What is an OBD2 code?

An OBD2 (On-Board Diagnostics) code is a diagnostic trouble code (DTC) generated by your vehicle's computer system when it detects a problem. These codes help identify specific issues with your vehicle's engine, transmission, emissions, or other systems.

How do I read OBD2 codes?

To read OBD2 codes, you'll need an OBD2 scanner. Plug it into your vehicle's OBD2 port (usually located under the dashboard), turn your key to the 'ON' position, and follow your scanner's instructions to retrieve the codes. Each code starts with a letter (P, B, C, or U) followed by four numbers.

What do the different types of OBD2 codes mean?

OBD2 codes are categorized by their first letter: P (Powertrain) for engine and transmission issues, B (Body) for interior systems like airbags, C (Chassis) for mechanical systems like brakes, and U (Network) for computer and module communication problems.

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Home » OBD2 Codes » U3502

Code U3502

Symptoms

• Check engine light on

• Erratic vehicle behavior

• Loss of certain vehicle functions

Common Causes

• Faulty control module

• Damaged wiring or connectors

• Network communication error

Glossary

Control Module: An electronic device that controls various functions in a vehicle.

Network: The system of communication between different control modules in a vehicle.

Related Codes

• U0100

• U0121

Laymans terms

This code means that the car's computer is having trouble talking to one of the parts inside the car. Imagine if your phone couldn't send messages to your friend's phone; it's kind of like that.

Explanation

U3502 indicates a communication issue between the vehicle's control modules.

Technical description

The U3502 code is triggered when there is a loss of communication between specific control modules in the vehicle's network. This could be due to a faulty module, wiring issues, or network problems.

Diagnosis steps

• Check for other related codes

• Inspect wiring and connectors for damage

• Test the communication network

Repair procedures

• Repair or replace damaged wiring

• Replace faulty control module

• Reprogram or update module software

Tools required

• OBD-II scanner

• Multimeter

• Diagnostic software

Estimated repair cost

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Ford Focus

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regular maintenance checks

• Ensure proper battery voltage

• Avoid aftermarket modifications that affect the network

Error code type

Communication Error

User experience recommendations

• Have a professional diagnose the issue

• Avoid driving if the vehicle behaves erratically

Warranty information

Check if your vehicle's warranty covers electronic components.

Historical data

This code has been reported in various models where communication networks are complex and prone to interference.

Urgency level

Moderate – Addressing this issue promptly can prevent further complications.

Legal and safety notice

Ignoring this code may lead to unsafe driving conditions. Always ensure your vehicle is safe to operate.

Testing conditions

• Vehicle at operating temperature

• All electrical systems active

Component location

The affected module is typically located within the vehicle's dashboard or engine bay.

FAQs

Q: Can I drive with a U3502 code?
A: It's best to have the issue diagnosed and repaired as soon as possible to avoid potential safety risks.

Q: Will clearing the code fix the problem?
A: Clearing the code may temporarily turn off the warning light, but it won't fix the underlying issue.

Last updated: Oct 28, 2025 • Source: internal database

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