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  1. K

    Need help with P0299

    I'm having similar issues, threw the P0299 this morning along with the P003A and went into reduce engine power. Taking it to a shop this afternoon, its probably the vane sensor but will let you know what they say. I've done some research and this seems like a good thread, may have what you are...
  2. K

    Allison limp mode when cold start

    I'm having similar issues, it appears to only happen on the first cold start; after the codes are cleared the truck runs fine. Battery connections are good, brand new batteries, fluid is good..I've been searching for anything that could be the source but still nothing. Has anyone had any luck or...
  3. K

    Multiple Transmission Codes

    I replaced the batteries. The batteries are brand new,i replaced them last night around 6pm central time and started it this morning around 7am central time.
  4. K

    Multiple Transmission Codes

    thanks for the reply! I reset the codes and it through them again. I have replaced the batteries. It appears to only throw the codes on the first cold start. This morning it appeared to have locked up, the codes were thrown and the truck would not shift into drive or reverse, nor would the...
  5. K

    Multiple Transmission Codes

    I warmed up the pickup this morning only to find it in limp mode. I drive a 2007 LMM Duramax/Allison 6 speed extended cab/long bed (new body style). I haven't had any recent problems with it. The codes I pulled were: PO751 (shift solenoid A) PO756 (shift solenoid B) PO761 (shift solenoid C)...
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