P0365: Camshaft Position Sensor B Circuit (Bank 1)

What it means

A general electrical fault on camshaft position sensor B (typically the exhaust cam) on bank 1 — open, shorted, or out of plausibility. Required for variable valve timing on the exhaust cam.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

Camshaft Position Sensor B monitors the position of the B camshaft on bank 1, commonly the exhaust cam, so the control module can compare cam position with crankshaft position and manage valve timing. This code sets when the bank 1 Sensor B circuit has an electrical or plausibility fault, which can disrupt exhaust-cam timing control.

Common causes

Most likely first.

1. Camshaft position sensor B failure
2. Damaged, loose, or corroded sensor wiring or connector
3. Camshaft timing or reluctor issue

Symptoms

• Check engine light on
• Power loss especially in mid-rpm range
• Possible rough idle or stalling
• Increased fuel consumption

How to diagnose it

1. Save freeze-frame data and check live camshaft position and synchronization data for Sensor B on bank 1, along with related timing or sensor codes.
2. Locate bank 1 and its Sensor B using vehicle-specific service information, then inspect that sensor's connector and wiring for oil, corrosion, looseness, or damage.
3. Check the Sensor B circuit's power, ground, and signal against the wiring diagram and manufacturer's specification.
4. If the circuit checks pass, compare the commanded and reported bank 1 exhaust-cam position and inspect the sensor signal while cranking or running as specified.
5. If the signal and wiring are sound, investigate the bank 1 Sensor B reluctor, cam timing, and variable valve timing mechanism using the manufacturer's procedure.

Common fixes

• Repair damaged or loose wiring and connector terminals at bank 1 Camshaft Position Sensor B.
• Clean and secure the Sensor B connector and restore its seal if moisture or oil has entered.
• Replace bank 1 Camshaft Position Sensor B if it fails the manufacturer's electrical or signal test.
• Correct a confirmed reluctor, cam-timing, or variable valve timing fault affecting the bank 1 B camshaft.

Can I keep driving?

If the engine stalls, runs very roughly, or loses power, avoid driving in traffic and stop safely; cam timing faults can worsen and may prevent restarting. If it runs normally with a steady light, limit driving and arrange diagnosis soon.