What does a code 85(Prom-Error?faulty circuit) mean?

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! A code 85 on your 1992 Chevrolet K3500, indicating a "PROM Error" or "Faulty Circuit," is like your truck's way of saying it's having a bit of an identity crisis. The PROM (Programmable Read-Only Memory) chip in your vehicle's engine control module (ECM) stores crucial data for engine management. If there's an error, it could mean the ECM isn't reading the data correctly, which might be why your truck won't start. This could be due to a faulty PROM chip, a bad connection, or even a failing ECM. It's like trying to read a book with missing pages—you're not going to get very far. I'd recommend having a professional check the ECM and its connections to ensure everything's in working order. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.