Body Control Module Internal Fault
What does B1413 mean?
The B1413 code means the vehicle's onboard diagnostic system has detected: Body Control Module Internal Fault. This is a moderate severity code.
Common Symptoms
- Multiple body electrical systems malfunctioning
- Intermittent lighting and accessory failures
- Warning lights on for multiple unrelated systems
- Power locks and windows erratic
- Key fob and security system issues
Probable Causes (Ranked by Likelihood)
- Body control module internal circuit failure Very High
- Water damage to BCM from leak High
- BCM power supply or ground fault Moderate
- Corrupted BCM software Low
Step-by-Step Diagnostic Procedure
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Scan BCM for all stored and pending DTCs
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Check BCM power supply and ground connections
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Inspect BCM location for signs of water damage or corrosion
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Attempt BCM software update or reflash
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Test BCM inputs and outputs with scan tool bidirectional controls
Frequently Asked Questions
What is the body control module?
The BCM is the central computer that controls most body electrical functions including interior and exterior lighting, power windows, door locks, wipers, and security systems.
Can a BCM be repaired or does it need to be replaced?
Some BCM failures can be fixed with a software update. If the internal hardware has failed or water damage has occurred, replacement is usually necessary. New BCMs require programming.
Where is the BCM typically located?
The BCM is commonly found under the dashboard, behind the kick panel, or in the junction box area. Unfortunately, some locations are prone to water intrusion from leaking windshields or AC drains.