Lost Communication With Chassis Control Module
The U0172 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Chassis Control Module. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $1000 (parts and labor)
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
- 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
-
Check power and ground at the chassis control module
-
Inspect CAN bus wiring under the vehicle for damage
-
Look for corrosion at the module connector
-
Scan for related suspension and stability codes
-
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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