AutoCodes – Generic – B1909

B1909 Code - Air Bag Crash Sensor 2 Ground Circuit Short To Ground

Quick Answer

The Air Bag Control Module monitors the Air Bag Crash Sensor 2. Common causes include Faulty Air Bag Crash Sensor 2, Air Bag Crash Sensor 2 harness is open or shorted, Air Bag Crash Sensor 2 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1909 indicates Air Bag Crash Sensor 2 Ground Circuit Short To Ground.
Common causes: Common causes include Faulty Air Bag Crash Sensor 2, Air Bag Crash Sensor 2 harness is open or shorted, Air Bag Crash Sensor 2 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,021

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 27, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code B1909 Description

The Air Bag Control Module monitors the Air Bag Crash Sensor 2. The Air Bag Control Module sets the OBDII code when the Air Bag Crash Sensor 2 is not to factory specifications.

OBDII Code B1909 - Air Bag Crash Sensor 2 Ground Circuit Short To Ground - AutoCodes.com — B1909 Code - Air Bag Crash Sensor 2 Ground Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B1909?

Faulty Air Bag Crash Sensor 2
Air Bag Crash Sensor 2 harness is open or shorted
Air Bag Crash Sensor 2 circuit poor electrical connection
Faulty Air Bag Control Module

How to Fix the DTC B1909?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1909 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1909 code?

Need more information on how to fix the B1909 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1909 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1909 Hyundai — Rear Sensor Signal Fault
B1909 KIA — Rear Sensor Signal Fault

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.