GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2009 🢒 Vibe - FWD 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC B279C

Circuit Description

If an engine control module (ECM) that is incompatible with the engine immobilizer system is installed, the ECM will set this DTC.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B279C Theft Deterrent System Presence Detection

Conditions for Running the DTC

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

Conditions for Setting the DTC

When ECM that is incompatible with engine immobilizer system is installed.

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

Value(s)

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
  1. Turn OFF the ignition.
  2. Install a scan tool.
  3. Turn ON the ignition, with the engine OFF.
  4. With the scan tool, recheck to see if DTC B279C resets.

Does DTC B279C reset?

--

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections

3

Replace the ECM. Refer to Control Module References for ECM replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 4

--

4
  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