What Does B2357 Mean?
This code indicates the Body Control Module (BCM) has detected abnormally low current flow in the driver's side window motor circuit during a downward operation command. The BCM monitors current draw to verify proper motor operation and detect faults. A low current sense reading suggests high resistance, an open circuit, or lack of proper electrical load in the window down motor circuit.
Common Causes
35%
Faulty or worn driver window motor with open windings or internal failure in the down direction circuit
30%
Damaged or corroded wiring harness between BCM and window motor, including broken wires or poor connections at connectors
20%
Faulty window regulator causing binding or mechanical resistance preventing motor operation
10%
Failed body control module with internal current sensing circuit malfunction
5%
Blown fuse or faulty relay in the window motor power distribution circuit
Diagnostic Steps
1
Step 1: Perform a visual inspection of the driver door wiring harness, particularly at the door hinge area where flexing occurs. Check for broken, chafed, or corroded wires. Inspect all connectors for corrosion, pushed-back pins, or damage.
2
Step 2: Using a digital multimeter, check for continuity on the window motor down circuit from the BCM connector to the window motor connector with the harness disconnected at both ends. Resistance should be less than 1 ohm. Also check for shorts to ground or power.
3
Step 3: Test the window motor directly by applying 12V battery power to the motor terminals in the down direction (with regulator disconnected if possible). Measure current draw with an ammeter - typical draw is 3-8 amps depending on vehicle. No or low current indicates motor failure.
4
Step 4: Manually operate the window regulator mechanism by hand to check for binding, obstruction, or mechanical failure. The window should move smoothly without excessive resistance throughout its full travel range.
5
Step 5: Check power and ground supply to the window motor during operation using a multimeter. Verify battery voltage at the motor power wire and solid ground (less than 0.1V) at ground wire when switch is activated in down position.
6
Step 6: After repairs, clear codes and perform functional test of window operation in both directions. Monitor current sense data with scan tool during operation to verify BCM sees proper current draw (typically 3-8 amps during movement).
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected abnormally low current flow in the driver's side window motor circuit during a downward operation command. The BCM monitors current draw to verify proper motor operation and detect faults. A low current sense reading suggests high resist...
The most common cause of B2357 (Driver Window Down Current Sense Low Circuit Failure) is: Faulty or worn driver window motor with open windings or internal failure in the down direction circuit
Typical repair costs for B2357 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects driver window convenience function. Repair at earliest convenience to restore full window operation and prevent potential security or weather protection concerns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2357 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Convenience Systems
Difficulty
Type
Generic (SAE)
Recommended Tools
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