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Ron, ASE Certified Technician
Category: Chevy
Satisfied Customers: 36035
Experience:  35 years experience with ASE Certs
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On the 2005 uplander with code c0040, it is also saying

Customer Question

On the 2005 uplander with code c0040, it is also saying service ABS system. I don't have the vehicle right now it is with a friend, so I'm trying to get all possible options figured out of what it might be
Submitted: 2 years ago.
Category: Chevy
Expert:  Ron replied 2 years ago.
Hello and thank you for your question,
The code C0040 indicates you have a problem with the RF wheel speed sensor and or the connection to it. See the test steps to check it in the link below. Copy and paste the link to your browser to open and view it.