Code Definition

U1437 — ASTC-ECU Internal Diagnosis - CAN Data Range Error

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

About U1437

U1437 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 U1437 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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.

U1437 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

U1437 belongs to a group of internal diagnosis codes used by the Mitsubishi Active Stability and Traction Control system, and it is set when the ASTC ECU receives a CAN message whose data value falls outside the range it expects for that signal. The message arrives intact at the protocol level, so this is a plausibility failure rather than a wiring or timeout failure, and it means the sending module reported a value the stability control module cannot act on. These codes characteristically store as a group, so U1437 commonly appears together with U1406, U1426 and U1430, and members are reporti...

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