U0420 GMC 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 GMC 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.
Code U0420 GMC Description
What are the Possible Causes of the DTC U0420 GMC?
- 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 GMC?
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 GMC 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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Frequently Asked Questions about U0420 GMC Code
1. What are the common symptoms of the OBDII code U0420 in a GMC vehicle?
The common symptoms include loss of power steering assistance, illuminated warning lights on the dashboard, stiff or heavy steering, and difficulty in steering.
2. What can cause the OBDII code U0420 "Invalid Data Received From Power Steering Control Module" in a GMC?
Possible causes include a faulty power steering control module, damaged wiring or connectors, corroded electrical connections, or a communication error between modules.
3. How can I diagnose the OBDII code U0420 in my GMC vehicle?
Diagnosis typically involves scanning the vehicle's onboard computer with an OBDII scanner to retrieve the specific code, checking the power steering control module for any visible damage, and inspecting the wiring and connectors for signs of wear or corrosion.
4. Can driving with the OBDII code U0420 in a GMC be dangerous?
Driving with this code can be dangerous as it may result in unpredictable power steering assistance, making it harder to control the vehicle, especially in emergency situations. It is recommended to address the issue promptly.
5. What are the repair options for fixing the OBDII code U0420 in a GMC?
Repair options may include replacing the power steering control module, repairing or replacing damaged wiring or connectors, cleaning corroded electrical connections, or reprogramming the modules to resolve communication errors.
6. Is it possible to reset the OBDII code U0420 in a GMC without fixing the underlying issue?
While clearing the code using an OBDII scanner may temporarily turn off the warning light, the issue causing the code will persist, potentially leading to safety risks and further damage if left unresolved.
7. How much does it typically cost to repair the OBDII code U0420 in a GMC?
The cost of repairing this code can vary depending on the specific cause of the issue, the extent of the damage, and labor rates. It is advisable to consult a professional mechanic for an accurate diagnosis and cost estimate.
8. Can I prevent the OBDII code U0420 from appearing in my GMC?
Regular maintenance, including checking the electrical connections, keeping the power steering system in good condition, and addressing any warning lights promptly, can help prevent the occurrence of this code.
9. Are there any recalls or technical service bulletins related to the OBDII code U0420 in GMC vehicles?
It is advisable to check with the manufacturer or authorized GMC service centers for any recalls or technical service bulletins related to the OBDII code U0420 to see if your vehicle is affected.
10. How urgent is it to address the OBDII code U0420 in a GMC?
Addressing this code promptly is recommended to ensure the safe operation of the vehicle and prevent further damage to the power steering system. Ignoring the issue can lead to potential safety hazards and more costly repairs in the long run.
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