Keeps shutting off while driving

MEGAN4221977

MEMBER
2001 CHEVROLET SUBURBAN
5.3L
V8
2WD
AUTOMATIC
182,000 MILES

While driving and it shuts off no codes, wait 10 minutes restarts and runs for 10 minutes and shuts off again. I have replaced the battery, tested the alternator (good), did a full tune up(coils, wires and plugs). Finally it threw a code, so replaced the camshaft sensor. Shut off again, no codes. Tow truck driver said sounded like fuel pump. As it tries to start. So replaced that with the pump and the pressure sensor. Ran for like 20 minutes and shut off again. Now throwing 2 codes p0342 and p0343. Low voltage bank 1 camshaft sensor, high voltage camshaft sensor bank 1. Wouldn’t these cancel each other out! Need help please!

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

Based on the description, it sounds like a faulty crankshaft position sensor. They are affected by heat when they go bad. Now, when it shuts off and you have to wait 10 minutes for it to restart, you need to check of there is spark to the plugs or using a live data scanner, see if there is an RPM signal. If there is no spark or you lose the RPM signal, the first thing I would replace is the crankshaft position sensor. Take a look through these two links. The first explains what the sensor does and the second discusses common symptoms.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

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

Now, the codes you provided are specific to the cam sensor, as you already know. Since you are getting both codes which contradict each other, I suspect you have a possible wiring issue. However, under normal conditions, it would lead to bucking, surging, and even stalling. But, what is confusing me is the idea that you need to wait 10 minutes for it to restart.

With that in mind, what is causing those codes. It could be related to a reluctor wheel that is damaged or the sensor is touching or coming in contact with the reluctor wheel. Do me a favor. First, confirm that the wiring at the cam sensor connection is in good condition. Unplug it and confirm there is no corrosion or damage to the connector. If everything appears okay, remove the sensor and see if there is any evidence of the sensor being touched or scraped. Since you have both codes, contact between the sensor and reluctor may be indicating an issue with the reluctor ring.

Let me know. Also, if you have questions, please feel free to ask.

Take care and let me know the results. Also, let me know if you have a live data scanner and if you can check for an RPM signal. A faulty cam sensor can cause ignition issues, but you will still have an RPM signal.

I will watch for your reply.

Joe