Drivers notice the problem almost immediately after the fault appears. The first indication is usually a loss of power‑door‑lock operation or interior illumination. The dashboard may display a “BCM” or “Body Control” warning, and other convenience features—such as the power‑window auto‑up/down, courtesy lights, or the remote‑key entry—stop responding. Because the D‑ side of the CAN bus carries data for multiple body‑control modules, the fault can cascade, leaving the vehicle unable to lock or unlock doors, flash hazard lights, or activate the interior dome light. In many cases the vehicle will still start and drive, but the loss of these safety‑related functions is a clear sign that the communication bus is compromised.
The D‑ side of the CAN network is a twisted‑pair that runs through the vehicle’s harness. Exposure to moisture, abrasion from moving components, or poor crimp quality can break the circuit. When continuity is lost, any module that relies on that bus—typically the Body Control Module (BCM) and sometimes the Transmission Control Module (TCM)—cannot exchange data, triggering U0060.
A control module that contains a damaged CAN transceiver or internal circuit board failure will present an open circuit to the bus. The module may still power up, but it will not transmit or receive messages, causing the bus to appear “open” to the scan tool. Common culprits are the BCM, TCM, or integrated front‑instrument cluster module, all of which are tightly coupled to the D‑ bus.
If a module’s firmware is corrupted—perhaps after an incomplete re‑programming session—the CAN controller can lock up, effectively opening the bus. The module will report a fault even though the physical wiring is intact. This scenario is less common than hardware failures but can occur after a failed flash or after using non‑OEM calibration tools.
Connect a professional OBD‑II scan tool capable of reading manufacturer‑specific modules. Verify that U0060 is present and note any additional codes (e.g., U0100 “Lost Communication” on other buses) that may indicate a broader network issue.
Locate the D‑ bus connector—usually near the BCM or under the dash. Check for frayed wires, corrosion, or loose pins. Clean any oxidized contacts with a contact‑cleaner spray and reseat the connector.
Using a multimeter, measure resistance between the two pins that form the D‑ bus pair at both ends of the harness. A reading of 0 Ω ± 0.5 Ω indicates good continuity; an infinite reading confirms an open circuit.
With the scan tool, command a “Read Data Stream” from the suspected module (BCM, TCM, etc.). If the tool cannot receive any data, the module is likely the source of the open bus.
If wiring is sound and the module responds intermittently, re‑flash the module using the manufacturer’s official software. Ensure the battery is above 12.5 V and that the re‑programming session is not interrupted.
– Repair: If the continuity test shows a broken wire or corroded connector, repair the harness by splicing with proper automotive‑grade wire and heat‑shrink tubing, then re‑verify continuity.
– Replace: When the module’s CAN transceiver is defective or firmware corruption persists after a clean flash, replace the module. Replacement units vary by production date and software version, so the correct module is matched by VIN before programming.
Clear all codes, disconnect the battery for at least 30 seconds to reset the network, then reconnect and run a full system scan. Confirm that U0060 no longer appears and that all affected functions (lights, locks, windows) operate correctly.
If the continuity test isolates a healthy harness but the module fails the communication test, the internal CAN controller is likely damaged. Repeated repair attempts on a module with a compromised transceiver seldom provide a lasting fix. In such cases, replacing the module eliminates the open‑circuit condition and restores reliable bus operation.
Modern control modules are complex and integrated with security and immobilizer systems. Choosing a replacement isn’t only about the hardware—it’s about correct programming and compatibility. Flagship One specializes in VIN‑matched control modules, providing a plug‑and‑drive solution backed by warranty. Their units arrive pre‑programmed to your vehicle’s specifications, eliminating dealer‑only re‑flash delays and ensuring seamless integration with the existing network.
Service Recommendation: Most issues related to this fault are diagnosed and corrected through inspection, wiring repair, and calibration rather than module replacement. For modules not typically replaced through aftermarket suppliers, diagnosis and repair should be performed by a certified automotive technician with access to factory service information and tooling.