Engine-Codes - Generic - U1899

U1899 - Starter/Generator Control Module Lost Communication With Powertrain Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

U1899 Possible Causes

  • Faulty Powertrain Control Module (PCM)
  • Powertrain Control Module harness is open or shorted
  • Powertrain Control Module circuit poor electrical connection
  • Faulty Starter/Generator Control Module (SGCM)

How is the U1899 code repair?

Start by checking 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.

What is the cost to diagnose the U1899 code

Labor: 1.0

The cost to diagnose the U1899 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.
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Possible Symptoms

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

U1899 Meaning

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.

More Information

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Information for specific makes

  • U1899 BUICK Starter/Generator Control Module Lost Communication With Powertrain Control Module
  • U1899 CADILLAC Starter/Generator Control Module Lost Communication With Powertrain Control Module
  • U1899 CHEVROLET Starter/Generator Control Module Lost Communication With Powertrain Control Module
  • U1899 GMC Starter/Generator Control Module Lost Communication With Powertrain Control Module

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