B1B48

Symptoms

• The Check Engine/Service Required light on the instrument panel is on.
• No sound signal when approaching obstacles in reverse on the left
• No visual distance indicator on the parking system display in the left rear zone
• Parking assistance only works with other sensors
• When scanning, code B1B48 is detected

Causes

• Broken or damaged parking sensor harness wiring
• Corrosion of sensor connector contacts or module connector
• Disconnected or loose sensor connector
• Physical damage to the sensor itself (cracks, dents from impact)
• Contamination or icing of the sensor diaphragm (snow, dirt, ice)
• Sensor malfunction (internal sensor electronics failure)
• Malfunction of the parking system control unit
• Programming error or module configuration loss

How to Fix

1. Connect the OBD-II diagnostic scanner and read code B1B48, check related codes
2. Visually inspect the sensor and its connector for damage, corrosion, dirt or ice.
3. Clean the sensor from dirt, snow, ice using a soft cloth and water
4. Check the integrity and tightness of the sensor connector, reconnect if necessary
5. Visually check the wiring harness for breaks, fraying or oxidation of contacts
6. Use a multimeter to check continuity between the sensor and the control module
7. Measure the supply and ground voltage at the sensor connector (should be normal)
8. Replace the parking sensor with a new one if it is physically damaged or inoperable
9. Replace damaged wiring harness or repair connection
10. After replacing components, rescan and clear the error code
11. Check the functionality of the parking system when driving in reverse

Related codes

FAQ