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Engine-Codes – Generic – U0594

U0594 Code - Invalid Data Received From Hybrid Powertrain Control Module

Quick Answer

The U0594 diagnostic trouble code (DTC) indicates that the vehicle's engine control module (ECM) has detected invalid data coming from the hybrid powertrain control module (HPCM). Common causes include Faulty wiring or connectors between ECM and HPCM, Malfunctioning HPCM, Software glitches in ECM or HPCM. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
U0594 indicates Invalid Data Received From Hybrid Powertrain Control Module.
Common causes
Common causes include Faulty wiring or connectors between ECM and HPCM, Malfunctioning HPCM, Software glitches in ECM or HPCM.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code U0594 Description

The U0594 diagnostic trouble code (DTC) indicates that the vehicle's engine control module (ECM) has detected invalid data coming from the hybrid powertrain control module (HPCM). The hybrid powertrain control module is responsible for managing the operation of the hybrid powertrain system, which includes the electric motor, battery, and internal combustion engine. When the ECM receives incorrect or inconsistent data from the HPCM, it can lead to various performance issues and potentially cause the vehicle to enter a fail-safe mode.

OBDII Code U0594 - Invalid Data Received From Hybrid Powertrain Control Module
U0594 Code - Invalid Data Received From Hybrid Powertrain Control Module

Common Causes of U0594

  1. Faulty wiring or connectors between ECM and HPCM
  2. Malfunctioning HPCM
  3. Software glitches in ECM or HPCM
  4. Communication breakdown between ECM and HPCM

Symptoms of U0594

  1. Reduced power output
  2. Poor fuel efficiency
  3. Hesitation or stalling during acceleration
  4. Difficulty starting the engine
  5. Erratic shifting behavior

How to Fix U0594

  1. Perform a thorough inspection of the wiring and connectors between the ECM and HPCM to check for any damage or corrosion. Repair or replace any faulty components.
  2. Use a diagnostic scan tool to communicate with the HPCM and ECM to identify any software issues. Update the software as necessary to resolve any glitches.
  3. Test the communication between the ECM and HPCM to ensure proper data transfer. Repair or replace any modules that are not functioning correctly.
  4. Clear the DTC from the ECM's memory and perform a test drive to verify that the issue has been resolved.

Cost to Fix U0594

The typical repair costs for addressing the U0594 code can vary depending on the specific cause of the issue. On average, repairing wiring or connectors may cost between $100 to $300, while replacing a malfunctioning HPCM can range from $500 to $1500. Software updates and diagnostic services may add an additional $100 to $200 to the total repair bill. It's important to note that labor rates at auto repair shops can vary, and additional costs may apply based on the location, vehicle make and model, and engine type. It's recommended to consult with a professional technician to get a more accurate estimate for the repair.

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Code U0594 Information for Specific Makes

  • U0594 Buick — Invalid Data Received From Hybrid Powertrain Control Module
  • U0594 Cadillac — Invalid Data Received From Hybrid Powertrain Control Module
  • U0594 Chevrolet — Invalid Data Received From Hybrid Powertrain Control Module
  • U0594 Chrysler — Invalid Data Received From Hybrid Powertrain Control Module
  • U0594 Dodge — Invalid Data Received From Hybrid Powertrain Control Module
  • U0594 Ford — Invalid Data Received From Hybrid Powertrain Control Module
  • U0594 GMC — Invalid Data Received From Hybrid Powertrain Control Module
  • U0594 Jeep — Invalid Data Received From Hybrid Powertrain Control Module
  • U0594 Lincoln — Invalid Data Received From Hybrid Powertrain Control Module
  • U0594 Mercury — Invalid Data Received From Hybrid Powertrain Control Module
  • U0594 RAM — Invalid Data Received From Hybrid Powertrain Control Module
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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