AutoCodes – Cadillac – U0594 Cadillac

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

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Hybrid Powertrain Control Module, Hybrid Powertrain Control Module harness is open or shorted, Hybrid Powertrain Control Module circuit poor electrical connection. 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 Cadillac indicates Invalid Data Received From Hybrid Powertrain Control Module.
Common causes: Common causes include Faulty Hybrid Powertrain Control Module, Hybrid Powertrain Control Module harness is open or shorted, Hybrid Powertrain Control Module circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 523

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U0594 Cadillac Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. Some devices are constantly receiving information from other devices through serial data communication network. The invalid data Diagnostic Trouble Code (DTC) will be set when a receiving device detects a discrepancy in the information it receives from the Hybrid Powertrain Control Module causing its integrity to be questioned.

OBDII Code U0594 Cadillac - Invalid Data Received From Hybrid Powertrain Control Module - AutoCodes.com — U0594 Cadillac Code - Invalid Data Received From Hybrid Powertrain Control Module

What does this mean?

What are the Possible Causes of the DTC U0594 Cadillac?

Faulty Hybrid Powertrain Control Module
Hybrid Powertrain Control Module harness is open or shorted
Hybrid Powertrain Control Module circuit poor electrical connection

How to Fix the DTC U0594 Cadillac?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0594 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U0594 Cadillac code?

Need more information on how to fix the U0594 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0594 Cadillac code diagnosed by a professional: Find a repair shop in your area

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.

Frequently Asked Questions about U0594 Cadillac Code

What does the OBDII code U0594 mean for a Cadillac?

The U0594 code indicates that the engine control module (ECM) has received invalid data from the hybrid powertrain control module (HPCM), which may affect the vehicle's hybrid system performance.

What are common symptoms of the U0594 code?

Common symptoms include warning lights on the dashboard, reduced engine power, erratic vehicle performance, and potential difficulties in starting the vehicle.

What could cause the U0594 code to trigger?

Causes may include faulty wiring or connections between the ECM and HPCM, a malfunctioning HPCM, or software issues within the control modules.

How can I diagnose the U0594 code?

To diagnose the U0594 code, use an OBDII scanner to check for additional codes, inspect wiring and connectors for damage, and test the HPCM for proper functionality.

What are some repair tips for fixing the U0594 code?

Repairs may involve repairing or replacing damaged wiring, ensuring secure connections, updating or reprogramming the HPCM, or replacing the HPCM if it's found to be faulty.

Can I drive my Cadillac with the U0594 code?

While you can drive with the U0594 code, it's not recommended, as it may lead to reduced performance and could cause further issues with the hybrid system.

How much might it cost to repair the U0594 code?

Repair costs can vary widely but may range from a few hundred dollars for wiring repairs to over a thousand dollars if the HPCM needs replacement.

Is the U0594 code serious?

Yes, the U0594 code can be serious as it affects the hybrid powertrain's performance and may lead to larger issues if not addressed promptly.

Are there any recalls related to the U0594 code for Cadillac vehicles?

It's advisable to check with your local Cadillac dealership or the National Highway Traffic Safety Administration (NHTSA) for any recalls related to specific models that may involve the HPCM or related systems.