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Code U0599

Symptoms

• Check engine light is on

• Vehicle may not start

• Erratic vehicle behavior or performance issues

Common Causes

• Faulty wiring or connections

• Defective control module

• Interference from other electronic devices

Glossary

OBD-II: On-Board Diagnostics, a system for self-diagnosing and reporting vehicle issues.

Control Module: A computer in the vehicle that manages various systems and components.

Related Codes

• U0100

• U0401

Laymans terms

This code means that the car's computer is having trouble talking to one of the sensors that helps control the car's systems. It's like when your phone can't connect to the internet.

Explanation

The U0599 code indicates a communication error between the vehicle's control modules and a specific sensor.

Technical description

U0599 is a network communication code that signifies a lost communication with the 'A' component of the control module. This could be due to a malfunction in the network wiring or a failure in the control module itself.

Diagnosis steps

• Check for other error codes

• Inspect wiring and connections

• Test the control module for proper operation

Repair procedures

• Repair or replace damaged wiring

• Replace the faulty control module

• Clear the error codes and test drive the vehicle

Tools required

• OBD-II scanner

• Multimeter

• Screwdriver set

Estimated repair cost

$150 - $600

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regularly inspect and maintain vehicle wiring

• Avoid adding aftermarket electronics without proper installation

• Keep software and firmware updated

Error code type

Communication Error

User experience recommendations

• Avoid driving the vehicle until the issue is resolved

• Consult with a professional mechanic

• Consider scheduling regular maintenance checks

Warranty information

Check with the vehicle manufacturer for warranty coverage on control modules and electronic components.

Historical data

U0599 is a relatively uncommon code, usually related to specific issues with vehicle communication networks.

Urgency level

Moderate – It is advisable to address this issue soon to prevent further complications.

Legal and safety notice

Driving with unresolved communication errors can lead to unexpected vehicle behavior, which may be unsafe.

Testing conditions

• Vehicle in park with engine off

• All electronic devices turned off

Component location

The affected control module is typically located in the engine bay or under the dashboard.

FAQs

Q: Can I drive my car with a U0599 code?
A: It's not recommended to drive with this code active, as it may lead to erratic vehicle behavior.

Q: How do I reset the U0599 code?
A: After repairing the issue, use an OBD-II scanner to clear the code. If the problem persists, further diagnosis is needed.

Last updated: Jan 15, 2026 • Source: internal database
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