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 » U0606

Code U0606

Symptoms

• Check Engine Light is on

• Vehicle may not start

• Various electrical components may not function

Common Causes

• Faulty control module

• Wiring issues

• Network communication error

Glossary

Control Module: A computer in your car that controls various functions.

OBD-II: On-Board Diagnostics, a system that monitors vehicle performance.

Related Codes

• U0100

• U0101

Laymans terms

This code means that one of the computers in the car isn't talking to the others like it should. Imagine if your phone couldn't send messages to your friend's phone.

Explanation

The U0606 code indicates a communication error between control modules.

Technical description

U0606 is a diagnostic trouble code (DTC) that signifies a lost communication with the control module. This can occur when there is a failure in the data network that allows different modules in the vehicle to communicate with each other.

Diagnosis steps

• Check for other related codes

• Inspect wiring and connectors

• Test the control module

Repair procedures

• Repair or replace damaged wiring

• Replace faulty control module

• Clear codes and test drive

Tools required

• OBD-II scanner

• Multimeter

• Wiring diagram

Estimated repair cost

$150 - $1000

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regular maintenance checks

• Ensure all software updates are performed

• Avoid aftermarket modifications that affect electronics

Error code type

Communication Error

User experience recommendations

• Consult a professional mechanic

• Do not ignore the Check Engine Light

• Keep a record of all repairs

Warranty information

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

Historical data

U0606 has been a common issue in vehicles with complex electronic systems, particularly as vehicles age.

Urgency level

Moderate – This issue may not cause immediate problems but should be addressed to prevent further complications.

Legal and safety notice

Driving with a communication error may lead to safety issues if critical systems are affected. Always ensure your vehicle is safe to operate.

Testing conditions

• Vehicle in ON position

• Ensure battery is fully charged

Component location

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

FAQs

Q: Can I drive with a U0606 code?
A: It's possible, but not recommended as it may lead to further issues.

Q: How do I clear a U0606 code?
A: Use an OBD-II scanner to clear the code, but ensure the issue is fixed first.

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

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