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Engine-Codes – Generic – U0478

U0478 Code - Invalid Data Received From Restraints System Sensor 'H'

Quick Answer

The U0478 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has detected invalid data being received from the restraints system sensor 'H'. Common causes include Faulty restraints system sensor 'H', Wiring issues, such as a short or open circuit, Corrosion or damage to the sensor connector. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
U0478 indicates Invalid Data Received From Restraints System Sensor 'H'.
Common causes
Common causes include Faulty restraints system sensor 'H', Wiring issues, such as a short or open circuit, Corrosion or damage to the sensor connector.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code U0478 Description

The U0478 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has detected invalid data being received from the restraints system sensor 'H'. The restraints system sensor 'H' is responsible for monitoring and providing data related to the vehicle's restraint systems, such as airbags and seatbelt pretensioners. When the computer detects that the data being received is inaccurate or invalid, it triggers the U0478 code.

OBDII Code U0478 - Invalid Data Received From Restraints System Sensor 'H'
U0478 Code - Invalid Data Received From Restraints System Sensor 'H'

Common Causes of U0478

  1. Faulty restraints system sensor 'H'
  2. Wiring issues, such as a short or open circuit
  3. Corrosion or damage to the sensor connector
  4. Malfunction in the communication network between the sensor and the onboard computer
  5. Software issues in the vehicle's computer system

Symptoms of U0478

  1. Airbag warning light illuminated on the dashboard
  2. Seatbelt warning light stays on
  3. Inaccurate or intermittent deployment of airbags
  4. Seatbelt pretensioners not engaging properly
  5. Loss of communication with the restraints system sensor 'H'

How to Fix U0478

  1. Begin by verifying the U0478 code with a scan tool to confirm the issue.
  2. Inspect the wiring and sensor connector for any damage or corrosion and repair as necessary.
  3. Test the restraints system sensor 'H' for proper functionality and replace if faulty.
  4. Clear the DTC and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying software issues or communication network malfunctions.

Cost to Fix U0478

The typical repair costs for addressing the U0478 code can vary depending on the specific cause of the issue and the extent of repairs needed. In general, the cost of replacing a faulty restraints system sensor 'H' can range from $200 to $500, including parts and labor. Additional costs may be incurred for wiring repairs or diagnostic testing. It is important to note that labor rates at auto repair shops can vary widely, so it is advisable to obtain quotes from multiple sources to ensure a competitive price.

Need more information about the U0478 code?

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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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