Ride Level Control Circuit Low
The U0644 code means the vehicle's onboard diagnostic system has detected: Ride Level Control Circuit Low. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $1,500
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Vehicle sitting low on one side
- Air suspension warning light
- Compressor running constantly
- Rough ride quality
Probable Causes (Ranked by Likelihood)
- Air suspension compressor failure Very High
- Air spring leak High
- Height sensor malfunction Moderate
- Ride control module communication lost Low
Step-by-Step Diagnostic Procedure
-
Check air suspension compressor operation
-
Inspect air springs for visible leaks
-
Test height sensors at each corner
-
Verify ride control module communication on CAN bus
Frequently Asked Questions
Can I drive with U0644?
Check the severity. If it affects safety systems like stability control or braking, limit driving to short distances. Comfort features like heaters or parking assist are safe to drive with.
What causes U0644?
Most commonly a faulty ride level control or damaged wiring in the communication circuit to that module.
How much does it cost to fix U0644?
Typical repair costs range from $300 - $1,500 depending on whether the module or just wiring needs repair.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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