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.
Diagnostic Test
- ATTEMPT TO DUPLICATE THE CONDITION NOTE:
This DTC sets when the CAN IHS Bus is disabled. If the scan tool is able to read this DTC, then the fault is currently NOT active. This diagnostic procedure only troubleshoots an intermittent condition. Follow this procedure to attempt to locate the intermittent condition or induce the fault so the diagnostic procedures under SCAN TOOL DOES NOT COMMUNICATE WITH CAN IHS in the dignostic informaiton can be followed.
- With the scan tool, run a Vehicle Scan Report and attached it to the repair order.
- With the scan tool, erase DTCs.
- Using the Vehicle Scan Report, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
Is the fault now present?
NOTE:If the fault is present, the scan tool will not communicate with modules on the CAN IHS Bus.
Yes
- Proceed to SCAN TOOL DOES NOT COMMUNICATE WITH CAN IHS. Refer to DIAGNOSIS AND TESTING .
No
- Go To 2
- ATTEMPT TO LOCATE AN INTERMITTENT CIRCUIT FAULT NOTE:
The scan tool LOSS OF COMM TEST will force the modules on the CAN IHS Bus to continuously ping each other.
- With the scan tool, initiate the LOSS OF COMM TEST.NOTE:
A value above 0 under the NUMBER OF NO RESPONSES can help indicate the location of a circuit fault while wiggling the related CAN IHS Bus circuits.
- With the scan tool, initiate the LOSS OF COMM TEST.
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.