Cadillac U1305: Class 2 Data Link High or Low

Is your scanner showing Cadillac U1305?
No worries. We'll show you what it means and how to deal with it.

Presented by

Randy Worner

00:00/00:00

Cadillac U1305: Class 2 Data Link High or Low

OVERVIEW

Severity

Medium

DIY Difficulty Level

Intermediate

Repair Cost

$75-$200

Can I Still Drive?

Yes (Short-term only)

What Does The Cadillac U1305 Code Mean?

Key on or engine running; system voltage supplied to the module is in the normal operating voltage range, vehicle power mode requires serial data communication to occur, and the PCM did no detect any valid messages on the Class 2 circuit.

What Are The Potential Causes Of The Cadillac U1305 Code?

Below are some potential causes of this DTC:

Class 2 serial data line has either a high or low voltage condition on the circuit, and the module cannot identify the fault
One or more modules on Class 2 line has an short to power
One or more modules on the Class 2 line has a short to ground