The PCM monitors the serial data (class II) circuit for communications from the Automatic Transfer Case (ATC) controller. If the ATC controller is not communicating with the PCM this DTC will set.
No serial data (class II) from ATC controller to the PCM.
This DTC will not illuminate the MIL.
• | A History DTC will clear after 40 consecutive warm up cycles with no failures of any non-emissions related diagnostic test. |
• | PCM battery voltage is interrupted. |
• | Use of a scan tool. |
This DTC will not set unless the PCM and ATC controllers have already establish communications first.. This DTC will only diagnosis an open or intermittent connection from the ATC controller to the splice.
The number(s) below refer to the step number(s) on the Diagnostic Table.