SUV will shut off at any speed

Tiny
TAHOE00001
  • MEMBER
  • 2001 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 230,000 MILES
SUV will shut off while driving. Shut it off for few minutes and will start back up then will shut back down. Changed the crankshaft position sensor and it still will not start. Put old crankshaft position sensor in and it starts right up.
Tuesday, October 22nd, 2019 AT 2:37 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome to 2CarPros.

I feel you are on the right track with the sensor. Although a new sensor did worse, it may be bad. Here is what I need you to check.

You will need a live data scanner to do this. When the engine stalls and will not start, using the scanner, see if there is an RPM signal. If there is no signal, try a different sensor.

If you have no access to a scanner, when it won't start, you will need to check for spark to the plugs. Here is a link that explains how that is done:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Here is a link that explains common symptoms related to a failing crankshaft position sensor. See if it seems to mirror what you are experiencing.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Also, when it is running, does the check engine light stay on? If so, have you scanned for diagnostic trouble codes?

Let me know.

Joe
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Tuesday, October 22nd, 2019 AT 7:13 PM

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