Hood Ajar Switch Circuit Malfunction
What does B1016 mean?
The B1016 code means the vehicle's onboard diagnostic system has detected: Hood Ajar Switch Circuit Malfunction. This is a low severity code.
Common Symptoms
- Hood ajar warning on dashboard
- Security system will not arm due to hood status
- Remote start refuses to engage
- Hood indicator shows open when hood is closed
- Under-hood light stays on
Probable Causes (Ranked by Likelihood)
- Failed hood ajar switch Very High
- Corroded or damaged hood switch connector High
- Hood latch not fully engaging Moderate
- Wiring fault at hood switch Low
Step-by-Step Diagnostic Procedure
-
Locate and test hood ajar switch
-
Check hood latch for full engagement
-
Inspect switch connector for corrosion
-
Verify BCM reads correct hood status with scan tool
-
Check wiring from hood switch to BCM
Frequently Asked Questions
Where is the hood ajar switch?
The hood ajar switch is usually a small pin-type switch located near the hood latch at the front of the engine bay. When the hood closes, it depresses the switch to signal the BCM.
Can I bypass the hood switch to use remote start?
It is not recommended. The hood switch is a safety feature that prevents remote start when the hood is open to protect anyone working in the engine bay. Bypassing it creates a safety risk.
Why is the hood switch important for the alarm system?
The alarm system monitors the hood switch to detect unauthorized access to the engine bay. If the switch is faulty, the alarm may not arm properly or may trigger false alarms.