B0048 – Right Front Side Impact Sensor Circuit Low
DTC B0048 indicates that the Airbag Control Module (ACM) has detected a low voltage condition in the right front side impact sensor circuit. The sensor provides collision data to the Supplemental Restraint System (SRS) module to help determine airbag deployment decisions.
A low circuit condition means the sensor signal voltage is below the expected operating range, which may prevent accurate crash detection.
Code Information
- DTC: B0048
- System: Supplemental Restraint System (SRS)
- Description: Right Front Side Impact Sensor Circuit Low
- Severity: High (Safety Related)
Symptoms
- Airbag warning light ON.
- SRS warning message displayed.
- Right side airbag system may be disabled.
- B0048 stored in the SRS control module.
Possible Causes
- Short circuit to ground in sensor signal wiring.
- Damaged right front impact sensor.
- Corroded or damaged connector.
- Low sensor reference voltage.
- Damaged wiring harness.
- Airbag Control Module fault (rare).
Typical Wiring Diagram
Diagnostic Procedure
- Confirm B0048 using an SRS-capable scan tool.
- Check for additional airbag-related codes.
- Inspect the right front impact sensor connector.
- Check wiring for short circuits, corrosion, or damage.
- Compare sensor readings with manufacturer specifications.
- Repair wiring or replace the sensor if necessary.
- Clear codes and confirm the repair.
Live Data Diagnosis (Advanced Scan Tool)
Advanced scan tools can monitor SRS live data to determine whether the fault is caused by the sensor, wiring, or Airbag Control Module.
How to Access Live Data
- Connect the scan tool to the DLC connector.
- Select vehicle information.
- Enter:
System → SRS Airbag → Data Stream / Live Data
Recommended Parameters
- Right Front Impact Sensor Status.
- Sensor Communication Status.
- Sensor Voltage.
- Battery Voltage.
- Crash Sensor Identification.
- Stored Freeze Frame Data.
Diagnosis Using Live Data
- No Communication: Check wiring and connector.
- Low Voltage Reading: Check for short to ground.
- Normal Data But Code Returns: Suspect sensor or module.
- Intermittent Changes: Inspect wiring movement and connector condition.
Important Note
Wire colors, connector pinouts, sensor location, and electrical specifications vary between vehicle manufacturers and models. Always refer to factory service information before testing SRS circuits.
Can You Drive With B0048?
The vehicle may operate normally, but the SRS system may not provide full protection during a collision. Repair this fault as soon as possible.
Estimated Repair Cost
- Connector repair: $20–80
- Wiring repair: $40–150
- Impact sensor replacement: $80–300
- SRS module repair/replacement: $300–900
Related DTCs
Frequently Asked Questions
What causes B0048?
Common causes include shorted wiring, connector problems, or a faulty impact sensor.
Can a scanner diagnose B0048?
Yes. Advanced scanners can display SRS live data and communication status.
Should the sensor be replaced immediately?
No. Diagnose wiring and live data first before replacing components.
OBDSpark Technician Tip: Never use a test light or external voltage on SRS circuits. Follow manufacturer safety procedures before servicing airbags.