Engine-Codes - Cadillac - U189A Cadillac

U189A Cadillac Code - DC To DC Converter Control Module 'A' Lost Communication With Hybrid Powertrain Control Module

- Code Popularity: 321 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC U189A Cadillac?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Hybrid Powertrain Control Module
  • Hybrid Powertrain Control Module harness is open or shorted
  • Hybrid Powertrain Control Module circuit poor electrical connection
  • Faulty DC To DC Converter Control Module 'A'
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How to Fix the DTC U189A Cadillac?

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 pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the U189A Cadillac code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

What Does the U189A Cadillac Code Mean?

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.

U189A Cadillac Code - DC To DC Converter Control Module 'A' Lost Communication With Hybrid Powertrain Control Module

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