SERVICE INFORMATION When disconnecting either of the 12 volt batteries on the Titan XD Diesel, follow these steps: 1. Turn the ignition OFF. 2. Wait at least 2 minutes. 3. Disconnect battery (negative cable first). NOTE: - If the above steps are not followed, DTCs P2509 and P181B may be stored. - If these codes are stored because the battery disconnection was done without waiting 2 minutes, they can be cleared, but it is not a warrantable repair. See this bulletin for more detail.
