Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Traction Battery Control Module (TBCM)
The TBCM is internal to the high voltage traction battery (HVTB) and is hardwired to the HVTB contactors. The PCM controls the contactors by sending a CAN message to the TBCM.
The TBCM is on the high speed CAN. If 1 of the 2 bus wires becomes shorted to ground or voltage, communications on the CAN may not be possible. If there is an open in the network, communications may continue between some modules depending upon the location of the open circuit. Check the high speed CAN circuits 1908 (WH) and 1909 (BK), between the TBCM C4227a and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the TBCM C4227a, or a problem in the in-line connector. Since both the PCM and TBCM share network termination responsibilities, a problem in either of these modules can result in a high speed CAN failure. For removal and installation information, refer to HIGH VOLTAGE TRACTION BATTERY .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.