U0019–CAN B BUS

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the Instrument Cluster awake.
Set Condition:
Whenever the Can B Bus (+) or B Bus (–) circuit is open, shorted to voltage or shorted to ground, this code will set.

Possible Causes

CAN B BUS DTCs IN FRONT CONTROL MODULE

(D54) CAN B BUS (–) CIRCUIT OPEN

(D55) CAN B BUS (+) CIRCUIT OPEN

INSTRUMENT CLUSTER

1.CHECK FOR AN ACTIVE DTC

Is the DTC active?

Yes

The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
Perform BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

2.CHECK FRONT CONTROL MODULE DTCs

Does the scan tool display the U0019–CAN B BUS DTC?

Yes

Refer to the symptom list for problems related to Communication in the ELECTRICAL– ELECTRONIC CONTROL MODULES – ELECTRICAL DIAGNOSES section. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)

3.(D55) CAN B BUS (+) CIRCUIT OPEN

Is the resistance below 2.0 ohms?

Yes

Repair the Can B Bus (+) circuit for an open.
Perform BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

4.(D54) CAN B BUS (–) CIRCUIT OPEN

Is the resistance below 2.0 ohms?

Yes

Replace the Instrument Cluster in accordance with the Service Information.
Perform BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Repair the Can B Bus (–) circuit for an open.
Perform BODY VERIFICATION TEST VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)