B3A4E

Q: Will B3A4E clear itself?

B3A4E is unlikely to clear itself permanently. Even if the check engine light turns off temporarily, the underlying issue typically remains and the code will return. Proper diagnosis and repair are recommended.

Low Severity (Level 2)

Active Aerodynamic Feature C Position Sensor 1 Circuit High Voltage

B3A4E usually means active Aerodynamic Feature C Position Sensor 1 Circuit High Voltage.

Can you still drive with B3A4E?

⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.

Typical repair cost: $50 – $600

Severity Level 2 — 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

Body accessories reading abnormally high or staying at maximum
Engine may run rich or have poor fuel economy (PCM sees faulty signal)
Diagnostic trouble code (DTC) stored in module memory
Fault may be intermittent — code may clear itself and reappear
Reduced vehicle functionality related to the body accessory system

Possible Causes

Failed body control module or accessory module — internal short causing abnormally high voltage signal to the control module
Wiring shorted to a 5V reference or 12V power wire in the same harness — wires melted together or chafing at a common point
Poor ground connection for the body accessory system — high resistance in ground path causes voltage to read high
Faulty voltage regulator or power supply within the module

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 ($37-100 at shop, free at auto parts store for basic scan)
Visually inspect the body accessory system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $54 diagnostic fee at shop)
Test body control module or accessory module with a multimeter at the connector — compare readings to factory service manual specs. If out of spec, replace body control module or accessory module ($50-600)
Check the reference voltage supply to body control module or accessory module — should be steady 5V (or 12V) — if low, trace back to PCM/BCM voltage regulator ($148-698 if module repair needed)
Perform a voltage drop test on the ground side of the body accessory system circuit — more than 0.1V drop means a bad ground that must be cleaned/repaired ($82-184 at shop)

Estimated Repair Cost

$50 – $600(typical range; varies by vehicle make and model)

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 B3A4E mean?

B3A4E stands for "Active Aerodynamic Feature C Position Sensor 1 Circuit High Voltage". B3A4E usually means active Aerodynamic Feature C Position Sensor 1 Circuit High Voltage.

Can you drive with B3A4E?

Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.

How much does it cost to fix B3A4E?

Repair costs for B3A4E typically range from $50 to $600, 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 ($37-100 at shop, free at auto parts store for basic scan); Visually inspect the body accessory system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $54 diagnostic fee at shop); Test body control module or accessory module with a multimeter at the connector — compare readings to factory service manual specs. If out of spec, replace body control module or accessory module ($50-600).

Will B3A4E clear itself?

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Related OBD-II Codes

These codes are in the same range as B3A4E and often share similar causes and fixes.

B0001— Driver Frontal Stage 1 Deployment Control B0002— Driver Frontal Stage 2 Deployment Control B0003— Driver Frontal Stage 3 Deployment Control B0004— Driver Knee Bolster Deployment Control B0005— Collapsible Steering Column Deployment Control

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