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U1858 Code - Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus

- Code Popularity: 1,060 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC U1858?

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/EV Powertrain Control Module
  • Hybrid/EV Powertrain Control Module harness is open or shorted
  • Hybrid/EV Powertrain Control Module circuit poor electrical connection
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How to Fix the DTC U1858?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1858 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

Code U1858 Description

The Drive Motor Control Modules and the Hybrid/EV Powertrain Control Module 1 are all internal to the Power Inverter Module. The Drive Motor Control Modules communicate only with the Hybrid/EV Powertrain Control Module 1 which sends out diagnostic trouble code information to other devices regarding the Drive Motor Control Modules. All circuits to the Hybrid/EV Powertrain Control Module 1 and Drive Motor Control Modules are also internal to the Power Inverter Module and replaced as a single component.
Communication diagnostics for the serial data, including device power and ground as well as the wakeup circuits for Drive Motor Control Modules and the Hybrid/EV Powertrain Control Module 1 are all diagnosed from external sources only to the Power Inverter Module connector because any circuit fault condition within the Power Inverter Module will cause a complete replacement.
The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U1858 - Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus - AutoCodes.com
U1858 Code - Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus

Need More Information on the Code?

Need more information on how to fix the U1858 code? Get Access to Factory Service Manuals

Information for Specific Makes

  • U1858 Buick Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus
  • U1858 Cadillac Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus
  • U1858 Chevrolet Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus
  • U1858 GMC Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus

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Code U1858 comments

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