B3A3C
Low Severity (Level 2)Active Aerodynamic Feature A Position Sensor 2 Circuit High Voltage
B3A3C usually means active Aerodynamic Feature A Position Sensor 2 Circuit High Voltage.
Can you still drive with B3A3C?
⚠️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 ($11-102 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, $55 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 ($199-459 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 ($95-184 at shop)
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 B3A3C mean?
B3A3C stands for "Active Aerodynamic Feature A Position Sensor 2 Circuit High Voltage". B3A3C usually means active Aerodynamic Feature A Position Sensor 2 Circuit High Voltage.
Can you drive with B3A3C?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix B3A3C?
Repair costs for B3A3C 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 ($11-102 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, $55 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 B3A3C clear itself?
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