DTC Parameters

If the transfer case shift control module is not communicating with the PCM/VCM, DTC U1026 will be stored in memory. This DTC will not set unless the PCM/VCM has first established communications with the transfer case shift control module, and can only diagnose an open or intermittent connection from the transfer case shift control module to S280. DTC U1026 does not light the Malfunction Indicator Light (MIL).