B3856

Discard Rollover Sensor

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$111–333 (est.)

Symptoms

Airbag light is on
The passive safety system does not activate in the event of an accident
Error B3856 is stored in the ECU memory

Causes

Rollover sensor malfunction
Open or short circuit in the sensor wiring harness
Poor contact in the sensor connector
SRS control unit malfunction

How to Fix

Diagnostics of the passive safety system using a scanner
Checking the integrity of the sensor wiring harness
Checking the contacts in the sensor connector
Replacing the rollover sensor if necessary
Resetting the error and checking the system operation

Related codes

B3855 B3857 B0001