Faulty camshaft position sensor 'B' on Bank 1, often due to heat damage or internal failure; Damaged, chafed, or corroded wiring in the sensor circuit, particularly near the exhaust manifold or timing cover; Loose or contaminated sensor connector pins causing intermittent signal loss; Metal debris or sludge buildup on the sensor tip or tone wheel, disrupting the magnetic signal; Stretched timing chain or worn timing belt causing camshaft-to-crankshaft correlation to drift out of range; Failed variable valve timing solenoid or phaser affecting camshaft timing and sensor signal; Engine computer software or internal fault, though this is the least common cause

DTC codes / P03xx · Ignition system and misfire / P0366

P0366Camshaft Position Sensor 'B' Circuit Range/Performance (Bank 1)

P0366 means the engine computer has detected an out-of-range or erratic signal from the camshaft position sensor circuit for Bank 1 sensor 'B', which is typically the exhaust camshaft sensor on engines with variable valve timing. The computer compares the camshaft signal against the crankshaft signal and sets this code when the expected correlation or signal pattern is not met during a specified test window.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Illumination of the check engine light, often with no other symptoms besides the warning light
Rough idle or intermittent engine stumble, especially when the engine is cold or under light load
Reduced engine power or a limp-home mode with limited RPM
Hard starting or extended cranking before the engine fires
Poor fuel economy or increased emissions noticeable over time
Occasional stalling when coming to a stop or during deceleration

Common causes, most likely first

Faulty camshaft position sensor 'B' on Bank 1, often due to heat damage or internal failure
Damaged, chafed, or corroded wiring in the sensor circuit, particularly near the exhaust manifold or timing cover
Loose or contaminated sensor connector pins causing intermittent signal loss
Metal debris or sludge buildup on the sensor tip or tone wheel, disrupting the magnetic signal
Stretched timing chain or worn timing belt causing camshaft-to-crankshaft correlation to drift out of range
Failed variable valve timing solenoid or phaser affecting camshaft timing and sensor signal
Engine computer software or internal fault, though this is the least common cause

How to diagnose and fix it

Scan all modules for stored and pending codes, then record freeze-frame data to see the conditions when P0366 set
Visually inspect the sensor, connector, and wiring harness for damage, corrosion, or oil contamination, and repair as needed
Remove the sensor and check the tip and tone wheel for metal shavings, sludge, or physical damage, then clean or replace if necessary
Measure sensor resistance and check the signal waveform with an oscilloscope while cranking or running, comparing it to the manufacturer's specification
Verify camshaft-to-crankshaft timing correlation with a scan tool or oscilloscope to rule out a stretched chain or belt
Test the variable valve timing solenoid and phaser operation if the sensor and wiring check out good
Replace the camshaft position sensor 'B' with a quality part, clear codes, and road-test to confirm the repair

Before you replace the camshaft sensor

A stretched timing chain often sets P0366 without any sensor fault at all, so always verify cam-to-crank correlation before condemning the sensor.
Oil sludge or metal debris on the sensor tip can mimic a failed sensor, and simply cleaning it may resolve the code on high-mileage engines.
Intermittent wiring faults near the exhaust manifold are common because heat cycles harden insulation and cause internal breaks that only act up when hot.
A failing variable valve timing solenoid can alter camshaft timing enough to trigger P0366 even when the sensor signal itself looks perfect on a scope.
This code does not always mean the sensor is dead; a poor ground or reference voltage drop at the computer can produce the same range/performance fault.

Can I keep driving with P0366?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration, towing, or long highway trips because the engine may enter limp mode or stall unexpectedly. If the engine runs rough, stalls, or loses power, stop driving and have it diagnosed promptly.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.