MC-10179907-9999 PDF

A service bulletin that addresses an engine diagnosis issue related to a warning lamp activation due to fault code P012800. It details that the coolant temperature is below the specified temperature, causing the engine coolant to warm up slowly. Guidelines for diagnosing and remedying the issue include checking the engine control unit for updates and replacing the thermostat if necessary. Additional diagnostics such as performing a guided test and verification steps are also provided. The bulletin pertains to engines 270 and 274 and includes operation codes for quick tests and thermostat replacements.