Diagnostic Trouble Code Definitions

WARNING: This page is about a different car, the 1999 GMC Sierra and 1999 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC ⁽¹⁾

Description

U1000

Class 2 Communication Malfunction

U1026 ⁽²⁾

Loss Of Automatic Transfer Case (ATC) Class 2 Communication

U1041 ⁽²⁾

Loss Of EBCM Communication

U1255

Class 2 Serial Data Line Malfunction

U1300

Class 2 Communication Circuit Voltage Is Low

U1301

Class 2 Communication Circuit Voltage Is High

⁽¹⁾	Perform appropriate test under DIAGNOSTIC TESTS. Codes listed in this table are only for testing covered in this article. For a complete list of codes, see TESTS W/CODES INTRODUCTION article in ENGINE PERFORMANCE.

⁽²⁾	See TESTS W/CODES - DTC P1537-U1193 article in ENGINE PERFORMANCE.