OBD Guide
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U11FB

Lost Communication With Left Blind Spot Sensor

U11FB is an OBD-II diagnostic trouble code meaning: Lost Communication With Left Blind Spot Sensor. Common causes: broken or damaged wiring to the sensor, left blind spot sensor malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • No left blind spot warnings
  • The security system malfunction indicator is on
  • Error message on display
  • Blind spot warning system does not work

Causes

  • Broken or damaged wiring to the sensor
  • Left blind spot sensor malfunction
  • Problems with the system control unit
  • Contact corrosion
  • Sensor power problems

How to Fix

  1. Check the integrity of the wiring to the sensor
  2. Check the connections and contacts of the sensor
  3. Check the power supply and ground of the sensor
  4. Replace a faulty blind spot sensor
  5. Repair only from an authorized dealer

Related codes

U11FAU11FCU11FD

FAQ

What does the U11FB code mean?

U11FB is an OBD-II diagnostic trouble code that indicates: Lost Communication With Left Blind Spot Sensor

What causes a U11FB error code?

The most common causes of U11FB include: Broken or damaged wiring to the sensor; Left blind spot sensor malfunction; Problems with the system control unit; Contact corrosion.

How do I fix a U11FB diagnostic trouble code?

To fix U11FB: Check the integrity of the wiring to the sensor. Check the connections and contacts of the sensor. Check the power supply and ground of the sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U11FB?

Limited driving only, diagnose soon

How much does it cost to fix U11FB?

The estimated repair cost for U11FB is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat