OBD Code B2357: Driver Window Down Current Sense Low Circuit Failure

Q: What does OBD code B2357 mean?

Driver Window Down Current Sense Low Circuit Failure. The car's computer detected weak electrical current flowing through the driver's window down circuit, like a dimming light bulb indicating a broken wire or bad connection. The system expects a certain amount of power when commanding the window down, but it's receiving less than normal.

Q: What are the symptoms of fault code B2357?

Driver window fails to operate or moves very slowly, Window control switch works intermittently, No response when pressing window down button

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What This Actually Means

In plain language — no jargon

The car's computer detected weak electrical current flowing through the driver's window down circuit, like a dimming light bulb indicating a broken wire or bad connection. The system expects a certain amount of power when commanding the window down, but it's receiving less than normal.

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Symptoms You May Notice

3 known symptoms for this code

Driver window fails to operate or moves very slowly

Window control switch works intermittently

No response when pressing window down button

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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the current draw when the driver window motor is commanded downward. It compares the measured current against expected thresholds to detect open circuits, high resistance, or motor failures. If current falls below the minimum threshold, the fault is triggered.

Voltage & Parameter Thresholds

Parameter	Normal Range	Fault Condition
Window Motor Current Draw	3-8 amps during operation	Below 2 amps or no current detected
Circuit Voltage	12-14.5V	Below 10V or intermittent

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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex

1

Battery terminals and connections

Clean corrosion from battery terminals and ground connections to ensure proper current flow to the window circuit.

2

Door wiring harness and connectors

Inspect the rubber boot and connectors where the door wiring plugs into the vehicle frame for loose pins or corrosion.

3

Window motor and regulator assembly

Test motor resistance with a multimeter; if resistance is extremely high or infinite, the motor or internal connections have failed and require replacement.

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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B2357 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.

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How to Clear Code B2357

What happens after you fix the fault

Once the fault is repaired, B2357 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When

Fault has been diagnosed and repaired
You want to confirm the repair worked
Code appeared after a sensor was cleaned

⚠️ Do Not Clear When

Preparing for an emissions/PUC test
Root cause is still undiagnosed
Check engine light is flashing

Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.