Code Definition

U1512 — Lighting Control Sensor Checksum Error (Vehicles with Auto Light Function)

System: Network Communication  |  Type: Manufacturer-Specific  |  Make: Mitsubishi

About U1512

U1512 is a manufacturer-specific network communication diagnostic trouble code recorded for Mitsubishi vehicles. It belongs to the U-prefix family of codes, which covers inter-module network communication (CAN, LIN, FlexRay, or similar) faults.

When U1512 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Network (U) codes report communication faults between modules. When diagnosing U-codes, checking the vehicle's CAN bus integrity, supply/ground at each module, and reading all modules for related faults is usually the first step.

U1512 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This is the companion code to U1504 and covers the same lighting control sensor and LIN circuit, but it describes a different failure. Every LIN message carries a checksum, a value calculated from the data bytes that lets the receiving module confirm the message arrived intact. The ETACS ECU sets U1512 when it does receive messages from the lighting control sensor but the checksum does not match the data, meaning the sensor is talking yet what it says cannot be trusted. That distinction matters diagnostically: U1504 means silence and points at supply, ground or an open circuit, whereas U1512 m...

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