B3857

Incorrect Rollover Sensor Installed

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

The security system malfunction indicator is on
Error B3857 in diagnostic scanner memory
Possible malfunction of airbags

Causes

Incorrect rollover sensor installed
Incompatibility of the sensor with the vehicle system
Damage to the sensor wiring harness
Software error in the passive safety module

How to Fix

Check that the rollover sensor meets vehicle specifications
Replace the sensor with an original or compatible analogue
Check the integrity of the wiring harness and contacts
Reset the error and check the system
If necessary, reflash the passive safety module

Related codes

B0001 B0020 B0051