Can I drive with P0366?

If it runs normally, short careful trips are OK — but a degrading sensor can strand you with a no-start, so don't postpone long.

Sensor A vs Sensor B?

On most Bank 1 twin-cam engines, A is the intake cam sensor and B the exhaust cam sensor. P0366 concerns B.

Could it be the timing chain?

Yes, on high-mileage engines — but only after ruling out the sensor, connector oil and wiring. Correlation data plus P0016-family codes tell the story.

Engine · Generic OBD-II

P0366 — Camshaft Position Sensor "B" Circuit Range/Performance (Bank 1)

The exhaust-cam position signal on Bank 1 is implausible — a failing sensor, an oily connector, or timing drift confusing the reading.

By iCarsoft Engineering Team Updated July 2, 2026 Checked against SAE J2012

Quick reference

Severity

Medium

Safe to drive

Caution

System

Engine

Code type

Generic

Repair level

DIY-Moderate

Typical cost

$60–$1,400

Oil wicking into the sensor connector is a famous cause on several engine families — a $0 inspection worth doing first.

What triggers it

Common causes, most likely first

Failing cam sensor B

The exhaust-cam sensor's signal degrades or drops out.

Very common

Oil intrusion in the connector

Oil wicks up the harness into the plug, corrupting the signal.

Common

Wiring/connector damage

Chafe, heat damage or bent pins on the sensor circuit.

Common

Reluctor/tone wheel debris or damage

Metal fuzz on the trigger wheel distorts the pattern.

Occasional

Timing chain stretch

Real cam-to-crank drift beyond spec reads as an implausible signal.

Occasional

How it shows up

Symptoms you'll notice

Hard start / long crank — the ECU struggles to sync.
Stalling or rough running — sync losses at idle.
Check Engine light — sometimes intermittent first.
Possible no-start — if the signal disappears entirely.

How to pinpoint it

Diagnostic steps

Inspect the connector for oil

Unplug sensor B and look — oil in the plug means cleaning/repair plus checking the sensor seal.Tool: visual

Compare cam B vs crank signals live

Watch correlation at idle and rpm; dropouts or drift show directly.Tool: live data / scope

Verify supply and ground

Back-probe reference voltage and ground at the connector.Tool: multimeter

Check correlation for chain stretch

Persistent offset (with P0016-family codes) points mechanical, not electrical.Tool: live data

Replace the sensor

With wiring proven and correlation sane, replace sensor B.Tool: hand tools

What the fix costs

Repair & cost

Cam position sensor

$60–200

Usually easy access

Wiring/connector repair

$80–250

Oil-intrusion cleanup

Timing chain job

$600–1,400

Only if truly stretched

Estimates are indicative and vary by region, vehicle and parts choice. Confirm the actual cause with live data before buying parts.

Diagnose it yourself

The right iCarsoft tool for P0366

iCarsoft CR Pro S

CR Pro S overlays cam and crank signals live, exposing dropouts, noise and correlation drift — the difference between an $80 sensor and an unnecessary timing-chain quote.

Full-system scanLive data graphingBi-directional testsService resets

View iCarsoft CR Pro S Compare tools

Coming soon

Analyze your exact vehicle with the AI Co-Pilot

Enter your make, model and what you're seeing — the iCarsoft AI assistant will rank the likely causes for your car and suggest the next test.

Try the AI Co-Pilot

Quick answers

P0366 FAQ

Can I drive with P0366?: If it runs normally, short careful trips are OK — but a degrading sensor can strand you with a no-start, so don't postpone long.
Sensor A vs Sensor B?: On most Bank 1 twin-cam engines, A is the intake cam sensor and B the exhaust cam sensor. P0366 concerns B.
Could it be the timing chain?: Yes, on high-mileage engines — but only after ruling out the sensor, connector oil and wiring. Correlation data plus P0016-family codes tell the story.

P0366 — Camshaft Position Sensor "B" Circuit Range/Performance (Bank 1)