Code Definition

U1538 — Lost Communication With LIN Bus 3 Signal

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

About U1538

U1538 is a manufacturer-specific network communication diagnostic trouble code recorded for Holden vehicles. It belongs to the U-prefix family of codes, which covers inter-module network communication (CAN, LIN, FlexRay, or similar) faults.

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.

U1538 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

LIN Bus 3 is a single wire, low speed serial sub network on which a master module exchanges data with slave devices such as switches, sensors, or small actuators assigned to that bus. DTC U1538 is set when the master module does not detect valid LIN Bus 3 messages within a calibrated time window while the master itself remains operational. The fault usually points to an open or shorted LIN wire, loss of power or ground at a slave device, or an internal fault in a slave or master node. Depending on which devices sit on Bus 3, the driver may notice the affected feature stops working and a relate...

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