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 » U0354

Code U0354

Symptoms

• Check Engine Light is on

• Vehicle may not run smoothly

• Possible loss of certain vehicle functions

Common Causes

• Faulty control module

• Damaged wiring or connectors

• Software issue in the control module

Glossary

OBD-II: On-Board Diagnostics, a standardized system for vehicle diagnostics.

Control Module: An electronic component that manages various functions in the vehicle.

Related Codes

• U0100

• U0121

Laymans terms

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

Explanation

The U0354 code indicates a communication error with a control module in the vehicle.

Technical description

U0354 is a diagnostic trouble code (DTC) for 'Invalid Data Received From Control Module 'A''. This code is set when the vehicle's control modules are unable to communicate properly with each other, resulting in invalid data being transmitted.

Diagnosis steps

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

• Inspect wiring and connectors for damage.

• Check for software updates for the control module.

Repair procedures

• Repair or replace damaged wiring or connectors.

• Reprogram or update control module software.

• Replace the faulty control module 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 check and maintain vehicle wiring.

• Keep software up to date.

• Avoid moisture exposure to electronic components.

Error code type

Communication Error

User experience recommendations

• Have the vehicle inspected by a professional.

• Do not ignore the check engine light.

• Keep a record of all repairs and updates.

Warranty information

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

Historical data

U0354 is a relatively common code in vehicles with advanced electronic systems, often related to communication issues between modules.

Urgency level

Moderate – It should be addressed soon to prevent further issues.

Legal and safety notice

Ignoring this code could lead to safety issues or vehicle malfunction. Always consult a professional for repairs.

Testing conditions

• Vehicle at operating temperature

• All electrical systems active

Component location

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

FAQs

Q: Can I drive with a U0354 code?
A: It's possible, but not recommended as it may lead to further issues.

Q: Does U0354 affect fuel efficiency?
A: It might, as communication errors can impact engine performance.

Last updated: Oct 7, 2025 • Source: internal database

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