Parts for your 2017 Toyota Prius-Crank angle sensor

2017 Toyota Prius crank angle sensor: what it does and how to look after it

Yes, the 2017 Toyota Prius is fitted with a crank angle sensor (commonly called the crankshaft position sensor, or CKP). Toyota’s Technical Information System (TIS) Repair Manual for the ZVW50 series (2016–2018) lists the CKP sensor as part of the SFI system and defines related DTCs such as P0335/P0339. The Prius New Car Features (NCF) manual also describes the engine start/stop strategy that relies on precise crank angle feedback, and the Toyota Electrical Wiring Diagram (EWD) shows the CKP signal routed to the ECM. So it’s absolutely relevant on this model.

On a 2017 Prius, the crank angle sensor is the ECM’s timekeeper. It tracks crankshaft speed and position so the hybrid system can fire the engine exactly when needed, sync fuel injection and ignition, and verify combustion quality. Because the Prius’ engine stops and starts frequently, the CKP signal is critical for smooth, near-seamless restarts and for misfire monitoring that keeps emissions in check.

It’s not a scheduled service item, but a bit of preventive care goes a long way. During routine servicing, a technician can visually check the sensor harness near the timing chain cover for chafing, oil contamination, or loose connectors. Keeping the area clean and dry helps avoid intermittent signals that can trigger the MIL. If DTCs P0335 or P0339 pop up, or the car has extended cranking, stalls when coming to a stop, or rough idle after an engine start, the CKP and its wiring deserve a close look.

Replacement, if required, is straightforward for a trained tech. On the Prius, the sensor mounts at the lower front of the engine near the crank pulley. Best practice is to:

• Make sure the vehicle is fully powered down (not in READY), then disconnect the negative terminal of the 12 V battery.
• Avoid touching any orange high-voltage cabling, no HV components need to be opened for CKP work.
• Inspect the reluctor area for debris and verify the connector pins are clean and tight before fitting the new sensor.
• Clear DTCs and confirm a clean CKP signal with scan data after replacement, followed by a road test covering a range of engine starts.

There’s no set kilometre interval for replacement—swap it when diagnostics show it’s out of spec or damaged. Using an OE-quality sensor, keeping the connector sealed, and routing the loom exactly as per the repair manual helps ensure the Prius keeps starting and running silky-smooth.

Popular questions about the 2017 Toyota Prius crank angle sensor

Where is the crank angle sensor located on a 2017 Prius?
It’s mounted low on the engine at the front (driver’s side on RHD markets), reading a toothed wheel on the crankshaft inside the timing cover. Access is from the front of the engine bay, the connector and harness run up to the ECM.

What are the signs of a failing crank angle sensor?
Common clues include hard starting, the engine cutting out as you come to a stop, uneven idle during engine restarts, and the check engine light with codes like P0335 or P0339. Because the Prius starts the engine often, intermittent faults can feel like a brief shudder or stumble right as the engine kicks in.

Is it safe to drive a Prius with a CKP fault code?
If the vehicle still runs, it may go into a reduced-function state and could stall unexpectedly. It’s best to avoid driving long distances and have it diagnosed promptly. A proper scan, wiring check, and sensor test will confirm whether the sensor or the loom is at fault.