OBD Guide
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B2055

Radar Sensor Malfunction

B2055 is an OBD-II diagnostic trouble code meaning: Radar Sensor Malfunction. Common causes: physical damage to the radar sensor (shock, deformation), the sensor lens is dirty with dirt, snow, ice or insects.. Estimated repair cost: $22–500.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–500 (est.)

Symptoms

  • The malfunction lamp on the dashboard is on
  • Disabling adaptive cruise control and collision warning systems
  • Unavailability of safety assistant features
  • Possible failures in autopilot or semi-autonomous functions
  • Security error messages appear on the display
  • No visible damage or obvious problems in driving

Causes

  • Physical damage to the radar sensor (shock, deformation)
  • The sensor lens is dirty with dirt, snow, ice or insects.
  • Violation of the integrity of the sensor wiring harness or connector
  • Oxidation or corrosion of contacts in the sensor connector
  • Loosening of the sensor fasteners or its displacement after an accident
  • The sensor's internal electronics have failed
  • Incorrect sensor calibration after body repair
  • Problems in the system control module or its data bus (CAN/LIN)
  • Malfunction of the wiring harness between the sensor and the control module
  • Problems with the sensor power supply (low voltage)

How to Fix

  1. Connect an OBD-II scanner and read the full error code B2055 with additional parameters
  2. Visually inspect the radar sensor (usually located in the front of the bumper or grille) for mechanical damage, dirt, condensation or ice crust
  3. Gently clean the sensor lens with a soft, dry cloth without using harsh chemicals
  4. Check the integrity and reliability of the sensor fastening, tighten the bolts if necessary
  5. Inspect the sensor wiring harness for damage, kinks, or insulation cracks.
  6. Disconnect the sensor connector and check the contacts for oxidation, clean if necessary with alcohol
  7. Check the sensor supply voltage (usually 12V) and the presence of a ground signal using a multimeter
  8. Diagnose the radar control module for internal errors and calibration
  9. If there is mechanical damage to the sensor, replace it with a new original or high-quality analogue
  10. After troubleshooting, relearn and calibrate the radar sensor according to the manufacturer’s procedure
  11. Erase the error from the control module memory and check that the code disappears during the next diagnostic cycle

Related codes

B2054B2056B2057P0601U0121

FAQ

What does the B2055 code mean?

B2055 is an OBD-II diagnostic trouble code that indicates: Radar Sensor Malfunction

What causes a B2055 error code?

The most common causes of B2055 include: Physical damage to the radar sensor (shock, deformation); The sensor lens is dirty with dirt, snow, ice or insects.; Violation of the integrity of the sensor wiring harness or connector; Oxidation or corrosion of contacts in the sensor connector.

How do I fix a B2055 diagnostic trouble code?

To fix B2055: Connect an OBD-II scanner and read the full error code B2055 with additional parameters. Visually inspect the radar sensor (usually located in the front of the bumper or grille) for mechanical damage, dirt, condensation or ice crust. Gently clean the sensor lens with a soft, dry cloth without using harsh chemicals. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2055?

Do not drive — repair immediately

How much does it cost to fix B2055?

The estimated repair cost for B2055 is $22–500. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat