Body Control Module Voltage Supply Low
What does B1414 mean?
The B1414 code means the vehicle's onboard diagnostic system has detected: Body Control Module Voltage Supply Low. This is a moderate severity code.
Common Symptoms
- Multiple body electrical components acting erratically
- Dim interior and exterior lights
- Slow power window operation
- BCM related warning codes stored
- Battery warning light on
Probable Causes (Ranked by Likelihood)
- Weak or failing vehicle battery Very High
- Poor battery cable connections High
- Faulty alternator not charging sufficiently Moderate
- Excessive parasitic drain lowering voltage Moderate
- Corroded BCM power supply wire Low
Step-by-Step Diagnostic Procedure
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Test battery voltage and load test the battery
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Check battery terminal connections for corrosion
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Test alternator output voltage and charging current
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Measure voltage at BCM connector pins
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Perform parasitic drain test
Frequently Asked Questions
Can a bad battery cause multiple body codes?
Yes. Low voltage from a weak battery can cause the BCM and other modules to malfunction, setting multiple DTCs across different systems. Always check the battery first.
What voltage should the BCM see?
The BCM should see approximately 12.6 volts with the engine off and 13.5 to 14.5 volts with the engine running. Voltages below 11 volts can cause erratic module behavior.
Will these codes clear after fixing the battery?
Many low-voltage codes will clear on their own or can be cleared with a scan tool once the voltage issue is resolved. If the BCM itself was not damaged, normal operation should resume.