Cadillac U1153: Loss of Communications with HVAC

Is your scanner showing Cadillac U1153?
No worries. We'll show you what it means and how to deal with it.

Presented by

Randy Worner

00:00/00:00

Cadillac U1153: Loss of Communications with HVAC

OVERVIEW

Severity

Medium

DIY Difficulty Level

Intermediate

Repair Cost

$75-$200

Can I Still Drive?

Yes (Short-term only)

What Does The Cadillac U1153 Code Mean?

Conditions for setting the DTC:

The module does not receive a state of health (SOH) message back from the CCP. The module retries the request 3 times. The module then sets DTC U1153. This DTC only sets if U1300 or U1301 are not current.

Note:

DTC U1153 does not normally represent a failure within the module.
When loss of class 2 serial data communication DTCs (DTCs with a letter U prefix ) are stored as history, know all of the possible serial data DTCs set in each module before diagnosis