A Chevrolet diagnostic fee costs $120 to $200 in 2026
Chevy dealers charge about one hour of labor to trace a fault, which puts most owners between $120 and $200. Trucks and Duramax diesels run higher. Covered faults under the 3-year bumper-to-bumper warranty are diagnosed free.
What you get for the fee
| Typical fee | $120 to $200 at Chevrolet dealers in 2026. KBB's check engine light estimate for a Chevy Trax in California was $209 to $283 including the first hour. |
|---|---|
| Silverado and Duramax | Diesel and heavy-duty truck diagnosis is specialist work; expect $200 or more. |
| Under warranty | Covered faults are diagnosed free. |
| Credited if you repair? | Sometimes. Ask the service advisor. |
| Independent alternative | $50 to $150 at an independent shop. GM vehicles are common and well supported by aftermarket scan tools. |
Why the fee exists
GM dealers use the factory GDS2 tool, which matters for module programming and some transmission faults. For most check engine lights an independent finds the same answer for less.
What will my diagnostic cost?
Pick the kind of shop, your state's cost level and how tricky the problem is. The estimate updates as you change them.
Estimates from published 2026 shop rates. Ask the shop for its exact fee before you book.
Common questions
How much does a Chevy dealer charge for a diagnostic?
$120 to $200 in 2026, more for diesels.
Is a Chevrolet diagnostic free under warranty?
For a covered fault, yes.
Should I use a dealer or an independent for a Silverado?
Independent for common faults, dealer for programming, recalls and Duramax issues.