Faulty driver's window switch; Damaged wiring or connector in the driver's door harness; Failed window motor; Blown fuse or faulty relay in the window circuit; Binding or mechanical obstruction in the window regulator; Corrosion or water intrusion in the door connector; BCM internal fault (rare)

DTC codes / B02xx · Airbags, seats, doors, lights and comfort systems / B0252

B0252Driver Window Motor Down Circuit

Q: What does code B0252 mean?

Driver Window Motor Down Circuit. B0252 indicates that the body control module (BCM) has detected an abnormal condition in the driver's window motor down circuit, typically an open, short to ground, or excessive current draw when commanding the window down. The BCM monitors the circuit and sets this code when the expected voltage or current feedback does not match the command.

B0252 indicates that the body control module (BCM) has detected an abnormal condition in the driver's window motor down circuit, typically an open, short to ground, or excessive current draw when commanding the window down. The BCM monitors the circuit and sets this code when the expected voltage or current feedback does not match the command.

SystemBody

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

Driver's window does not move down when the switch is pressed
Window moves down slowly or intermittently
Window may go down but not up, or vice versa
Clicking or grinding noise from the door when operating the window
Often no symptoms besides the warning light if the fault is intermittent

Common causes, most likely first

Faulty driver's window switch
Damaged wiring or connector in the driver's door harness
Failed window motor
Blown fuse or faulty relay in the window circuit
Binding or mechanical obstruction in the window regulator
Corrosion or water intrusion in the door connector
BCM internal fault (rare)

How to diagnose and fix it

Check the fuse and relay for the driver's window circuit
Inspect the driver's door wiring harness for chafing or broken wires
Test the window switch for continuity and proper operation
Measure voltage and ground at the window motor connector while operating the switch
Apply direct power to the window motor to verify operation
Inspect the window regulator and tracks for binding or debris
If all components test good, diagnose the BCM and its connections

Common misdiagnosis traps for B0252

A binding window regulator can cause excessive current draw that mimics a faulty motor, so always check for mechanical smoothness before replacing electrical parts.
The driver's window motor often shares a ground with other door components; a poor ground can set this code without any motor fault.
Intermittent faults are frequently caused by a broken wire inside the flexible rubber boot between the door and body, which can be missed during a visual inspection.
Some vehicles use a smart motor with integrated electronics; testing with a standard test light can damage the module, so use a digital multimeter.
The BCM may set B0252 if the window switch is held down for an extended period, so check for a stuck switch or aftermarket accessories wired into the circuit.

Can I keep driving with B0252?

You can generally drive the vehicle, but the driver's window may not operate, which could affect visibility and security. Avoid driving in rain or leaving the vehicle parked with the window down until repaired.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.