Lost Communication With Blind Spot Detection Module
The U0181 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Blind Spot Detection Module. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $200 - $700 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Blind spot monitoring warning light on
- Blind spot indicators in mirrors not working
- Lane change assist not functioning
- Rear cross-traffic alert disabled
- Warning message on dashboard display
Probable Causes (Ranked by Likelihood)
- Failed blind spot detection radar sensor Very High
- Damaged wiring to radar sensor in rear bumper High
- Rear bumper damage misaligning sensor Moderate
- Module software fault requiring reprogramming Low
Step-by-Step Diagnostic Procedure
-
Inspect rear bumper for damage that may have affected the radar sensors
-
Check wiring to the blind spot sensors behind the rear bumper cover
-
Verify power and ground at each radar sensor module
-
Scan for related codes in the blind spot detection system
-
Check for aftermarket tow hitch or bumper accessories blocking sensors
Frequently Asked Questions
Can I drive with code U0181?
Yes, but use extra caution when changing lanes since the blind spot monitoring system is disabled. Always check mirrors and do a shoulder check.
What causes U0181?
Most commonly a failed radar sensor behind the rear bumper or sensor misalignment from a minor rear-end impact. Even a small bumper scrape can affect alignment.
Is U0181 expensive to fix?
Typically $200 to $700. Sensor replacement is the most common fix. After any repair, the sensors require calibration with a scan tool.
Sources
This page is built from documented references. Verify against your own service info before repair work.
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.