Lost Communication With Chassis Control Module
What does U0172 mean?
The U0172 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Chassis Control Module. This is a moderate severity code.
Common Symptoms
- Suspension warning light illuminated
- Ride quality changes noticeably
- Electronic damping system inoperative
- Vehicle sits at abnormal ride height
- Stability control warning light on
Probable Causes (Ranked by Likelihood)
- Failed chassis control module Very High
- CAN bus wiring damage under the vehicle High
- Corroded module connector from road salt or water Moderate
- Module power supply issue Low
Step-by-Step Diagnostic Procedure
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Check power and ground at the chassis control module
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Inspect CAN bus wiring under the vehicle for damage
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Look for corrosion at the module connector
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Scan for related suspension and stability codes
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Measure CAN bus signal integrity at the module
Frequently Asked Questions
Can I drive with code U0172?
Drive only short distances carefully. The suspension may not respond correctly to road conditions and handling could be compromised.
What causes U0172?
Typically a failed chassis control module or corroded wiring. Vehicles with electronic or air suspension are more prone to this code.
Is U0172 expensive to fix?
Expect $300 to $1000. Module replacement on luxury SUVs is on the higher end due to the complexity of electronic suspension systems.