2017 Sierra Denali LH Headlamp not Working
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Turns out it was the remote transmitter. The dealer checker it and found the (remote) transmitter was sending out a close. Ed door signal all the time. Ed -
By asilverblazer · Posted
Maybe, finding a wiring problem will either be real easy or real hard. -
By asilverblazer · Posted
Focus only on the recurring problem. Don't go looking for more. If the recurring problem is the EGR code; fix that. Ignore data that is irrelevant to diagnosing that ONE issue. It doesn't matter what the O2 sensors are reading or the timing is doing (yet) until the recurring problem is resolved. (If the diagnosis of the EGR requires O2 readings or timing advance readings then obviously use them.) FWIW: I remember watching the timing advance on my 07 Silverado, and those numbers sound similar to what I recall. -
look for it's replacement procedure on charm.li or alldata.com For my '12, the sensor is pressed into the evaporator directly, and to replace it w/o pulling the whole hvac box, you cut a hole in a specific spot to gain access to it, and then plug the hole afterwards. -
Sounds to me that its on the high speed data line. ECM, TCM, and many other modules talk on it. Wiring issue (corrosion, terminal fretting, pinched or broken wire) or a failed module or failing module (ECM, TCM, aux chassis controller).
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