DTC U1192 Loss of VTD (Passlock)/EVO Communication. GMC Truck Savana 1998

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1998 🢒 Savana 🢒 DTC 🢒 DTC U1192 Loss of VTD (Passlock)/EVO Communication

Engine Controls Components
Cell 22: PWR, GND and DLC
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The PCM monitors the serial data (class II) circuit for communications from the Passlock/EVO controller. If no message is being sent form thePasslock/EVO controller this DTC will set.

Conditions for Setting the DTC

No communications on serial data (class II) circuit from Passlock/EVO controller.

Action Taken When the DTC Sets

This DTC will not illuminate the MIL.

Conditions for Clearing the MIL/DTC

•	A History DTC will clear after 40 consecutive warm-up if no failures are reported by this or any other emissions related diagnostic.

•	PCM battery voltage is interrupted.

•	Use of a scan tool.

Diagnostic Aids

This DTC will only diagnosis an open or intermittent connection from the Passlock/EVO controller to the splice.

Test Description

The number(s) below refer to the step number(s) on the Diagnostic Table.

In this step, the scan tool is checking for communication between the PCM and the Passlock/EVO controller.

This step checks the serial data circuit from the Passlock/EVO to the splice for an open or proper connection.

Step

Action

Value(s)

Yes

Important:: Before clearing DTCs, use the Scan Tool Capture Info to record Freeze Frame and Failure Records for reference, as data will be lost when Clear Info function is used.

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Connect the scan tool.
Turn the ignition ON.
Using the scan tool, select Diagnostic Circuit Check and then Class 2 Message Monitor.

Does the scan tool display Passlock/EVO controller Active?

Go to Step 3

Go to Step 4

The DTC is intermittent. If no additional DTCs are stored, refer to diagnostic aids. If any additional DTCs were stored, refer to the applicable DTC table(s) first.

Are any additional DTCs stored?

Go to the Applicable DTC Table

Check the Serial Data (Class II) circuit from the Passlock/EVO controller to the splice for the following conditions and repair if necessary:

•	Open circuit.

•	Proper connection at the Passlock/EVO controller.

Was a repair performed?

Go to Step 5

Go to Passlock/EVO Controller Diagnosis

Use the scan tool in order to select DTC, Clear Info.
Start the engine.
Allow the engine to idle at normal operating temperature.
Select DTC, Specific, then enter the DTC number which was set.
Operate the vehicle until the scan tool indicates that the diagnostic ran (refer to Conditions for Setting the DTC).

Does the scan tool indicate that this diagnostic passed?

Go to Step 6

Go to Step 2

Using the Scan Tool, select Capture Info, Review Info.

Are any DTCs displayed that have not been diagnosed?

Go to the Applicable DTC Table

System OK