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 » U0517

Code U0517

Symptoms

• Check Engine Light is on

• Malfunction indicator lamp (MIL) illuminated

• Vehicle may not start or run properly

Common Causes

• Faulty control module

• Damaged wiring or connectors

• Network communication error

Glossary

Control Module: An electronic device in the vehicle that manages specific functions.

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

Related Codes

• U0100

• U0121

Laymans terms

This code means that one of the car's computers isn't talking to another computer like it should. It's like when two friends have a misunderstanding and need to clear things up.

Explanation

U0517 indicates a communication issue between control modules in the vehicle.

Technical description

The U0517 code is set when there is a communication error between the vehicle's control modules, specifically related to a 'Invalid Data Received' from a particular module. This could be due to a faulty module, wiring issues, or network problems.

Diagnosis steps

• Use an OBD-II scanner to confirm the code.

• Inspect the wiring and connectors related to the control modules.

• Test the communication network for faults.

Repair procedures

• Repair or replace damaged wiring or connectors.

• Replace the faulty control module.

• Reprogram or update the vehicle's software if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Diagnostic software

Estimated repair cost

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regularly inspect wiring and connectors.

• Ensure software updates are performed.

• Avoid moisture exposure to electronic components.

Error code type

Communication Error

User experience recommendations

• Have the vehicle checked by a professional mechanic.

• Do not ignore the Check Engine Light.

• Consider regular maintenance checks.

Warranty information

Check with your vehicle manufacturer for warranty coverage on electronic components.

Historical data

U0517 is a relatively common code that has been associated with communication issues in modern vehicles as they rely more on networked control modules.

Urgency level

Moderate – While the vehicle may still operate, ignoring the issue could lead to further problems.

Legal and safety notice

Operating a vehicle with unresolved diagnostic codes may lead to decreased performance and safety issues.

Testing conditions

• Vehicle ignition on

• Engine running

Component location

The control modules are typically located throughout the vehicle, often under the dashboard or in the engine compartment.

FAQs

Q: What does a U0517 code mean?
A: It means there is a communication problem between the vehicle's control modules.

Q: Can I drive my car with a U0517 code?
A: It's possible, but it's recommended to have it checked to prevent further issues.

Last updated: Mar 1, 2026 • Source: internal database

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