P1335
Crankshaft Position Sensor (REF Signal Circuit)
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The P1335 code on Nissan vehicles indicates the Engine Control Module is not receiving a proper reference signal from the crankshaft position sensor (CKP). This sensor is critical — it tells the ECM exactly where the crankshaft is in its rotation so the ECM can precisely time fuel injection and ignition. Without a reliable signal, the engine may stall, misfire, or refuse to start entirely.
The most alarming symptom is an engine that suddenly stalls while driving, which can be a safety concern in traffic. You may also notice the tachometer needle dropping to zero momentarily before the engine recovers. Hard starting, especially when the engine is hot, is another common complaint with this code.
Before replacing the sensor, check the battery voltage and charging system — on some Nissan models, a weak battery can produce a signal that's too faint for the ECM to read properly. If the battery checks out, the CKP sensor itself is the most likely culprit. It's typically located near the bottom of the engine block near the crankshaft pulley or on the transmission bell housing. The sensor itself costs $25–$100, and the replacement is moderately accessible on most Nissan engines. Professional repair runs $150–$400.
Severity
Symptoms
- •Engine stalls unexpectedly
- •Engine cranks but won't start or is hard to start
- •Random misfires while driving
- •Engine cuts out momentarily then recovers
- •Check engine light is on
- •Tachometer needle may drop to zero intermittently
Likely Causes
The CKP sensor has failed or is intermittently losing signal due to internal component degradation, especially common on higher-mileage Nissan engines.
The wiring harness or connector for the crankshaft position sensor has been damaged by heat, oil contamination, or corrosion, causing signal dropouts.
The air gap between the CKP sensor and the crankshaft reluctor ring has widened due to sensor mounting issues or reluctor ring damage, weakening the signal.
On some Nissan models, low battery voltage or a weak starter can produce a weak CKP signal during cranking, triggering this code even when the sensor itself is functional.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the crankshaft position sensor
- Inspect and repair wiring and connectors to the CKP sensor
- Check and replace the battery if voltage is low
- Verify proper sensor mounting and air gap to reluctor ring