuit. Probable causes: 1. through 4. above plus
A. Damaged or corroded connector terminal contact
B. Wire harness fault. Check for correct voltage, open, short to ground, short to voltage
I have a 2008 GMC Sierra 2500HD Duramax and use the HyperTech software also. I assume you are talking about the installation instructions for HyperTech where it tells you to remove the ONStar and Radio fuse. Look in the owners manual for the fuse box layout under the hood. On mine, it's in the Duramax book and the only fuse that applies is the one listed for the Audio System. You will need to reset your clock when finished.