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 » U0098

Code U0098

Symptoms

• Warning light on dashboard

• Vehicle may not start

• Intermittent electrical issues

Common Causes

• Faulty control module

• Damaged or corroded wiring/connectors

• Network communication error

Glossary

CAN bus: A vehicle bus standard designed to allow microcontrollers and devices to communicate with each other.

Control Module: An electronic component that manages a specific function in the vehicle.

Related Codes

• U0100

• U0121

Laymans terms

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

Explanation

U0098 indicates a communication issue between the vehicle's control modules over the CAN bus.

Technical description

The U0098 code is set when there is a loss of communication with a specific control module on the vehicle's CAN bus network. This could be due to wiring issues, a faulty module, or a problem with the network itself.

Diagnosis steps

• Check for other related codes

• Inspect wiring and connectors for damage

• Test the affected control module

Repair procedures

• Repair or replace damaged wiring

• Replace faulty control module

• Clear code and test drive the vehicle

Tools required

• OBD-II scanner

• Multimeter

• Wiring repair kit

Estimated repair cost

$100 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regularly check and maintain vehicle wiring

• Avoid exposure to moisture and corrosive elements

• Perform regular vehicle diagnostics

Error code type

Network Communication Issue

User experience recommendations

• Have the vehicle inspected by a professional

• Do not ignore warning lights on the dashboard

Warranty information

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

Historical data

U0098 has been reported in vehicles with complex electronic systems where CAN bus communication is critical.

Urgency level

Moderate – It's important to address this issue to prevent further electrical problems.

Legal and safety notice

Driving with unresolved communication issues can lead to safety hazards. Always address warning lights promptly.

Testing conditions

• Vehicle parked and engine off

• Access to diagnostic tools

Component location

The affected control module is usually located under the dashboard or in the engine compartment.

FAQs

Q: What does U0098 mean?
A: It means there's a communication issue with one of the control modules in the vehicle.

Q: Can I drive with a U0098 code?
A: It's not recommended as it can lead to further electrical issues or safety concerns.

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

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