B3055

DTC B3055

Circuit Description

When an ignition key is inserted into the ignition lock cylinder and switch to ON, 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, learned key code. If the value is correct the BCM sends the fuel enable password via the serial data circuit to the powertrain control module (PCM).

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3055 No Transponder Modulation/No Transponder

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The BCM is unable to measure the ignition key transponder value. This may be due to a damaged or missing transponder, a non PASS-Key III (PK3) key, or a damaged theft deterrent exciter module.

Action Taken When the DTC Sets

Important: If the BCM is unable to measure the ignition key transponder value for 30 consecutive seconds, after the vehicle has started, the BCM will enter a fail enable state. The BCM sends a message via the serial data circuit to the driver information center (DIC) to display the Service Theft - VTD Fail Enable message. The vehicle will not stall or stop running. If the BCM is in a fail enable state when the ignition is turned to OFF, it will remain fail enabled until the next time the vehicle is started. If the BCM is fail enabled, the vehicle theft deterrent (VTD) system is NOT active and the vehicle will start. The BCM WILL send its enable password even if a transponder value is not received. The BCM will remain fail enabled until the module measures a valid key transponder value for 5 consecutive ignition cycles then the BCM will exit the fail enable state.

* The vehicle will not start.
* The BCM sends the fuel disable password via the serial data circuit to the PCM.
* The DIC displays Starting Disabled Due To Theft message.

Conditions for Clearing the MIL/DTC

* The BCM clears the current status of the DTC when it senses a valid key transponder value for 5 consecutive ignition cycles.
The BCM clears the history status of the DTC after 100 fault-free ignition cycles.
* The DTC can be cleared by using a scan tool.

Test Description

Step 1 - Step 14:

Step 15 - Step 16:

The numbers below refer to the step numbers on the diagnostic table:
3. This step verifies the condition for setting DTC B3055 is current.
4. The key must be a PASS-Key III key with an operating transponder for the VTD system to work.
5. The only method to confirm whether the transponder in the key or the BCM is malfunctioning is to try an alternative PASS-Key III key in the system. The vehicle was delivered with 2 keys.
6. The possibility is unlikely that more than one key will be defective. If all keys do not work, the BCM or the theft deterrent exciter module is malfunctioning.
7. If the vehicle has a malfunctioning BCM that malfunctioned during an ignition cycle, the system will be in fail enabled and the vehicle will start for all keys.
9. If a new key must be tried, the key must have the proper mechanical cut and the theft deterrent control module must "learn" the transponder value.
10. If only one key was available for the vehicle and the replacement key does not work, the BCM or the theft deterrent exciter module is malfunctioning.