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DTC code page

P0393: Camshaft Position Sensor B Circuit High Input (Bank 2)

Quick answer: The ECU sees the Bank 2 camshaft position sensor B circuit voltage or signal level higher than expected.

Drivers also search this fault as bank 2 cam sensor B high input, bank 2 exhaust cam sensor high voltage, bank 2 cam sensor B signal high.

Severity: high Family: powertrain Related paths: 14
Meaning

What P0393 usually means

P0393 means the Bank 2 sensor B input is biased high or otherwise outside the expected upper range. That usually points to a short-to-voltage problem, connector damage, wiring faults, or an internal sensor issue that leaves the Bank 2 exhaust-cam signal electrically implausible.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Inspect Bank 2 harness routing near heat or sharp hardware where insulation may rub through.
  • Ask whether the fault began after engine work or harness movement.
  • Compare the code with actual startup and sync behavior instead of trusting the wording alone.
Driving risk

Can you keep driving?

P0393 can create real start and drivability problems, so it should not be dismissed as a minor electrical nuisance.

High urgency: If symptoms are active, reduce driving and diagnose quickly before secondary damage builds.
Likely causes

Common causes behind this code

  • Short-to-voltage in the Bank 2 sensor B signal circuit
  • Internal sensor fault creating abnormal output
  • Connector damage, moisture, or pin spread
  • Harness damage near the cylinder head or front cover
  • Voltage reference or ground problem affecting signal interpretation

Cause phrases often tied to this code: short to voltage, sensor internal fault, connector damage, wiring fault, reference issue.

Diagnostic order

Suggested workflow

  1. Inspect the connector and harness for short-to-voltage damage.
  2. Check scan data for sync loss or abnormal Bank 2 exhaust-cam status.
  3. Verify circuit integrity for the specific sensor design used.
  4. Test the sensor if wiring checks do not reveal the cause.
  5. Confirm the fix with repeated hot and cold starts.
Avoid guesswork

Common mistakes

  • Replacing VVT parts before proving the sensor B circuit is healthy.
  • Ignoring moisture or pin damage inside the connector.
  • Calling it a bad sensor without checking for harness damage first.
Repair path

Practical fix guidance

  • Fix the circuit bias or abnormal sensor output first, then recheck for any remaining timing codes.
  • If correlation codes remain after the electrical repair, move into Bank 2 timing diagnosis instead of stopping early.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P0393

Useful when the driver knows the wording but not the exact DTC yet.

  • bank 2 cam sensor B high input
  • bank 2 exhaust cam sensor high voltage
  • bank 2 cam sensor B signal high
Related search intent

Queries this page can answer naturally

  • P0393 code meaning
  • what does P0393 mean
  • bank 2 cam sensor B high signal
  • bank 2 exhaust cam short to voltage
FAQ

Quick questions about P0393

What usually causes P0393?

High-input Bank 2 sensor B codes usually come from circuit faults, connector issues, or abnormal sensor output.

Can P0393 cause reduced power?

Yes. If the ECU loses trust in the Bank 2 exhaust-cam signal, it may use a limited strategy.

Is P0393 the same as P0390?

No. P0390 is the broad Bank 2 sensor B fault, while P0393 specifically points to a high-input condition.