andyhaug

This has been discussed at length on here before, here is the relevant information from the post below. I had a 2015 that made this noise, but my 2017 does not do it. May just have to push them some more to get them to look up the "B" version of the tech bulletin. Not sure on warranty coverage of this, but there is a fix anyway. #PIP5261B: Faint High Pitched Whine Noise In Auto 4 Wheel Drive - (Feb 9, 2017) Equipped with RPO NQH or NP0 Supersession Statement: This PI was superseded to provide repair direction. Please discard PIP5261A. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern Some customers may comment on a high pitched whine noise from the vehicle noticed when driving in auto 4wd. The customer may comment that it is an intermittent noise and no noticeable pattern to when it can be heard. Recommendation/Instructions The transfer case control module on these vehicles is located next to the accelerator pedal and is not covered by any close out or hush panels. When the transfer case control module has to move the transfer case actuator motor the higher current passing through the module causes an "electronic buzz or whine" within some of the capacitors in the module that can be heard by some of our customers. The latest transfer case control module in service parts has provisions to eliminate this noise. Replace transfer case control module with current part number in the catalog. When programming the module ensure that the description for the calibration installed states the following "New software (Version 9.2) to address field issue of setting DTC C0398 while being driven in AUTO mode for 1 hour due to the IPS sensor drifting."

This is the trim around the window on the door. Around the outside it is not really held in, the window weather stripping is what really holds it. I just peeled it back enough to put some rope caulking in there and it cannot rate against the door anymore.

I had this issue on my '17. On the door there is plastic trim that goes up around the window. In previous generations this would have been left body color metal. There is a gasket on the cab that seals against this plastic trim piece. Since it is not held in well, it rattles against the metal of the door. I pealed my back and put some rope gasket behind it to fix the rattle.

The 6 speed does an air purge on the first 2-3 shift which causes a slip and sometimes a flare. If you only see this on the first 2-3 shift it is normal.

I have a 2017 LT, no LED reverse lights, and yes I have seen this as well. It is not every time, but occasionally it does this.

Where are you on the height adjustment? I found that if the seat is all the way down it will rock front to back. If you lift it up a bit the rock goes away.

I have a 5.3 with the 6 speed. Mine does this as well. It is the 5th to 4th downshift. It is most noticeable on mine if I simply let off and let it coast. When I get to 30mph it will downshift and I lose 5 mph very quickly.

Little over 15000 on the truck, about 9000 on transmission #2. Transmission #1 would flare 500 RPM between 2 and 3 if I followed a particular sequence. Transmission #2 will do this sometimes, but is not repeatable enough for them to do anything.

They keep telling me that it is not broken. If it is not broken then there is nothing to come up with a fix for. Guess it is supposed to slam, stutter, flare and act generally confused. Has anyone received any help from GM that actually fixed the way this transmission shifts?

Here are a couple of possibilities. Not sure how I feel about the second one, seems like dirt going through the engine would be bad for everything. Premature Catalytic Converter Failure October 22, 2014 If the catalytic converter has failed or DTC P0420 (Catalyst System Low Efficiency) or P0430 (Catalyst System Low Efficiency Bank 2) is set on some 2015 and prior GM cars and gasoline-powered mid-size trucks, light-duty trucks and heavy-duty trucks, inspect for a poor crimp at circuit terminal on the engine bank with the condition. Inspect the ground for possible corrosion or damage at the ground terminal ring, fasteners and grounding surfaces. (Fig. 12, 13) If no corrosion or damage is found, tighten the ground bolt to the proper torque specification. (Fig. 14) Fig 12 Fig 13 Fig 14 – Thanks to Richard Renshaw No Comments » Air Filter Box Seal Leak April 25, 2016 On some 2014-2016 Corvette, Silverado, Sierra; 2015-2016 Escalade models, Yukon models; and 2016 CTS and Camaro equipped with a V8 engine (RPOs LT1, LT4, L83, L86, LV1, LV3), the MIL may be illuminated and DTCs P0420 (Catalyst System Low Efficiency) and P0430 (Catalyst System Low Efficiency Bank 2) may be set. These conditions may be caused by excessive dirt/debris entering the air filter box and bypassing the seal of the air filter, causing damage to the H02 sensor element (Fig. 15) and blocking the catalytic converter. (Fig. 16) Fig. 15 Fig. 16 Do not replace any parts for these conditions until the air filter housing has been validated to be completely sealed. Inspect the air housing cover for any missing tabs or fasteners. Also remove the air filter housing cover and inspect the seal around the filter as well as the air filter sealing surface for signs of not contacting the air filter seal. (Fig. 17) Fig. 17 In addition, look for dirt/debris in the air filter housing cover bypassing the air filter. (Fig. 18) If dirt/debris is bypassing the air filter due to a faulty seal, replace the air filter. If the air filter housing is not properly sealing, refer to the appropriate Service Information for additional diagnostic procedures. Fig. 18

I found that mine will only rock front to back if the seat is all the way down. If I raise it up a little, no more rocking.

This is the price we pay for lazy/cheap engineering. There are capacitors designed specifically to fix this problem, but since they are a few cents more GM will not use them. They lift the capacitors off of the circuit board slightly so the noise is not generated.

Mine just did this again. The radio was updated about 2 months ago. The buzzing happens when the backlight of the touch screen comes on. I do not understand the circumstances that cause it to happen so randomly though. Anyone get an actual fix to this?

I believe it only affects the power seat option. Mine is power, not sure if it is 8 or 10-way though.

I don't own one, I have a 2015, but I have looked at several 2016s. All of them that I have looked at show signs of rust on the ends of the rear crossmembers that are exposed in the rear wheel wells. One 2016 that the dealer had used as a loaner during the winter showed rust on every weld visible in the rear wheel wells. Someone posted on here somewhere that the TSB for frame rust was updated to include the 2016 model.