DTC B2960 Sec Sys Sensor Data Incorrect but Valid. GMC Truck GMC K Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Body and Accessories 🢒 Theft Deterrent 🢒 DTC B2960 Sec Sys Sensor Data Incorrect but Valid

Theft Deterrent System Components
Theft Deterrent System Schematics Vehicle Theft Deterrent
Variable Effort Steering
Theft Deterrent System Schematic Icons
Theft Deterrent System Schematic Icons

Circuit Description

The EVO/Passlock module will read an analog voltage from the Passlock sensor. Based on an internal reference, the EVO/Passlock module will determine if the measured voltage is open, shorted to ground, a valid code, or a tamper code. There are 10 possible valid code combinations. The EVO/Passlock module will only accept the last learned valid code.

Conditions for Setting the DTC

•	The EVO/Passlock module will inspect for a valid code when the ignition is rotated from ON to crank.

•	The EVO/Passlock module is reading a different code value than previously learned from the Passlock sensor.

Action Taken When the DTC Sets

•	The vehicle will not run if the fault occurs before the vehicle is started. The security telltale will be flashing.

•	If the vehicle is running when the fault occurs, the EVO/Passlock module will be in the fail enabled mode allowing the vehicle to start and run. The security telltale will be ON.

Conditions for Clearing the DTC

•	The DTC will clear after an ignition cycle has occurred without the fault.

•	EVO/Passlock module history codes will be cleared after 100 ignition cycles with no current codes active.

•	Using a scan tool

Diagnostic Aids

•	When replacing the Passlock sensor, all the sensor components; the lock, the sensor, the filter, and the harness, are included as a replacement part and must be replaced.

•	Use the scan tool in order to test the Passlock data voltage and the Passlock code.

•	Perform a visual inspection of the wiring and the connectors.

•	Inspect the Passlock sensor harness and the filter for an intermittent or poor connections (including the in-line connector). Refer to Intermittents and Poor Connections .

Test Description

The numbers below refer to the numbers on the diagnostic table.

If the Passlock sensor has been replaced without the Passlock Learning Procedure, DTC B2960 will set.

This step will determine if the problem is in the Passlock sensor or the EVO/Passlock module. A 5 volt signal is normal for the Passlock signal input with the Passlock sensor disconnected.

Step

Action

Value(s)

Yes

Did you perform the VTD Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

Has the Passlock sensor just been replaced?

Go to Step 6

Go to Step 3

Turn the ignition switch ON.
Disconnect the connector C266 at the base of the steering column.
Connect a fused jumper between the EVO/Passlock module connector terminal B8 and terminal B3.
Use a scan tool in order to read the Passlock data voltage.

Is the scan tool voltage reading within the specified range?

4.9-5.0 volts

Go to Step 5

Go to Step 4

Remove the jumper.
Replace the EVO/Passlock module. Refer to Theft Deterrent Module Replacement .

Is the repair complete?

Go to Step 6

Remove the jumper and Replace the Passlock sensor in the electronic column lock module assembly.

•	With Tilt Wheel and Column Shift

-	To disassemble the lock module assembly, refer to Electronic Column Lock Module - Disassemble - Off Vehicle in Steering Wheel and Column - Tilt.

-	To assemble the lock module assembly, refer to Electronic Column Lock Module - Assemble - Off Vehicle in Steering Wheel and Column - Tilt.

•	With Tilt Wheel and Floor Shift

-	To disassemble the lock module assembly, refer to Electronic Column Lock Module - Disassemble - Off Vehicle in Steering Wheel and Column - Tilt.

-	To assemble the lock module assembly, refer to Electronic Column Lock Module - Assemble - Off Vehicle in Steering Wheel and Column - Tilt.

•	With Standard Wheel and Column Shift

-	To disassemble the lock module assembly, refer to Electronic Column Lock Module - Disassemble - Off Vehicle in Steering Wheel and Column - Standard.

-	To assemble the lock module assembly, refer to Electronic Column Lock Module - Assemble - Off Vehicle in Steering Wheel and Column - Standard.

•	With Standard Wheel and Floor Shift

-	To disassemble the lock module assembly, refer to Electronic Column Lock Module - Disassemble - Off Vehicle in Steering Wheel and Column - Standard.

-	To assemble the lock module assembly, refer to Electronic Column Lock Module - Assemble - Off Vehicle in Steering Wheel and Column - Standard.

Is the repair complete?

Go to Step 6

Reconnect all the previously disconnected connectors and the components.
Ensure that the ignition switch is ON.
Connect the scan tool.
Clear the DTCs.
Perform 1 of the following Passlock reprogramming procedures:

•	PASSLOCK Reprogramming Seed and Key

•	PASSLOCK Reprogramming Auto Learn

Is the repair complete?

Go to Diagnostic System Check - Theft Deterrent