U0420: Invalid Data Received From Power Steering Control Module A
What Does U0420 Mean?
U0420 is a diagnostic trouble code indicating: Invalid Data Received From Power Steering Control Module A. This code relates to the network communication system. It has been reported in NHTSA complaints across 9 different vehicle models.
Symptoms of U0420
- ⚠️ Check engine light illuminated
- ⚠️ Loss of engine power
- ⚠️ Traction control system activated
- ⚠️ Steering issues
Common Causes
- 🔍 Wiring or connector problem
- 🔍 Sensor or control module malfunction
U0420 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"Randomly whilst driving, my dash had multiple error messages pop up and my power steering went out completely. The error messages were as follows: Service AdvanceTrac, Terrain Management System Fault, Hill Start Assist Not Available, & Power Steering Assit Fault. This keeps happening intermittently,"
— Ford Explorer owner, 08/26/2024
"I was driving my car when our of no where, the power steering stopped functioning and two messages started to flash on my dashboard: "Steering Assist Fault Service Required" and "Service Advancetrac" This was very dangerous as I could not steer the car. Once I was able to get the car home, I scan"
— Ford Fusion owner, 12/23/2022
"Hello, I was driving towards the hotel I was staying at when I heard some squeaky noises when I was turning my car (this was at night). The next day, I was leaving the parking garage, about to drive onto a main road when my power steering went. I got the car towed to the auto dealership and it tu"
— Ford Fusion owner, 03/17/2022
Source: NHTSA Complaints Database
Most Reported Vehicles for U0420
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | CHEVROLET COLORADO | |
| 2 | FORD FUSION | |
| 3 | GMC CANYON | |
| 4 | CHRYSLER 200 | |
| 5 | FORD EXPLORER | |
| 6 | FORD TAURUS | |
| 7 | JEEP CHEROKEE | |
| 8 | JEEP COMPASS | |
| 9 | GMC YUKON |
U0420 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Frequently Asked Questions
Can I drive with this code?
Will this code clear itself?
How do I find the exact cause?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Inspect wiring harness and connectors for damage, corrosion, or loose connections
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.