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So last 4-5 days I'd start my 06 SC L322 and let it warm up for 10 min. Jump in and start driving, either immediately or within 5mins of driving it would throw HDC fault and range change (transfer case) and sometimes but not always tranny fault limited gears. I cleared the codes, shut it off and restart and drive for the day as usual no issues.

Only happened when cold starting. Using my IIDTool to check codes, the PCM-Engine codes and any other codes were all related to "lost communication with transmission module" and the transfer case same thing etc.

Now I can't start it because it thinks it's in reverse. Can't pull any tranny codes, clearing codes does nothing. It's not physically stuck in reverse just thinks it is. When I parked it, was showing reverse on the dash but physically was in 6th gear.

Where to start?

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LEGACY VENDOR
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2,369 Posts
Maybe start with the electrical connector to the mechatronic unit (check that the pins aren’t corroded)?





Another possibility is a fault with the gear position/inhibitor switch.





Phil
 
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