Turns over but won't will not run?

2005 CHEVROLET TAHOE

243,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC

CRYSTAL FISH GABALDON

MEMBER
1 POST

Turns over but won't crank. Fuel gauge temp gauge oil pressure gauge and battery gauge aren't working. The radio lock/unlock switch and windows also stopped working. This all happened at once. I seen that you were having the same problem. Did you ever figure out what to do?

Jul 2, 2019 at 10:38 AM

KASEKENNY

✓Experienced Mechanic
18,907 POSTS

Hi Crystal,

I just want to make sure I understand the issue, the engine cranks but will not start and all your gauges will not operate?

if so, your gauges are all communication network inputs from the PCM. I would suggest we start with chasing the no start issue because that may fix the gauge issue as well. The way they work is the sensor sends a signal to the PCM and then the PCM sends a signal to the cluster to display what the sensor is telling it.

Let's start with testing for spark and fuel. Measure fuel pressure at the rail while cranking and then just pull a spark plug and hold it against the block and see if you have spark.

Depending on the results we can pick path to go do. Also, check to see if you have any codes. This will short cut a lot of the testing if you do. Let me know and we can go from there. Thanks

Jul 7, 2019 at 11:12 AM

STRAILER

✓Experienced Mechanic
55,561 POSTS

This sounds like the BCM is out. I would start with a scan. here is a video that shows what needs to be done. Have you checked fuses? Here is a guide and the fuse locations as well:

https://youtu.be/InIlnsjOVFA

and

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Please let us know what happens.

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