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.

🖨️

Home » OBD2 Codes » U0660

Code U0660

Symptoms

• Check Engine Light is on

• Vehicle may not start

• Loss of certain vehicle functions

Common Causes

• Faulty control module

• Damaged wiring or connectors

• Network communication failure

Glossary

CAN: Controller Area Network, a system that allows communication between different parts of the vehicle.

DTC: Diagnostic Trouble Code, a code used to identify a problem in the vehicle.

Related Codes

• U0100

• U0121

Laymans terms

Your car's computer is having trouble talking to one of its parts. It's like when your phone can't connect to the Wi-Fi.

Explanation

The U0660 code indicates a communication problem between the vehicle's control modules.

Technical description

U0660 is a diagnostic trouble code (DTC) that signifies a loss of communication with a specific module or device on the vehicle's Controller Area Network (CAN) bus. This can be due to a failure in the module itself, wiring issues, or network problems.

Diagnosis steps

• Use an OBD-II scanner to confirm the code

• Inspect wiring and connectors for damage

• Test the suspect module for proper operation

Repair procedures

• Repair or replace damaged wiring or connectors

• Replace the faulty module

• Reset the vehicle's computer system

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 check and maintain vehicle wiring

• Ensure all connectors are secure

• Keep software updated

Error code type

Network Communication Issue

User experience recommendations

• Have a professional diagnose the issue

• Avoid driving if critical systems are affected

Warranty information

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

Historical data

The U0660 code has become more common with the increase in electronic control modules in modern vehicles.

Urgency level

Moderate – It should be addressed soon to avoid potential loss of vehicle functions.

Legal and safety notice

Driving with unresolved communication issues can lead to safety risks. Ensure repairs are conducted by qualified personnel.

Testing conditions

• Vehicle ignition is on

• All modules are powered

Component location

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

FAQs

Q: What does U0660 mean?
A: It means there is a communication issue with one of the vehicle's control modules.

Q: Can I drive with a U0660 code?
A: It's best to have it checked as soon as possible, especially if critical systems are affected.

Last updated: Oct 29, 2025 • Source: internal database

Diagnose Your Check Engine Light