B1942 — Air Bag Crash Sensor #2 Feed/Return Circuit Open

B1942 — Air Bag Crash Sensor #2 Feed/Return Circuit Open. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: damaged wiring under seats or in the steering column, faulty impact or occupancy sensor, depleted backup battery or low system voltage.

body electrical

Is it safe to drive?

Drive with caution The car drives normally, but with the SRS light on the airbags may not deploy in a crash. Treat it as a safety-critical repair: fine to drive to the shop, not fine to ignore for months.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm B1942 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many B0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the airbag / restraint system (SRS) for damage, corrosion, chafing or poor contact.
Subsystem check Do a continuity test end-to-end on the air bag crash sensor #2 feed/return circuit and wiggle the harness while measuring — intermittent opens show up as fluctuating readings.
Subsystem check Read the SRS module with a scanner that supports airbag systems — generic OBD2 readers cannot see these codes.
Subsystem check Inspect under-seat connectors — they are often disturbed by seat movement or cleaning.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1942 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1942 (parts and labor, USD, independent shop rates): SRS module reset or replacement: $300–$1,000; Reconnect or repair SRS wiring/connectors: $80–$250; Replace a sensor or clockspring: $150–$500. Overall, fixing B1942 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Is it safe to drive with B1942?

The car drives normally, but with the SRS light on the airbags may not deploy in a crash. Treat it as a safety-critical repair: fine to drive to the shop, not fine to ignore for months.

How much does it cost to fix B1942?

SRS module reset or replacement — $300–$1,000; Reconnect or repair SRS wiring/connectors — $80–$250; Replace a sensor or clockspring — $150–$500. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

How do I diagnose B1942 myself?

Start with a scan: confirm B1942, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the air bag crash sensor #2 feed/return, and verify the suspect component against live data before buying parts.

What are the symptoms of B1942?

Drivers most often notice: airbag system disabled message, no other driving symptoms, airbag (SRS) warning light on.

What is the most common cause of B1942?

The most common causes are: damaged wiring under seats or in the steering column, faulty impact or occupancy sensor, depleted backup battery or low system voltage.

When your vehicle's onboard diagnostics detect a problem with the supplemental restraint system, it logs a specific fault code to help pinpoint the issue. Code B1942 refers to "Air Bag Crash Sensor #2 Feed/Return Circuit Open," which falls under the body electrical category. This code appears when the air bag control module can no longer detect a complete electrical path through crash sensor number two's feed and return circuits. The module expects to see current flowing through this circuit; when it detects an open instead, it sets B1942 and illuminates the air bag warning light.

The supplemental restraint system relies on multiple crash sensors positioned throughout the vehicle to detect impact severity and signal the air bag control module when deployment is warranted. Crash sensor number two communicates with the module through dedicated wiring that carries both power feed and ground return signals. If this circuit becomes interrupted anywhere between the sensor and the control module, the module registers the condition as an open circuit and sets B1942. Common culprits include damaged wiring, faulty connectors, blown fuses, or an internally failed sensor. The module typically requires multiple drive cycles to confirm the fault before permanently storing the code, which helps distinguish genuine failures from temporary electrical glitches.

Symptoms of B1942

When B1942 is active, you'll generally notice one or more of these indicators:

Airbag system disabled message displayed in the instrument cluster
Airbag or SRS warning light remains illuminated on the dashboard
No noticeable changes to engine performance, braking, or steering
Possible intermittent warning light behavior depending on whether the fault is constant or triggered by specific conditions

Common Causes

The most frequent reasons for B1942 to appear, listed from most to least likely:

Corroded, backed-out, or unplugged electrical connectors at the crash sensor or control module
Broken or chafed wiring in the air bag crash sensor number two circuit harness
Internally failed air bag crash sensor number two (open circuit within the sensor itself)
Blown fuse protecting the SRS circuit
Wiring damage in high-movement areas such as under seats or within the steering column
Failed clockspring affecting the driver-side air bag circuit
Depleted backup battery or insufficient system voltage preventing proper module operation
Faulty SRS control module or unresolved crash data stored in module memory

Diagnostic Procedure

Follow these steps to isolate the root cause of B1942:

Connect a compatible OBD2 scanner and retrieve all stored codes, paying special attention to freeze frame data captured when the fault first appeared. This snapshot records engine speed, load, coolant temperature, and vehicle speed at the moment of failure, which helps recreate the conditions that triggered the code.
Check for any related air bag or restraint system codes. Multiple codes often point toward a single root cause, such as a shared power supply or ground issue.
Perform a thorough visual inspection of the SRS wiring harness and connectors, looking for damaged insulation, bent pins, corrosion buildup, or loose connections. Pay particular attention to connectors under the seats and near the steering column where movement and cleaning can cause disturbance.
Test circuit continuity end-to-end on the crash sensor number two feed and return circuit using a multimeter. Gently wiggle the harness during testing to expose intermittent opens that might not show up during static measurement.
Use a manufacturer-specific scanner or SRS diagnostic tool to access air bag module data beyond what standard OBD2 readers provide. Generic scanners typically cannot read supplemental restraint system codes or perform module-specific tests.
After identifying and repairing the underlying issue, clear the codes and complete a full drive cycle under conditions similar to those recorded in the freeze frame. Confirm that B1942 does not reappear before considering the repair complete.

Repair Options and Costs

Repair expenses vary significantly depending on which component is actually at fault. The following ranges reflect typical parts and labor costs at independent repair shops in the United States:

Reconnect or repair SRS wiring and connectors: $80–$250
Replace air bag crash sensor number two: $150–$500
Replace faulty clockspring: $150–$500
SRS control module reset or replacement: $300–$1,000

Always address the cheapest and most probable causes first—wiring issues and connector problems—before considering expensive component replacements.

Total Repair Cost Summary

Fixing B1942 typically costs between $80 and $1,000 depending on the root cause. A proper diagnosis before purchasing parts prevents unnecessary expenses, since the most expensive scenarios involving module replacement are rarely the actual problem. Labor rates vary by region, but most shops charge between $75 and $150 per hour for SRS work.

Driving Safety Verdict

Your vehicle will operate normally with B1942 stored, but the air bag system may not deploy in a collision if the fault remains unresolved. Treat this as a safety-critical issue—driving to a repair facility is acceptable, but leaving the problem unaddressed for months significantly increases risk to you and your passengers. Schedule diagnostic testing and repair promptly.