B127B on 2024-2025 Chevrolet Trax — Rearview Camera Input Signal Circuit
1 vehicles · 1 makes
Most Reported On
B127B is an OBD-II diagnostic trouble code meaning “Rearview Camera Input Signal Circuit.” B127B is a manufacturer-specific body code that generally indicates a problem with the rearview (backup) camera input signal circuit, meaning the display/control module is not receiving a proper video signal from the camera. The result is typically a blank, distorted, or missing rear camera image. It does not affect engine performance or drivability but reduces rear visibility assistance, so caution is advised when reversing. Exact meaning can vary by maker, so confirm with vehicle-specific data. This code is most commonly reported on 2024-2025 Chevrolet Trax.
Common Causes
Diagnostic Tools
To diagnose B127B, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
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LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does B127B mean?
B127B stands for "Rearview Camera Input Signal Circuit." B127B is a manufacturer-specific body code that generally indicates a problem with the rearview (backup) camera input signal circuit, meaning the display/control module is not receiving a proper video signal from the camera. The result is typically a blank, distorted, or missing rear camera image. It does not affect engine performance or drivability but reduces rear visibility assistance, so caution is advised when reversing. Exact meaning can vary by maker, so confirm with vehicle-specific data.
What are the most common causes of B127B?
The most common causes of B127B are: Faulty rearview camera, Water intrusion or physical damage to the camera, Damaged or corroded camera wiring/connector, Open or short in the camera video signal circuit, Faulty display or infotainment/control module, Loss of power or ground to the camera. The specific cause varies by vehicle.
How much does it cost to fix B127B?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by B127B?
Au7o has documented B127B across 1 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.