P0394

Camshaft Position Sensor B Circuit Intermittent Bank 2

Q: Is it safe to drive with P0394?

Use caution. An intermittent cam signal can cause sudden stalling or a no-start at the worst time. Diagnose it before depending on the vehicle.

Q: Can I just clear P0394?

It returns the next time the signal drops out. Because the fault is intermittent, focus on wiring and connectors, repair the cause, then clear and re-test.

Ignition / cam & crank Generic OBD-II High

What it means

P0394 means the second camshaft position sensor on bank 2 is dropping out intermittently. The ECM uses cam position to time fuel and spark, so a signal that comes and goes — usually from chafed wiring, a loose connector, or a marginal sensor — can cause occasional stalling, hard starting, and rough running that's hard to catch.

High

Can I keep driving? Runs normally most of the time but can stall, hesitate, or be hard to start intermittently; have the wiring and sensor checked before relying on it.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Intermittent stalling or hard starting
Occasional hesitation or rough running
Reduced power at times

Common causes

Most likely first

Intermittent fault in the camshaft position sensor 'B' (bank 2)Likely
Chafed, loose, or intermittently shorting wiring in the circuitCommon
Loose or corroded connector at the sensorCommon
Debris on the sensor tip or a damaged reluctor wheelLess often
Failed ECM (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data to capture the conditions when the fault appears.
Wiggle-test the cam sensor 'B' connector and harness while watching live data for signal dropouts.
Inspect the wiring for chafing, especially near hot or moving components.
Clean the sensor tip and check the tone wheel for damage.
Replace the sensor if the signal drops out intermittently. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0394?+

Use caution. An intermittent cam signal can cause sudden stalling or a no-start at the worst time. Diagnose it before depending on the vehicle.

Can I just clear P0394?+

It returns the next time the signal drops out. Because the fault is intermittent, focus on wiring and connectors, repair the cause, then clear and re-test.

Read & clear P0394 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX