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OBD Code P0393

Camshaft Position Sensor B Circuit High Input Bank 2

CodeP0393
DescriptionCamshaft Position Sensor B Circuit High Input Bank 2
Possible CausesShort to voltage|Faulty sensor
SymptomsNo start|Check engine light
SystemIgnition

What Does P0393 Mean?

Camshaft Position Sensor B Circuit High Input Bank 2. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the ignition.

Code Breakdown

P = Powertrain code

0 = Generic (SAE standard)

How to Fix P0393

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Inspect the camshaft position sensor connector for corrosion or damage.
  2. Check the sensor wiring for breaks, shorts, or chafing.
  3. Test the sensor with a multimeter — check resistance and compare to spec.
  4. Inspect the sensor reluctor ring/wheel on the camshaft for damage or missing teeth.
  5. Check the air gap between the sensor and reluctor ring.
  6. Replace the camshaft position sensor if tests indicate failure.
  7. Clear codes and verify proper signal with a scan tool or oscilloscope.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P0393 serious?

Yes — P0393 is considered a high-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear P0393 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P0393?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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