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 » U0473

Code U0473

Symptoms

• Check engine light is on

• Possible performance issues

• Communication error messages on diagnostic tools

Common Causes

• Faulty control module

• Wiring issues or poor connections

• Software or programming error

Glossary

PCM: Powertrain Control Module

OBD-II: On-Board Diagnostics, Second Generation

Related Codes

• U0100

• U0121

Laymans terms

This code means that the car's computer is having trouble talking to another part of the car. It's like when two people can't understand each other because they speak different languages.

Explanation

The U0473 code indicates a communication error between the vehicle's control modules.

Technical description

U0473 is a diagnostic trouble code (DTC) for 'Invalid Data Received From Powertrain Control Module (PCM)'. This means that the vehicle's control modules are not communicating properly, possibly due to a data mismatch or corrupted message.

Diagnosis steps

• Use a diagnostic scanner to confirm the code

• Inspect wiring and connections between modules

• Check for software updates or reprogramming needs

Repair procedures

• Repair or replace faulty wiring

• Reprogram or update control module software

• Replace the defective control module

Tools required

• OBD-II scanner

• Multimeter

• Wiring diagrams

Estimated repair cost

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regular maintenance checks

• Ensure software is up to date

• Inspect wiring for damage

Error code type

Communication Error

User experience recommendations

• Consult a professional mechanic for diagnosis

• Do not ignore the check engine light

• Keep vehicle software updated

Warranty information

Check with the vehicle manufacturer for warranty coverage on control modules.

Historical data

This code has been associated with communication issues in modern vehicles as they rely more on electronic control modules.

Urgency level

Moderate – While the vehicle may still operate, it is important to address this issue to prevent further problems.

Legal and safety notice

Driving with unresolved communication errors may lead to unexpected vehicle behavior. Always ensure your vehicle is safe to operate.

Testing conditions

• Vehicle must be running

• Diagnostic scanner connected

Component location

Control modules are typically located under the dashboard or in the engine compartment.

FAQs

Q: Can I drive my car with a U0473 code?
A: It's possible, but not recommended. The vehicle may not perform optimally and could develop further issues.

Q: How do I clear a U0473 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue persists, further diagnosis is needed.

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

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