Possible Causes - Scan Tool Does Not Communicate With Can C (Hub Bus Style)
WARNING: This page is about a different car, the 2016 RAM 3500 HD and 2016 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic will not have Diagnostic Trouble Codes (DTCs) to assist in determining no scan tool communication with the vehicle.
Default Actions:
- Vehicle may start and run.
- The Wipers and Headlamps may be automatically activated during an ignition cycle when communication is in default mode.
| Possible Causes |
|---|
| INOPERATIVE SCAN TOOL |
| DATA LINK CONNECTOR (DLC) |
| DATA LINK CONNECTOR FUSED B (+) CIRCUIT OPEN OR HIGH RESISTANCE |
| DATA LINK CONNECTOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE |
| CAN C (+) BUS CIRCUIT OPEN, SHORTED OR HIGH RESISTANCE |
| CAN C (-) BUS CIRCUIT OPEN, SHORTED OR HIGH RESISTANCE |
| POOR TERMINAL CONTACT OR CONNECTOR CONNECTION(S) |
| STAR CONNECTOR |
| ANY MODULE ON THE CAN C BUS |
NORMAL CAN C BUS CIRCUIT VOLTAGE TABLE
| CIRCUIT | NORMAL VOLTAGE VALUES |
|---|---|
| CAN C BUS (-) | 1.5 - 2.5 volts |
| CAN C BUS (+) | 2.5 - 3.5 volts |
| Difference Between CAN C BUS (+) and CAN C BUS (-) | 0.5 volt |