Chevrolet U1133: Lost Communication With DVD Player

Is your scanner showing Chevrolet U1133?
No worries. We'll show you what it means and how to deal with it.

Presented by

Randy Worner

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Chevrolet U1133: Lost Communication With DVD Player

OVERVIEW

Severity

Medium

DIY Difficulty Level

Intermediate

Repair Cost

$75-$200

Can I Still Drive?

Yes

What Does The Chevrolet U1133 Code Mean?

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal 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) U1133 is set.

What Are The Potential Causes Of The Chevrolet U1133 Code?

Use the DTC Descriptor list above to determine the module which is not communicating.
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse.