B3820
Left Rear Window Down Control Circuit
B3820 is an OBD-II diagnostic trouble code meaning: Left Rear Window Down Control Circuit. Common causes: open or short circuit in wiring harness, window lift motor malfunction. Estimated repair cost: $56–167.
Symptoms
- The left rear window does not go down
- Intermittent operation of the window regulator
- The malfunction indicator on the instrument panel lights up
Causes
- Open or short circuit in wiring harness
- Window lift motor malfunction
- Problems in the power window control unit
- Contact corrosion
- Mechanical obstacles in the window lift mechanism
How to Fix
- Check the wiring harness for breaks and short circuits
- Check the window lift motor
- Inspect contacts for corrosion
- Check the window lift mechanism for mechanical obstructions.
- If necessary, replace faulty components
Related codes
Error B3820 by Vehicle Brand
FAQ
What does the B3820 code mean?
B3820 is an OBD-II diagnostic trouble code that indicates: Left Rear Window Down Control Circuit
What causes a B3820 error code?
The most common causes of B3820 include: Open or short circuit in wiring harness; Window lift motor malfunction; Problems in the power window control unit; Contact corrosion.
How do I fix a B3820 diagnostic trouble code?
To fix B3820: Check the wiring harness for breaks and short circuits. Check the window lift motor. Inspect contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B3820?
Limited driving only, diagnose soon
How much does it cost to fix B3820?
The estimated repair cost for B3820 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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