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Some customers may experience a crank and “No start” condition accompanied by immobiliser DTC B2799 and/or B2780, B2784, B2796, B2797, B279A. A production change has been made to the Transponder key ECU. Use the following repair procedure to address these customer concerns. Repair Procedure 1. Verify that the vehicle will crank but not start. 2. Perform Health check and look for any immobiliser system DTCs. 3. If there are any immobiliser DTC’s present, test the vehicle using all keys. If the condition is present with all the keys, proceed to step 4. If the problem is isolated to a single key, refer to the repair manual diagnostic chart for the speci?c DTC. 4. Replace transponder key ECU. • 2007 / 2008 Tundra: Vehicle Interior – Theft Deterrent / Keyless Entry – Engine Immobiliser – Transponder Key ECU: “Removal” A. Location of the Transponder Key ECU Assembly is on the Air Conditioning Unit between bulkhead on the left. B. Back side of Air Conditioning Unit, where the Transponder Key ECU Assembly is mounted. C. Remove the Transponder Key ECU Assembly from the Air Conditioning Unit, by sliding the lower half out and moving downwards to release the top. 5. Install new Transponder Key ECU. • 2007 / 2008 Tundra: Vehicle Interior – Theft Deterrent / Keyless Entry – Engine Immobiliser – Transponder Key ECU: “Installation” 6. Connect TIS Techstream and clear all stored DTCs. 7. Verify Proper Operation of Immobilizer System.