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2008 GM Canyon, 4cyl. At times when I try to start, it

Customer Question
2008 GM Canyon, 4cyl. ...

2008 GM Canyon, 4cyl.

Mechanic's Assistant: Are you fixing your Canyon yourself? What have you tried so far?

At times when I try to start, it won't. There's power, but nothing happens. I've replaced battery and starter solinoid, but it's still a periodic problem. Sometimes a jump start seems to be the only fix.

Mechanic's Assistant: Have you checked the battery, particularly the terminal connections? Are they corroded?

No

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

As I said, I've replaced the battery and terminals are fine.

Submitted: 23 days ago.Category: GM
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Answered in 5 minutes by:
3/31/2018
GM Mechanic: Jerry Newton, GMC Technician replied 23 days ago
Jerry Newton
Jerry Newton, GMC Technician
Category: GM
Satisfied Customers: 5,628
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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When it fails to start is the time to diagnose it. I would begin right at the starter: when it doesn't crank, is there power to the purple wire at the starter solenoid, or no?

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Customer reply replied 23 days ago
I don't know. Had to jump start it to get running this morning.
GM Mechanic: Jerry Newton, GMC Technician replied 23 days ago

Is there power to the truck when this happens? That's where we started off, you said there's power but nothing happens.

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Customer reply replied 23 days ago
there is power. Radio comes on, dash lights come on. But when you turn the key, nothing happens.
GM Mechanic: Jerry Newton, GMC Technician replied 23 days ago

Do you have any diagnostic tools, like a multimeter, test light, scan tool, etc?

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Customer reply replied 23 days ago
I have a scan tool.
GM Mechanic: Jerry Newton, GMC Technician replied 23 days ago

OK. Does it read live data? What I'm driving at here is the system voltage, when it won't start, before you jump start it, what is the system voltage in the truck? A scan tool will tell you, as long as it reads live data, or you can just put a multimeter on the battery terminals.

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Customer reply replied 23 days ago
Not sure if it'll read live data. Will try next time it happens.
GM Mechanic: Jerry Newton, GMC Technician replied 23 days ago

OK. That is the key, you have to diagnose this when it's malfunctioning, any testing you do right now while it works will be inconclusive.

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