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Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 1:  This step will diagnose a malfunction in the serial data circuits.
DTC P1381

Step Action Yes No
Did you perform the Diagnostic System Check-Engine Controls? Go to Diagnostic System Check - ABS in Antilock Brake System Go to Diagnostic System Check - Engine Controls