P1335

P1335 is Nissan-specific: Crankshaft Position Sensor (REF) Intermittent — the ECM lost the reference signal from the CKP sensor briefly enough to set the code but not long enough to stall the engine permanently. The Nissan CKP is typically a Hall-effect sensor reading a toothed reluctor on the crank or flywheel, outputting a 0-5V digital signal at cranking and running speeds. Cheapest-first ladder: scan live data and watch CKP RPM signal during cranking and at idle (should be a clean 0-5V Hall pulse train, no dropouts; some earlier VR sensors run 0.5-1.5V AC at cranking rising to 3-5V AC at idle). Inspect the sensor connector for oil contamination — Nissan CKPs sit near the bellhousing and get oil-misted from rear main seal weeps, which migrates into the connector and corrodes the pins. Wiggle-test the harness while monitoring live data. Pull the sensor, inspect the tip for metal shavings (a magnetic Hall sensor pulls steel debris from a worn reluctor), measure air gap if adjustable, and check the reluctor for chipped teeth. Don't condemn the ECM before you've verified the CKP signal at the ECM connector pin — Nissan ECMs are rarely the failure here.

Vehicle-specific patterns: 2002-2008 Altima/Maxima/Murano with the VQ35DE is the classic P1335 case — the CKP sensor degrades with heat cycles and causes a rolling-stall condition where the engine cuts out for half a second and restarts itself, usually at low RPM or coming to a stop. Nissan issued multiple bulletins on CKP/CMP sensor failures across the VQ family. 2005-2012 Pathfinder/Frontier/Xterra VQ40DE shows identical symptoms plus heat-soak failure where the code only sets after 20-30 minutes of driving and clears on cool-down. 2002-2006 Sentra/SE-R with the QR25DE throws P1335 from CKP failure tied to the same timing-chain stretch that pulls the reluctor wheel out of alignment — confirm chain stretch with a cam-vs-crank scope capture before just replacing the sensor. 1999-2004 Frontier VG33E V6 throws P1335 from the optical distributor pickup degrading rather than a separate CKP. Estimated repair: $180 (CKP sensor DIY) to $2,800 (CKP + timing chain on a QR25).