What Does B1906 Mean?
This code indicates the airbag control module has detected a short to ground condition in the power supply (feed) or return circuit for crash sensor #2. The module continuously monitors circuit resistance and voltage levels, and when the feed or return wire makes unintended contact with vehicle ground, it triggers this fault. This compromises the airbag system's ability to detect collision events from this specific sensor location.
Safety Warning
Vehicle should not be driven as the airbag system is compromised and may not deploy properly in a collision, or could fail to deploy entirely from sensor #2 detection zone. This represents a serious safety hazard to vehicle occupants and repair should be completed immediately.
Common Causes
45%
Damaged or chafed wiring harness with insulation worn through, causing wire contact with chassis ground, commonly at pinch points or near mounting brackets
25%
Corroded or moisture-damaged crash sensor connector terminals creating a ground path through corrosion buildup
20%
Failed crash sensor #2 with internal short to ground condition within the sensor housing
10%
Improper repair or installation causing wiring to contact ground, or incorrect sensor mounting creating ground fault
Diagnostic Steps
1
Step 1: Perform thorough visual inspection of crash sensor #2 wiring harness from sensor to airbag control module, checking for pinched, chafed, or damaged wires at frame rails, body seams, and routing points. Pay special attention to areas where harness passes through grommets or near sharp metal edges
2
Step 2: Disconnect crash sensor #2 connector at the sensor. Using a digital multimeter, measure resistance from both sensor feed and return pins (harness side) to known good chassis ground. Reading should be infinite (open circuit). Less than 10k ohms indicates short to ground in harness
3
Step 3: If harness tests good, measure resistance across crash sensor #2 terminals (sensor side) to sensor mounting point/ground. Should read infinite resistance. Low resistance indicates internal sensor short to ground requiring sensor replacement
4
Step 4: Inspect sensor connector for corrosion, moisture intrusion, pushed-back pins, or damaged seals. Clean connector terminals with electrical contact cleaner and inspect for proper terminal retention. Check sensor mounting location for damage or improper grounding
5
Step 5: If wiring fault found, repair harness using OEM-approved splice methods with heat-shrink solder connections and proper shielding. Re-route harness away from sharp edges and secure with proper clips. If sensor failed, replace with OEM-specification crash sensor
6
Step 6: Clear codes, perform airbag system initialization procedure per manufacturer specifications, and road test vehicle. Verify code does not return and airbag warning light remains off
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the airbag control module has detected a short to ground condition in the power supply (feed) or return circuit for crash sensor #2. The module continuously monitors circuit resistance and voltage levels, and when the feed or return wire makes unintended contact with vehicle grou...
The most common cause of B1906 (Air Bag Crash Sensor #2 Feed/Return Circuit Short To Ground) is: Damaged or chafed wiring harness with insulation worn through, causing wire contact with chassis ground, commonly at pinch points or near mounting brackets
Typical repair costs for B1906 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle should not be driven as the airbag system is compromised and may not deploy properly in a collision, or could fail to deploy entirely from sensor #2 detection zone. This represents a serious safety hazard to vehicle occupants and repair should be completed immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1906 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Body
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
