B3924

Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–278 (est.)

Symptoms

Airbag light is on
Restraint systems can be deactivated
The error may appear after an accident or repair.

Causes

Damage to the harness for the passive restraint system
SDM module failure
Software error in SDM or ECU
Incompatibility of components after repair
Problems with module power supply

How to Fix

Check diagnostic codes in other modules
Inspect the restraint system wiring harness for damage.
Check the power and ground of the SDM module
Read SDM module ID and compare with expected value
If necessary, reflash or replace the SDM module
Clear error codes and perform system test

Related codes

B0010 B0020 U0121 U0155