AutoCodes - Cadillac - U1890 CADILLAC

U1890 CADILLAC Code - Hybrid Control Module Lost Communication With HVAC Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|U1890 CADILLAC code possible causes

  • Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module
  • HVAC Control Module harness is open or shorted
  • HVAC Control Module circuit poor electrical connection
  • Faulty Hybrid Control Module (HCM)

|How do I fix the U1890 CADILLAC code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Cost of diagnosing the U1890 CADILLAC code

Labor: 1.0

The cost of diagnosing the U1890 CADILLAC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are U1890 CADILLAC code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|U1890 CADILLAC code description

Modules connected to the class 2 and high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The Diagnostic Trouble Code (DTC) is reported on a class 2 link to the scan tool by Powertrain Control Module (PCM) even if they may be set by different modules. The DTC will set when a node alive message has not been received from an identified module within the last 5 seconds after establishing class 2 serial data communication, or a supervised high-speed GMLAN message has not been received.
OBDII Code U1890 Cadillac - Hybrid Control Module Lost Communication With HVAC Control Module - AutoCodes.com

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|U1890 CADILLAC code comments

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