Hood Ajar Switch Circuit
2005-2005 Chevrolet Impala 3.4L V6
The 2005 Chevrolet Impala is equipped with a 3.4L V6 engine. Below you'll find detailed b0123 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Malfunction in the hood ajar switch circuit used by the theft deterrent system and vehicle status monitoring.
Symptoms
- Hood ajar warning always on or off
- Theft system does not detect hood opening
- Interior lights triggered by phantom hood open
Common Causes
- Faulty hood switch
- Switch out of adjustment
- Wiring damage in engine bay
- Corroded switch from engine bay moisture
Diagnostic Steps
- Check hood switch alignment
- Test switch continuity
- Inspect wiring
- Clean or adjust switch
- Test circuit voltage at BCM
Repair Notes
Adjust or replace hood ajar switch. Protect wiring from engine bay heat and moisture.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0007Rear Left Side Airbag Deployment Circuit
- B0008Rear Right Side Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
- B0011Driver Side Airbag Deployment Circuit Open
B0123 on Other Vehicles
Chevrolet Astro
1996-1996 4.3L V6 Vortec
Chevrolet Astro
1997-1997 4.3L V6 Vortec
Chevrolet Astro
1998-1998 4.3L V6 Vortec
Chevrolet Astro
1999-1999 4.3L V6 Vortec
Chevrolet Astro
2000-2000 4.3L V6 Vortec
Chevrolet Astro
2001-2001 4.3L V6 Vortec
Chevrolet Astro
2002-2002 4.3L V6 Vortec
Chevrolet Astro
2003-2003 4.3L V6 Vortec
Common Questions
What does code B0123 mean on a 2005-2005 Chevrolet Impala?
B0123 stands for "Hood Ajar Switch Circuit". Malfunction in the hood ajar switch circuit used by the theft deterrent system and vehicle status monitoring.
What are the symptoms of B0123 on a Chevrolet Impala?
Common symptoms of B0123 include: Hood ajar warning always on or off, Theft system does not detect hood opening, Interior lights triggered by phantom hood open.
What causes B0123 on a 2005-2005 Chevrolet Impala?
Common causes of B0123 include: Faulty hood switch, Switch out of adjustment, Wiring damage in engine bay, Corroded switch from engine bay moisture.
Last updated: March 2026
View Labor Times | View Torque Specs | View Fluid Specs | View Battery Specs