U0594: Invalid Data Received From Hybrid Powertrain Control Module

What it means

A receiving control module has detected invalid data from the Hybrid Powertrain Control Module. The code does not specify which data is invalid or why.

How it works

The Hybrid Powertrain Control Module coordinates hybrid powertrain operation and shares status and control information with other modules. U0594 sets when a receiving module judges data from that hybrid controller invalid; it does not identify which data failed or whether the cause is the controller, software, or network.

Common causes

Most likely first.

1. Module internal fault or sensor input drift
2. Software version mismatch after replacement
3. Gateway module routing CAN messages incorrectly

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Scan all modules and preserve freeze-frame, hybrid-system, and communication codes to identify the reporter and related faults.
2. Check the low-voltage battery and charging system, which supply the control electronics and network.
3. Inspect accessible Hybrid Powertrain Control Module connectors and wiring for damage, water entry, loose pins, or recent repair work.
4. Use a hybrid-capable scan tool to compare controller status and reported powertrain values with related module data.
5. Check gateway and network codes, then test relevant module power, ground, and communication circuits to the manufacturer’s specification.
6. If the controller or another network module was replaced, verify software compatibility and vehicle configuration before replacing hardware.

Common fixes

• Repair damaged or corroded low-voltage wiring or connectors at the hybrid controller.
• Correct a weak low-voltage battery or charging-system fault.
• Update or configure the controller if a software or replacement-module mismatch is confirmed.
• Repair a gateway or communication-network fault shown by testing.
• Replace the Hybrid Powertrain Control Module only after power, network, and software checks identify an internal fault.

Can I keep driving?

If a hybrid-system warning appears, power is limited, or the vehicle behaves unexpectedly, stop safely and follow the vehicle’s shutdown guidance; do not touch high-voltage components. Avoid relying on the vehicle for a long trip until the fault is diagnosed, since hybrid operation may be restricted.