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DTC B2955

DTC B2955

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptor

DTC B2955 00

Security Sensor Data Circuit

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+ B2955 00 B2955 00 - -
Serial Data B2955 00 B2955 00 B2955 00 B2955 00
Low Reference - B2955 00 - -


Circuit/System Description

When a transmitter is inserted into the transmitter pocket and the ignition mode is changed, the transponder embedded in the transmitter is energized by the exciter coils located directly below the transmitter pocket. The energized transponder transmits a signal that contains its unique value, which is received by the body control module (BCM). The BCM then compares this value to a value stored in memory. If the value is not correct, the BCM disables engine starting.

Conditions for Running the DTC

Ignition is in the Accessory or Run mode.

Conditions for Setting the DTC

The BCM detects a circuit fault between itself and the immobilizer antenna.

Action Taken When the DTC Sets


• Vehicle starting will be disabled.

• The security indicator in the instrument cluster will be illuminated. A service message will be displayed in the driver information center.


Conditions for Clearing the DTC


• A current DTC will be cleared when the condition for setting the DTC are no longer present.

• A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.


Reference Information

Schematic Reference

Immobilizer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Immobilizer Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the K89 immobilizer control module.

2. Ignition OFF, test for less than 50 Ω between the low reference circuit terminal 1 and ground.

3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.

4. Connect a test lamp between the B+ circuit terminal 3 and ground.

5. While observing the test lamp, turn the ignition ON. The test lamp should illuminate or flash for three seconds.

6. If the test lamp does not illuminate or flash, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

7. Test for 11-13 V between the serial data circuit terminal 2 and ground.

8. If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

9. If greater than the specified range, test the serial data circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

10. If all circuits test normal, replace the K89 immobilizer control module. Verify DTC B2955 is not set.

11. If the DTC is set, replace the K9 BCM.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Theft Deterrent Module Replacement

• Control Module References for BCM replacement, setup, and programming