GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The ignition key has to have a key code to be able to start the vehicle. If a key code was partially unmatched when the key is inserted into the key cylinder, DTC B2794 will set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2794 Unmatched Encryption Code

Conditions for Running the DTC

This DTC shall run when key is inserted into key cylinder.

Conditions for Setting the DTC

The key does not match registered code.

Action Taken When the DTC Sets

The engine will not start.

Conditions for Clearing the DTC

The DTC will clear when conditions for setting the DTC have been repaired.

Step

Action

Yes

No

Schematic Reference: Immobilizer Schematics

Connector End View Reference: Component Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Important: New key will have to be registered.

Replace the key.

Did you complete the replacement?

Go to Step 3

--

3

  1. Use the scan tool in order to clear the DTC.
  2. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK