Powertrain, generic · Ignition system or misfire

P0366 Camshaft Position Sensor B Circuit Range/Performance Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Camshaft position sensor B is the exhaust camshaft sensor (bank 1 = side with cylinder 1), usually a Hall sensor on the exhaust cam phaser. P0366 means its pulses arrive, but their number or position does not fit the crankshaft. GM expects 400 pulses per 100 engine cycles and sets the code outside 398–402, or with fewer than 4 or more than 6 pulses in the first 12 reference events at start, 8 of 10 samples, after two trips. On GM's 3.6-litre V6 in the Saab 9-4X the exhaust phaser then goes to its park position and ignition runs from the crankshaft alone; on the 2.8 turbo V6 (LAU) the fault must last 1 s, or 10 s cumulatively, below 2,520 rpm. Saab's workshop information names a damaged tone wheel, play, foreign matter and too large an air gap. Ford uses the code too but publishes no thresholds.

Likely causes

Sensor faulty or dirty (metal debris on the magnet)
Wiring close to ignition coils or solenoids, loose contact
Tone wheel on the phaser damaged or loose, air gap too large
Sensor or phaser wrongly fitted after timing drive work

Symptoms

  • Check engine light on
  • Longer cranking before the engine starts
  • Loss of power or rough idle (exhaust cam timing in its base position)
  • Higher fuel consumption

Repair estimate

DifficultyEasyDIY possible
Parts and labour€60–300
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

camshaft position sensor exhaustcamshaft tone wheelsensor wiringengine control modulecam phaser exhaust bank1

Related codes

P0365P0367P0368P0369P0391P0017

References: gsi.ext.gm.com, saabwisonline.com, saabwisonline.com, fordservicecontent.com.