GMC Troubleshooting Questions? Ask a Mechanic for Answers
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Have you had the codes read? Anytime there is a running problem it is likely that the traction off light will illuminate.
When the vehicle wont start what are the symptoms?
When it won't start does the starter crank engine? Do you know code number?
I will assume he was using a code reader then.
Do you have a security light on dash?
Have you tried cycling the key a couple of times to see if that helps it start? If not turn key on, let set for 5 sec turn key off and attempt to start
Do you have access to a scanner? When it quits going down road I need to know if it has rpm when cranking.