Body code

B3A46 Code: Active Aerodynamic Feature B Position Sensor 2 Circuit High Voltage

What the code tells you

A diagnostic trouble code identifies a condition detected by a controller. It does not identify a failed part by itself; confirm the definition for the vehicle and controller involved.

Before diagnosis

Record the VIN, engine, symptoms, all stored codes and freeze-frame data before clearing faults. Follow the manufacturer’s test procedure. If there is overheating, loss of oil pressure, severe misfire or unsafe drivability, stop safely and arrange professional assistance.

Commercial-vehicle applicability

An OBD-II code is not a substitute for a heavy-duty SPN/FMI fault definition. Identify the engine and reporting controller; use the correct service information for that configuration.

B3A46 means: Active Aerodynamic Feature B Position Sensor 2 Circuit High Voltage. Active Aerodynamic Feature B Position Sensor 2 Circuit High Voltage. The signal reads higher than it should — often a wire shorted to power, an open ground, or a failing sensor.

Run a shop or repair van?

Run your next b3a46 diagnosis — active aerodynamic feature b position sensor 2 circuit high voltage job in Repairius: estimate, text approval, invoice, paid. Unlimited users.

Start free trial

14-day free trial · credit card required · cancel anytime

Fleet, dispatcher or driver?

DispatchTool keeps loads, drivers and breakdowns organized. A separate product from Repairius.

Try DispatchTool

Need it fixed on your car?

Find local and mobile shops and call or text them directly.

Find a shop

Need B3A46 diagnosed?

Send one request and nearby shops can quote the repair.

Related B-series codes

B1318

Battery Voltage Low at Module

B2477

Module Configuration Failure

B1000

ECU Malfunction

B1500

Brake Switch Circuit Failure

B1676

Battery Pack Voltage Out of Range

B2229

Ambient Light Sensor Circuit

B2580

Driver Frontal Stage 1 Deployment Control

Parts, tools, and pros for this code

diagnostic

passenger

Parts pros use for this job

•Oxygen sensor
•Spark plugs
•MAF sensor

Tools pros use

•OBD-II scanner
•Code reader
•Smoke leak tester

Scan your own codes

A basic OBD-II scanner pays for itself the first time you avoid a diagnostic fee.

•Bluetooth scanners for any phone
•Live data & freeze frame
•Reset check engine light

Prefer a professional?

Find local and mobile shops and call or text them directly.

✓Call or text shops directly
✓Verified reviews & ratings
✓See services offered

Doing it yourself? Shop our partners

PartsGeek — Discount OE & aftermarket parts — up to 80% off dealer prices.Amazon Automotive — Wide selection of parts, tools, and OBD scanners.

We may earn a small commission from partner links — it never changes the price you pay.

Code meanings can vary by engine and controller; confirm the cause before replacing parts.