Invalid Data Received From Park Brake Control Module
What does U0409 mean?
The U0409 code means the vehicle's onboard diagnostic system has detected: Invalid Data Received From Park Brake Control Module. This is a moderate severity code.
Common Symptoms
- Electronic parking brake warning light on
- Parking brake applies or releases unexpectedly
- Parking brake status indicator incorrect
- Hill hold assist malfunction
- Auto hold feature not working correctly
Probable Causes (Ranked by Likelihood)
- Park brake module sending invalid position data Very High
- Park brake actuator motor position sensor fault High
- Wiring issue to park brake actuator Moderate
- Park brake switch sending incorrect signals Low
Step-by-Step Diagnostic Procedure
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Check park brake actuator motor operation with a scan tool
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Monitor park brake position sensor data for invalid readings
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Inspect wiring to the rear brake calipers with electronic actuators
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Verify the park brake switch on the console is functioning
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Check for related brake system codes
Frequently Asked Questions
Can I drive with code U0409?
Drive short distances only. The electronic parking brake may behave unpredictably. Park on flat surfaces and use wheel chocks until repaired.
What causes U0409?
Typically a failing park brake actuator position sensor or the park brake module itself. These components are at the rear brakes and exposed to the elements.
Is U0409 expensive to fix?
Expect $200 to $800. Park brake actuator replacement at the calipers is the most common fix. Module replacement with programming costs more.