P0366: How to Diagnose & Fix — Camshaft Position Sensor "B" Circuit Range/Performance (Bank 1)
2 vehicles · 2 makes · $1,500-$3,500 repair
How to diagnose and fix P0366: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Buick Cascada · 2017–2018
2017-2018 Cascadas with the 1.6L LWC can set a check engine light with P0366 (exhaust camshaft position sensor circuit range/performance) and/or P0014 (exhaust cam timing over-advanced) with no driveability complaint. GM's bulletin 17-NA-338 (October 2017) says the cause is an exhaust cam phaser that sporadically fails to lock and oscillates during engine start, which the ECM misreads as a timing fault. The codes are false; there is no mechanical phaser or timing chain defect, so replacing the phaser, actuator solenoid or cam sensor does not fix it.
Common Symptoms
- Check engine light shortly after a cold start
- P0366 stored
- P0014 stored
- No noticeable running problem
How to Fix
Reprogram the engine control module with the latest calibration via SPS (GM 17-NA-338, listed in the Cascada TSB record as 'ECM update to correct MIL illumination'). Do not replace hardware first. Under the 8yr/80k emissions or bumper-to-bumper warranty the reflash is free; out of warranty a dealer reflash is typically $120-$200. If the codes return after the update, then diagnose the phaser, cam sensor and oil control valve per SI.
Sources for this issue (2)
Volkswagen Passat · 2008–2017
The Passat shares the same EA888 2.0T TSI timing chain tensioner issue as other VW/Audi models. The original tensioner design allows the chain to go slack when the engine is off, and on restart the chain can skip timing. Early revisions of the tensioner were inadequate and VW issued multiple updated part numbers. The Passat is particularly affected in the 2008-2014 model years.
Common Symptoms
- Rattling on cold start
- Check engine light for cam/crank correlation
- Engine misfires
- Loss of power
- Engine will not start (chain jumped)
How to Fix
Replace with the latest revision timing chain tensioner (check VW TSB for current part number). Best practice is to replace the full timing chain kit including chain, tensioner, guides, and cam adjusters. Verify correct timing with a timing chain alignment tool set after installation. Some shops recommend the INA or Febi kits which include all necessary components.
Sources for this issue (1)
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P0366 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0366 mean?
P0366 stands for "Camshaft Position Sensor "B" Circuit Range/Performance (Bank 1)." This code indicates the 'B' camshaft position sensor on Bank 1 is electrically present but its signal is out of the expected range or inconsistent with the crankshaft position signal. The PCM uses this sensor to track camshaft timing for fuel, spark, and variable valve timing control. A range/performance fault can cause rough idle, hesitation, reduced power, or hard starting. It often points to sensor or timing alignment issues rather than a fully open circuit.
What are the most common causes of P0366?
The most common causes of P0366 are: Failing camshaft position sensor (Bank 1, sensor B), Damaged reluctor/tone ring or excessive air gap, Timing chain/belt stretch or jumped timing, Wiring/connector intermittent fault or corrosion, Oil contamination on the sensor, Variable valve timing actuator fault. The specific cause varies by vehicle.
How much does it cost to fix P0366?
Repair costs for P0366 range from $1,500 to $3,500, depending on the vehicle and root cause.
Which vehicles are affected by P0366?
Au7o has documented P0366 across 2 vehicle models from 2 manufacturers: Buick, Volkswagen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.