Car stalls then crank no start?

Tiny
TOOMANYCARPROBLEMS
  • MEMBER
  • 2006 GMC ENVOY
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 146,000 MILES
I am having a few problems with the vehicle listed above, but the main ones are stalling and cranking but not starting. They are both intermittent when they happen, but also becoming a consistent daily occurrence. If I drive the car for a little while, turn it off and try to turn it back on, it will crank but not start. If I stall/ lose power while driving, it will also do a crank no start when I try to start it. When it is hot outside, I get not even an hour of drive time before it stalls/lose power. On cold days I have 1-1.5 hrs. I say stall/ lose power because the vehicle just shuts off. Light and radio on but no power steering brakes and engine. When I scan for codes, I always get O2 sensor codes but when I stall I get a few extra ones. The ones I usually get are P0036, P0054, P0136, P0141. Randomly I get P0443 and after I stall I also get it. After my car stalls/loses power I get P1516, P1682, P2101. My pending codes are P0054, P0136. My stored codes are P0036, P0141, P0443, P1516, P1682, P2101. I replaced the downstream 02 sensor bank 1 sensor 2 and the codes never went away. My fuel pressure is fine but there is no spark. Also, if I turn on my a/c my car stalls in less than 5 minutes. My fuse was brown for the blower motor, so I replaced it. The same problem still exists. I used starting fluid to check for vacuum leaks but didn't see any. Things I have noticed, my feet would get extremely hot, the engine would run rough and my power steering is rough before it stalls/loses power. When looking at live data for the 02 sensors, sensor 2 doesn't fluctuate, it barely changes, mostly staging the same. Using a multimeter after 5 mins of run time the downstream 02 sensor listed in the codes is.5 and doesn't change and the other downstream O2 sensor not in the codes is.2-.7.
Wednesday, May 10th, 2023 AT 12:32 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
It sounds like the crankshaft angle sensor is going out which will sometimes not leave a code. here is what is said about the codes you do have. Also, I would service the throttle bore.

P0036: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
P0141: Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
P0443: Evaporative Emission Control System Purge Control Valve Circuit Malfunction
P1516: Throttle Actuator Control Module Throttle Actuator Position Performance
P1682: Ignition 1 Switch Circuit 2
P2101: Throttle Actuator Control Motor Circuit Range/Performance

Here is a guide to help you clean the throttle bore and the location of the crankshaft angle sensor so you can check the connector and swap out the sensor if needed. I would replace the ignition switch next.

https://www.2carpros.com/articles/throttle-actuator-service

Check out the images (below). Please let us know what happens. Please start a new question for the oxygen sensor problems.
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Wednesday, May 10th, 2023 AT 6:08 PM

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