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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15133
Experience:  GM Grand Master Technician 2007. 14 years experience.
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B2691 truck runs fine then after driving for a little bit it

Customer Question

b2691 truck runs fine then after driving for a little bit it shuts off I replace the fuel pump fuel pump relay ignition control number one and throttle body assembly still getting the same problem
JA: How many miles are on the car? Has the car been starting normally?
Customer: 07 ss trailblazer 6.0
JA: Are you fixing your Trailblazer yourself? What have you tried so far?
Customer: 99960 miles
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 2 months ago.
Category: Chevy
Customer: replied 2 months ago.
any word
Customer: replied 2 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer: replied 2 months ago.
what
Customer: replied 2 months ago.
any word
Expert:  Tool Hut replied 2 months ago.

Hi, My Name is ***** ***** for posting your question to just answer. I am a independent contractor for just answer. ASE Certified Master Auto Technician with 20 years experience. I am confident we can resolve your problem together.Please remember I don't know your skill level. I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies to get to a satisfactory resolution.There will probably be some equipment needed for a proper diagnosis. If you are not comfortable with this or do not have any test equipment please let me know ASAP. I also give you all of the information you may need in good faith expecting a positive rating. I am not compensated for my time until you leave a positive rating. Your rating should be based on the service you received.

The code is for a key problem. Likely either the ignition switch or a bad key.

Expert:  Tool Hut replied 2 months ago.

It could also be a Bad BCM

Customer: replied 2 months ago.
i put in a new ignition switch
Customer: replied 2 months ago.
still runs for like 30 min then stops then try to start and no start
Expert:  Tool Hut replied 2 months ago.

Do you have a scan tool? Is the code still there after ignition switch or did this code appear after replacement?

Customer: replied 2 months ago.
was there b4 and after new 1 yes have scan tool
Expert:  Tool Hut replied 2 months ago.

Ok. The ignition switch will not cause it to shut off.

Do you have any test equipment?

Scan tool with DATA?

Fuel pressure gauge

Spark tester

Injector noid light set

Customer: replied 2 months ago.
scan tool showed bcm yesterday after it stoped then ran it this morning for 30 minutes then shut off and no restart puts can talk and it shows ignition switch no BCM now
Expert:  Tool Hut replied 2 months ago.

Just so I understand. You cannot communicate with the BCM when it quits? what type of scanner do you have?

Customer: replied 2 months ago.
idont no brand but like 1000$ scan tool no the scan tool did not bring up the bcm agan just 1 time after the new ignition switch
Expert:  Tool Hut replied 2 months ago.

When i wont start do you have a security light on dash?

Customer: replied 2 months ago.
no
Expert:  Tool Hut replied 2 months ago.

So when it wont start will the starter crank the engine?

Customer: replied 2 months ago.
turns over but no start
Expert:  Tool Hut replied 2 months ago.

Do you have a spark tester? Injector noid light? Fuel pressure gauge?

Customer: replied 2 months ago.
no i dont
Expert:  Tool Hut replied 2 months ago.

Do you have RPM when the engine is cranking when it wont start?

Expert:  Tool Hut replied 2 months ago.

on the scanner

Customer: replied 2 months ago.
have not looked for that but when it run it runs perfect
Expert:  Tool Hut replied 2 months ago.

When it quits check for engine rpm on scanner when cranking.

Does the engine stall and not restart or wont start after shut off?

Customer: replied 2 months ago.
stalls out then no start
Customer: replied 2 months ago.
u think the bcm
Expert:  Tool Hut replied 2 months ago.

There is really nothing in the BCM to keep it from running. Can you let it run and have BCM data going and see if the scanner loses communication at same time it quits? What other modules lose communication?