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P0748 Allison 5sd (3rd GEN TCM) NSBU (12 Pin)
Update Sol-A Resistance w/in SPEC A 5.5ohms Did find NSBU GND was ran into J-2 PIN 20 (Analog GND). GM Calls out for NSBU GND Circuit 251 to be ran directly to GND-Zone 2A (Frame), Not into TCM. Changed tht.- james902
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- Forum: Mike L's Trans Talk
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P0748 Allison 5sd (3rd GEN TCM) NSBU (12 Pin)
Hi Guys! I've been chasing SUBJECT issue on a Customer's Truck for weeks now. 2006 Chevy C6500 7.8L (LG4), Miles 250k. Allison 2500HS LCT New TCM via Allison (previous CRASHED wouldn't even COMM during Bench Test with Allison DOC) Reman VB via Allison (Entire assembly, Internal Harness...- james902
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- Replies: 1
- Forum: Mike L's Trans Talk