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.
Pinpoint Test U: SASM HS-Can Bus Off Concern: Notes
Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information.
Normal Operation and Fault Conditions
With the ignition ON, the SASM communicates with the other modules over the HS-CAN2 and through the GWM. A GWM failure, a circuit failure on the CAN or an excessive load on the network can all cause a communication error and the SASM to set a DTC.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| SASM U0001:88 | High Speed CAN Communication Bus: Bus Off | The module could not communicate on the network at a point in time. The fault is not currently present since the module is able to communicate with the diagnostic scan tool to report this DTC. |
Possible Sources
- Network communication concern
- GWM
Visual Inspection and Pre-checks
- VERIFY the integrity of the connectors and wiring. Refer to MODULE COMMUNICATIONS NETWORK , for schematic and connector information.
NO RELATED
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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.