AutoCodes – Buick – U0420 Buick

U0420 Buick Code - Invalid Data Received From Power Steering Control Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Power Steering Control Module, Power Steering Control Module harness is open or shorted, Power Steering Control Module circuit poor electrical connection. 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: U0420 Buick indicates Invalid Data Received From Power Steering Control Module.
Common causes: Common causes include Faulty Power Steering Control Module, Power Steering Control Module harness is open or shorted, Power Steering Control Module circuit poor electrical connection.
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.

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Code Popularity 2,953

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0420 Buick Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. Some devices are constantly receiving information from other devices through serial data communication network. The invalid data Diagnostic Trouble Code (DTC) will be set when a receiving device detects a discrepancy in the information it receives from the Power Steering Control Module causing its integrity to be questioned.

OBDII Code U0420 Buick - Invalid Data Received From Power Steering Control Module - AutoCodes.com — U0420 Buick Code - Invalid Data Received From Power Steering Control Module

What does this mean?

What are the Possible Causes of the DTC U0420 Buick?

Faulty Power Steering Control Module
Power Steering Control Module harness is open or shorted
Power Steering Control Module circuit poor electrical connection

How to Fix the DTC U0420 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0420 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.

Frequently Asked Questions about U0420 Buick Code

1. What are common symptoms of the U0420 OBDII code in a Buick related to the Power Steering Control Module?

The common symptoms include loss of power steering assist, stiff steering, illuminated power steering warning light on the dashboard, and potential communication issues with other vehicle modules.

2. What are the possible causes of the U0420 OBDII code in a Buick indicating Invalid Data Received From Power Steering Control Module?

Potential causes may include a faulty power steering control module, damaged wiring or connectors in the power steering system, software issues, or a malfunctioning vehicle communication network.

3. How can I diagnose the U0420 OBDII code in my Buick associated with the Power Steering Control Module?

Diagnosis typically involves using a professional OBDII scanner to retrieve the code, checking for any other related codes, inspecting the power steering control module, testing the wiring and connectors for continuity, and verifying communication between modules.

4. Can the U0420 OBDII code in a Buick related to the Power Steering Control Module be repaired at home?

Depending on your level of automotive expertise, repairing this code may be possible at home by checking and repairing wiring connections, resetting the power steering control module, or updating the module's software. However, complex issues may require professional diagnosis and repair.

5. What are some tips for repairing the U0420 OBDII code in a Buick due to Invalid Data Received From Power Steering Control Module?

Some repair tips include ensuring all connectors are properly seated and free of corrosion, inspecting wiring for damage, performing a power steering system reset if applicable, and consulting technical service bulletins for known issues related to this code.

6. Is it safe to continue driving my Buick with the U0420 OBDII code triggered by the Power Steering Control Module issue?

It is not recommended to continue driving the vehicle with the U0420 code active, as it can lead to compromised power steering functionality and potentially unsafe driving conditions. Prompt diagnosis and repair are advised.

7. How much does it typically cost to repair the U0420 OBDII code related to the Power Steering Control Module in a Buick?

The cost of repairing this code can vary depending on the underlying issue. Simple fixes like resetting the power steering module or repairing wiring may be relatively inexpensive, while replacing a faulty module or addressing complex electrical problems can be more costly.

8. Can a malfunctioning battery or alternator cause the U0420 OBDII code to appear in a Buick related to the Power Steering Control Module?

Yes, a weak or failing battery or alternator can potentially cause communication errors within the vehicle's network, leading to the U0420 code. It is advisable to ensure the battery and charging system are in good condition when diagnosing this code.

9. Will resetting the OBDII code with a scanner make the U0420 code related to the Power Steering Control Module disappear permanently?

Resetting the code may clear it temporarily, but if the underlying issue causing the U0420 code is not addressed, the code is likely to reappear after driving the vehicle for a certain distance or under specific conditions. It is important to diagnose and fix the root cause of the code.

10. Can a software update fix the U0420 OBDII code triggered by the Power Steering Control Module issue in a Buick?

In some cases, a software update provided by the manufacturer may resolve the U0420 code related to the Power Steering Control Module. It is recommended to check with a dealership or authorized service center to see if any updates are available for your vehicle.