DTC Descriptor
DTC B3055 : No Transponder Modulation or No Transponder
Diagnostic Fault Information
Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
Circuit/System Description
When an ignition key is inserted into the ignition lock cylinder and the ignition is switched 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 theft deterrent module (TDM). The TDM then compares this value to a value stored in memory. If the values match, the TDM will send the fuel enable password via the serial data circuit to the engine
control module (ECM). If the transponders unique value is incorrect, the TDM will send the fuel disable password to the ECM.
Conditions for Running the DTC
Ignition is in the Accessory or Run position.
Conditions for Setting the DTC
The TDM is unable to measure the ignition key transponder value.
Action Taken When the DTC Sets
• | Vehicle starting will be disabled. |
• | The security indicator will be illuminated. |
Conditions for Clearing the DTC
• | A current DTC will be cleared when the TDM detects a valid transponder value from the ignition key. |
• | A history DTC will be cleared after 100 malfunction free ignition cycles or when a scan tool is used to clear DTCs. |
Diagnostic Aids
A damaged or missing transponder, a non-Passkey III+ (PK3+) key, or a damaged exciter will cause DTC B3055 to set.
Reference Information
Schematic Reference
Theft Deterrent System Schematics
Connector End View Reference
Theft Deterrent System Connector End Views
Description and Operation
Vehicle Theft Deterrent (VTD) Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Important: When using this diagnostic, more than one vehicle key is required to ensure proper diagnosis. If more than one key is not available at the time of service, contact the customer and ask if any other keys can be provided
for service. If unavailable, a new second key can be created.
- Inspect all available vehicle keys that they are correct PK3+ keys and that the molded head is undamaged.
⇒ | If damaged or not a correct PK3+ key, replace the key. |
- While viewing DTCs with a scan tool, attempt to start the vehicle using all of the available keys. The vehicle should start with all available keys.
⇒ | If only one key results in inoperative starting and DTC B3055 is set as current, replace the suspect key. |
⇒ | If all available keys result in inoperative starting and DTC B3055 is set as current, replace
the TDM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the repair.
Important: Because of how vehicle key information and theft deterrent passwords are stored within the TDM, the Set Up a New Theft Deterrent Module procedure must be performed prior to the removal and replacement of the TDM if the
vehicle keys are being reused. Performing the setup procedure first allows the scan tool to extract the key information and passwords from the old TDM prior to its removal. Failure to perform this step will result in the failure to learn the existing vehicle
keys and new vehicle keys will be required when replacing the TDM.
If the existing vehicle keys are not being reused, the TDM is to be replaced prior to performing of the setup procedure.
• |
Replacing Keys
for replacing vehicle keys or adding keys when a learned master key is not available. |
• |
Adding Keys
for adding vehicle keys when a learned master key is available. |