2017 Ram 1500 U0109 Diagnostic Code: Check Engine Light Persistent After Module Replacement
My 2017 Ram 1500 is experiencing a recurring check engine light, displaying the U0109 diagnostic code. The dealership has already replaced both the fuel pump control module and the powertrain control module, but the issue persists. I'm seeking advice on how to resolve this ongoing problem. The U0109 code typically indicates issues with the CAN bus system, such as: - Open circuit in the CAN bus + line - Open circuit in the CAN bus - line - Short to power in either CAN bus circuit - Short to ground in either CAN bus circuit - Rarely, a faulty control module I'm concerned about whether this is a known issue with 2017 Ram 1500 models and if further diagnostics or alternative repair shops might be necessary.
This seems like a warranty-related issue. It's frustrating to keep returning to the dealership, but it may improve with future visits. If possible, request a technician with Can bus expertise—this is often the key to diagnosing U0109 issues. Common causes of U0109 include open or shorted CAN bus circuits. A faulty control module is rare but should be ruled out. For more details: https://example.com/u0109-can-bus-issues