Software Incompatibility With Cruise Control Module
What does U0304 mean?
The U0304 code means the vehicle's onboard diagnostic system has detected: Software Incompatibility With Cruise Control Module. This is a low severity code.
Common Symptoms
- Cruise control not engaging
- Adaptive cruise control unavailable
- Cruise control warning light on
- Speed limiter function not working
- Steering wheel cruise buttons unresponsive
Probable Causes (Ranked by Likelihood)
- Cruise control module software outdated after ECM update Very High
- Incompatible software between cruise and braking modules High
- Failed cruise control module software update Moderate
- Aftermarket cruise control system conflicting Low
Step-by-Step Diagnostic Procedure
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Check cruise control module software version
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Verify brake switch signal reaches the cruise control module
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Look for manufacturer TSBs about cruise control software updates
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Reflash the cruise control module to the latest calibration
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Check for related ADAS or braking system codes
Frequently Asked Questions
Can I drive with code U0304?
Yes, safe to drive. Only the cruise control function is unavailable. All other driving systems work normally.
What causes U0304?
Typically caused by a software version mismatch after an ECM or body module update. The cruise control module needs a matching software update.
Is U0304 expensive to fix?
Usually $100 to $400. A software reflash at the dealer is the most common and least expensive fix.