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K. Wiggins
K. Wiggins, Chevy Technician
Category: Chevy
Satisfied Customers: 2789
Experience:  ASE Certified Technician AA in automotive Technology, 15+ years in the trade
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Chevrolet K1500 4x4: Getting a trouble code of 42 and 45, looking

Customer Question

Getting a trouble code of 42 and 45, looking for wisdom on best place to start
Submitted: 1 year ago.
Category: Chevy
Expert:  K. Wiggins replied 1 year ago.
Hell, code 42 is the electronic spark timing system (EST) error and 45 is running rich. Both will cause the problems you have. Is the computer in your truck under the hood on the coolant reservoir or in the passenger compartment? The test differ for each one.
Customer: replied 1 year ago.
I'm going to say in the passenger compartment, there is nothing on the coolant reservoir located on the passenger side. ICM need to be replaced?
Expert:  K. Wiggins replied 1 year ago.
More than likely it's the ICM or EST module, they failed pretty commonly with age. Run through the test real quick and let me know what you find.
Expert:  K. Wiggins replied 1 year ago.
and for code 45
Expert:  K. Wiggins replied 1 year ago.
Hello, I was just wanting to follow up and see how things went.