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 Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B3055 00
- No Transponder Modulation or No Transponder

Circuit/System Description

When a keyless entry transmitter is inserted into the transmitter pocket/slot and the ignition mode switch is pressed, the transponder embedded in the transmitter is energized by the immobilizer antenna exciter coil. The transponder transmits a signal to the Body Control Module (BCM). The BCM then compares this value to a value stored in memory. If the value is correct, the BCM will send the prerelease password via the serial data circuit to the Engine Control Module (ECM). If the learned key code does not match or a transponder value is not received, the BCM will send the start disable password to the ECM.

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 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 transmitter.

* A history DTC will be cleared after 100 malfunction-free ignition cycles.

Diagnostic Aids

* Because DTC B3055 may be caused by a malfunctioning keyless entry transmitter, it is necessary to have all available transmitters at the time of diagnosis. A possible scenario would be a customer leaving the vehicle with a spare transmitter during the service visit, but the transmitter which they use everyday, not the spare transmitter, is the cause of the DTC. Not having all available transmitters in this instance would result in the customer concern not being duplicate or a misdiagnosis.

* Ensure that the immobilizer control module is properly installed and fully seated. An audible and/or tactile click will indicate that the immobilizer control module is fully seated. To ensure proper transponder communication, the transmitter must be in a specific location in relation to the immobilizer control module. If the immobilizer control module is not fully seated, transponder communication may not occur and DTC B3055 will set.

Reference Information

Schematic Reference

Immobilizer Schematics Immobilizer Schematics

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Immobilizer Description and Operation Immobilizer

Electrical Information Reference

* Circuit Testing 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 References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify that DTC B1370, B1380, or B1441 is not set.

• If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

• If none of the DTCs are set

3. Verify the scan tool Body Control Module Accessory parameter changes between Active and Inactive when turning the ignition ON and OFF.

• If the parameter does not change
Refer to Vehicle Will Not Change Power Mode Vehicle Will Not Change Power Mode.

• If the parameter changes

4. Verify all available keyless entry transmitters are correct for the vehicle. This can be accomplished by comparing the part number that is laser etched on the transmitter to the part number listed in the parts catalog.

• If a transmitter is not correct
Replace the transmitter.

• If all transmitter are correct

5. Remove the battery from each of the available keyless entry transmitters.

6. Verify that DTC B3055 does not set while attempting to start the vehicle which each available keyless entry transmitter. To start the vehicle with the transmitter battery removed, the transmitter must be placed in the transmitter pocket/slot.

• If DTC B3055 sets when attempting to start the vehicle with only one of the available transmitters
Replace the appropriate transmitter.

• If DTC B3055 sets when attempting to start the vehicle with all of the available transmitters
Replace the K89 Immobilizer Control Module.

• If DTC B3055 does not set

7. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Control Module References for Immobilizer Control Module replacement, programming, and setup