What Does U0420 Mean?
A control module received corrupted or implausible data from the Power Steering Control Module via the vehicle communication network. This affects electronic or electro-hydraulic power steering system coordination with other vehicle systems.
Common Causes
35%
Faulty power steering control module with internal component failure
30%
Damaged wiring or corroded connectors in power steering module circuit
20%
CAN bus network communication fault affecting data integrity
10%
Power supply issues or low voltage to steering control module
5%
Software corruption or calibration mismatch in steering module
Diagnostic Steps
1
Step 1: Check if power steering control module is communicating on network and responding to scan tool
2
Step 2: Inspect power steering module connectors for corrosion, bent pins, or water damage
3
Step 3: Test power and ground circuits to steering module, verify voltage is within specifications
4
Step 4: Check CAN bus network integrity and signals between steering module and other control modules
5
Step 5: Reprogram steering control module if hardware is good, replace module if faulty
Estimated Repair Cost
$200 - $1,800
Parts + labor, varies by vehicle and location
A control module received corrupted or implausible data from the Power Steering Control Module via the vehicle communication network. This affects electronic or electro-hydraulic power steering system coordination with other vehicle systems.
The most common cause of U0420 (Invalid Data Received From Power Steering Control Module) is: Faulty power steering control module with internal component failure
Typical repair costs for U0420 range from $200 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Power steering assistance may be reduced or lost, requiring increased steering effort. Vehicle remains controllable but may be difficult to maneuver at low speeds.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0420 to identify the root cause.
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Quick Info
Category
Network
System
Power Steering System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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