Invalid Data Received From Steering Effort Control Module
What does U0408 mean?
The U0408 code means the vehicle's onboard diagnostic system has detected: Invalid Data Received From Steering Effort Control Module. This is a critical severity code.
Common Symptoms
- Power steering assist intermittent
- Steering effort changes unexpectedly
- Power steering warning light on
- Steering may feel heavy then suddenly light
- Steering wheel vibration at certain speeds
Probable Causes (Ranked by Likelihood)
- EPS module sending corrupted torque data Very High
- Steering angle sensor sending invalid data High
- Wiring issue to electric power steering motor Moderate
- Failing EPS motor causing data inconsistency Moderate
Step-by-Step Diagnostic Procedure
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Check steering angle sensor calibration and data output
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Monitor EPS torque sensor data for erratic values
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Inspect wiring to the EPS motor and module
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Check battery voltage under load (EPS is sensitive to voltage drops)
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Verify the steering column connector is secure
Frequently Asked Questions
Can I drive with code U0408?
Drive only short distances at low speed. Unpredictable steering assist changes are dangerous, especially at highway speeds or during emergency maneuvers.
What causes U0408?
Usually a failing EPS module or steering angle sensor sending corrupted data. Low battery voltage can also cause intermittent EPS issues.
Is U0408 expensive to fix?
Costs range from $300 to $1200. Check the battery first as a weak battery is a common trigger. EPS column or rack replacement is the most expensive fix.