U0420 on Gmc Canyon
Invalid Data Received From Power Steering Control Module A
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Gmc Canyon context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for U0420.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What U0420 Means on Your Gmc Canyon
U0420 is a diagnostic trouble code indicating: Invalid Data Received From Power Steering Control Module A. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Real Gmc Canyon Owner Reports
Source: NHTSA Complaints Database
"Would randomly experience loss of electrical power steering assist. loss of assist would happen at all times, while stationary, while driving straight, while turning, at hi low or no speeds. needed to park vehicle and turn off and restart vehicle to restore power steering assist."
"Driving down the road and power (electric) steering goes out. Power steering and traction control warnings lit up on the display. Almost impossible to steer without power steering. I am lucky that this didn't cause an accident-- very scary."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Gmc Canyon
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.