B1402
Low Severity (Level 1)Driver Power Window Down Switch Circuit Failure
B1402 usually means driver Power Window Down Switch Circuit Failure.
Can you still drive with B1402?
✅Safe to drive — this is an informational or minor issue. Schedule diagnosis at your convenience.
Typical repair cost: $100 – $500
Severity Level 1 — Low
This code indicates a minor issue that is unlikely to cause immediate driveability problems. You can typically continue driving but should have the vehicle inspected at your earliest convenience.
Common Symptoms
- Window moves slowly or only works from one switch
- Warning light or message on dashboard related to the power window system
- Power window won't go up or down — stuck in current position
- Diagnostic trouble code (DTC) stored in module memory
Possible Causes
- Failed window motor/regulator — internal fault from age, heat cycling, and vibration
- Damaged wiring or corroded connector in the power window system circuit
- Blown fuse for the power window system circuit — check before replacing components
- Faulty control module driving the window motor/regulator
- Loose or corroded ground point shared by the power window system
- Window regulator mechanical failure — cable snapped or pulley broken, motor runs but glass doesn't move
Common Fixes
- Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($18-139 at shop, free at auto parts store for basic scan)
- Visually inspect the power window system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $70 diagnostic fee at shop)
- Inspect the wiring boot where it passes from the body into the door — this is the #1 failure point. Peel back the rubber boot and check for broken/cracked wires ($0 DIY inspection)
- Replace window motor/regulator if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($100-500)
- Check and replace any blown fuses in the power window system fuse circuit — if fuse blows again, there's still a short that needs to be found ($2-20 for fuses)
Estimated Repair Cost
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Frequently Asked Questions
What does B1402 mean?
B1402 stands for "Driver Power Window Down Switch Circuit Failure". B1402 usually means driver Power Window Down Switch Circuit Failure.
Can you drive with B1402?
Safe to drive — this is an informational or minor issue. Schedule diagnosis at your convenience.
How much does it cost to fix B1402?
Repair costs for B1402 typically range from $100 to $500, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($18-139 at shop, free at auto parts store for basic scan); Visually inspect the power window system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $70 diagnostic fee at shop); Inspect the wiring boot where it passes from the body into the door — this is the #1 failure point. Peel back the rubber boot and check for broken/cracked wires ($0 DIY inspection).
Will B1402 clear itself?
Related Repair Costs
Explore Repair Costs
Related OBD-II Codes
These codes are in the same range as B1402 and often share similar causes and fixes.
Worried about repair costs?
Get transparent estimates and verify your mechanic's quote before authorizing repairs.
Related Discussions
See what other car owners are saying about this code and related repairs.
View B1402 discussions in the community