Chevrolet U1026: No Communication With Transfer Case Shift Control Module

Is your scanner showing Chevrolet U1026?
No worries. We'll show you what it means and how to deal with it.

Presented by

Randy Worner

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Chevrolet U1026: No Communication With Transfer Case Shift Control Module

OVERVIEW

Severity

Medium

DIY Difficulty Level

Intermediate

Repair Cost

$75-$200

Can I Still Drive?

Yes (Short-term only)

What Does The Chevrolet U1026 Code Mean?

Key on, and a message from a learned ID number was not detected for the five seconds. Modules on the Class 2 circuit monitor for data communications during vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter.

Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1026 is set.