If you have a voltmeter, with the car running check the voltage across the battery posts. It should be around 13.8. If it’s 12 volts or less, even tho your alternator tests out good, it’s not charging the battery and the car will run off the battery until it drains the battery. I’d check the wires coming from your alternator to make sure they have a good connection and not broken and I’d check your fuse box for a blown fuse as well assuming you don’t have a radio or amplifier or something else wires up that stays on all the time. Some alternators are 1 wire and it usually has a wire going directly to the positive battery cable. Also could have a bad fusible link
Do you know how to read a wiring diagram an use a DVOM - digital volt ohmmeter to test battery power an ground to the instrument cluster ? Do you have a professional scan tool to check for DTC'S - diagnostic trouble codes in all modules on the vehicle ? If not , your best bet mite be to have a qualified repair shop check it out .
There is a very nice Youtube video that covers this exact repair put out by the channel South Main Auto. The video I believe was put out approximately in the last month. It also covers the faulty backup camera which apparently fails due to corrosion and age.
You first want to look to see the status of the code. Is the code current, pending, or permanent? If pending, you will want to clear the code and see if it comes back, same thing with current. If the code is permanent then you would want to start by visually inspecting the wiring harness at the transfer case and the transfer case control module. If there are no visual defects found then you will need to complete a diagnostic procedure to determine if it is the module or the wiring. I would be happy to walk you through this process. Please feel free to contact me at:
You take it to a qualified repair shop , unless you know about GMLAN serial data networks . U codes are network communication codes , problem with a module not talking or the data bus has a problem . GMLAN is general motors version of C.A.N. - controller area network . Watch this video . https://www.youtube.com/watch?v=FqLDpHsxvf8
Invalid Data Received From Body Control Module
Body Control System Description and Operation
Report a problem with this article
The body control system consists of the body control module (BCM), communications, and various input and outputs. Some inputs, outputs and messages require other modules to interact with the BCM. The BCM also has discrete input and output terminals to control the vehicle's body functions. The BCM is wired to the high speed GMLAN serial data bus, low speed GMLAN serial data bus and Multiple LIN buses and acts as a gateway between them.
Power Mode Master
This vehicle body control module (BCM) functions as the power mode master (PMM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determining the power mode that will be sent over the serial data circuits to the other modules that need this information; the PMM will activate relays and other direct outputs of the PMM as needed. Refer toPower Mode Description and Operation for a complete description of power mode functions.
The body control module (BCM) in this vehicle functions as a gateway or translator. The purpose of the gateway is to translate serial data messages between the GMLAN high speed bus and the GMLAN low speed bus for communication between the various modules. The gateway will interact with each network according to that network's transmission protocol.
All communication between the BCM and a scan tool is on the high speed GMLAN serial data circuits. A lost communication DTC typically is set in modules other than the module with a communication failure.
The various body control module (BCM) input and output circuits are illustrated in the corresponding functional areas on the BCM electrical schematics. Refer to the Body Control System Schematics for more detailed information.
Check the fuel pressure regulator I hunch it's leaking, Do this, remove the vacuum line from the regulator if there's gas in the line replace the regulator if it looks good leave the line off and start the engine for a minute or Two if you see any gas coming out again replace the regulator. I hope this helps. Take care. If you have more questions for me use testimonial and it will show up in my email.
Try instrument panel fuse 17, AuxiliaryPower Rear. ...The instrument panel fuse block is located on the passenger side panel of the center console. To access the fuses, open the fuse panel door from the passenger side by pulling it out.