B3055

DTC B3055

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.

DTC Descriptor
DTC B3055 00
- No Transponder Modulation or No Transponder

Circuit/System Description

When an ignition key is inserted into the ignition lock cylinder and the ignition mode is changed, the transponder embedded in the head of the key is energized by the exciter coils surrounding the ignition lock cylinder. 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 start.

Conditions for Running the DTC

Ignition is in the Accessory or Run position.

Conditions for Setting the DTC

The BCM is unable to measure the ignition key transponder value.

Action Taken When the DTC Sets

* Vehicle starting will be disabled.
* The security indicator will illuminate. A service message will be displayed in the driver information center.

Conditions for Clearing the DTC

* A current DTC will be cleared when the BCM detects a valid transponder value from the ignition key.
* A history DTC will be cleared after 100 malfunction-free ignition cycles.

Reference Information
Schematic Reference

Immobilizer Schematics
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation

Immobilizer Description and Operation Immobilizer
Electrical Information Reference

* Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module Referencesfor scan tool information

Circuit/System Verification

1. Ignition ON, verify that DTC B1370, B1380, or B1441 is not set.

• If any of the DTCs are set, refer to DTC B1370-B1379, B1380-B1389, or B1440-B1443 .

2. Observe the scan tool BCM Accessory parameter while cycling the ignition from OFF to ON. The parameter should change between Inactive and Active.

• If the parameter does not change between the specified values, refer to Power Mode Mismatch Power Mode Mismatch.

3. Inspect all available vehicle keys that they are correct vehicle keys.

• If not a correct vehicle key, replace the key.

4. While viewing the scan tool BCM Key Part Number, turn ON the ignition with each of the available vehicle keys. The parameter should display a Key Part Number for all available keys.

• If any key results in the parameter not reading a Key Part Number, replace the appropriate key.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Replacing Keys Replacing Keys