Transmission problem - electrical problem. 2011 silverado...

Q: Transmission problem - electrical problem. 2011 silverado 5.3l

asked by on April 13, 2017

One minute my truck is fine, the next the transmission isnt shifting right. If i give it gas it acts if its in nuetral. Manual mode is the same. The codes it is throwing goes ad follows

U0100 (×2) U0109 P0606

Stumped.....

My car has 135000 miles.
My car has an automatic transmission.

Those are pretty serious codes referring to communications failures between control modules as well as potential failure of the PCM itself. Most electrical failures are wiring related (corrosion, bad grounds, wire break, etc.) and diagnosing this will proceed with those presumptions in mind. Once every possible wiring or interconnection fault is ruled out, at that point you think about reflashing the PCM and/or other controllers referred to in the codes. If that doesn’t work, you sub out for a known good PCM. The problem is traceable but you are looking at pages of steps to go through and you will have to have, in hand, a copy of the Factory Service Manual plus any applicable Technical Service Bulletins published by GM on this issue. There is no other way to do the diagnostic because the schematic you go through is a huge decision tree. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a check engine light diagnostic - CAN bus failure and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

I have a 1997 Chevy pickup truck with a vortex motor in it will not fire up unless I started up and starting fluid but runs great

You should have the fuel pressure tested to see if it is 60 to 66 psi. If it is low it will be hard to or no start and is due to the fuel pump not producing enough pressure and...

High-pitched noise

High pitch brake noises are usually caused by the wear indicator on the brake pads. This is a thin piece of metal that makes contact with the rotor with the brake pad lining gets to about 20%. The noise is...

Squeaking sound when backing up

The left rear bulb would need to be checked to see if it is bad. It's possible that there could have also been a blown fuse or a short that has occurred. A technician will be able to inspect your...

Related articles

The Best Used Cars to Buy If You Love Road Trips
If If you love to travel, comfort is very important in a vehicle. You want a nice, quiet ride, comfortable seating, and enough room. We have evaluated several used vehicles, and narrowed our favorite road trip vehicles down to the...
Industry News for Automotive Techs: October 8-14
50 MPG Chevrolet Cruz Diesel, Mazda's G-Vectoring drive system, Uber and Volvo collaborate on autonomous cars, and Hubb's new reusable oil filter.
2012 Chevrolet Cruze vs. 2012 Hyundai Elantra: Which One Should I Buy?
When you’re looking for a four-door sedan, you’re likely interested in a smaller family car that still offers decent styling and looks, great gas mileage, and a comfortable interior that will keep your family safe as you’re driving. While not...