Crankshaft Position Sensor "A" Circuit
What it means
The crankshaft position (CKP) sensor tells the engine computer the engine speed and piston position, which it uses to time spark and injection. The computer has found this sensor's signal missing or invalid, so the engine may not start or may stall suddenly; some cars keep running on the camshaft position sensor with reduced performance.
Related lights
Dashboard lights that may come on with this code.
Symptoms5
- Engine cranks but does not start, or starts slowly.
- Sudden stalling while driving, sometimes restarting after it cools down.
- Stumbling or misfires.
- Tachometer does not move while cranking.
- Check engine light on.
Possible causes6
- Failed CKP sensor, often starting with heat-related dropouts.
- Damaged or corroded connector or wiring, or wiring rubbing on moving parts.
- Oil leaking into the connector or sensor.
- Damaged tone ring or metal debris stuck to the sensor tip.
- Loss of sensor supply or ground on three-wire sensors.
- Engine computer fault (rare).
How to diagnose5
- Watch engine RPM on a scan tool while cranking; no reading confirms the signal is missing.
- Inspect the connector and wiring for oil, corrosion, breaks or chafing.
- Identify the sensor type in the service manual, then measure its supply and ground or its resistance and compare with the manufacturer specification.
- Check the sensor signal on an oscilloscope while cranking if available.
- Remove the sensor and inspect its tip and the tone ring for debris or damage.
How to fix5
- Clean oil and corrosion from the connector and repair damaged wiring.
- Clean metal debris from the sensor tip.
- Replace the CKP sensor with a part that matches the vehicle specification.
- Fix the oil leak that reached the sensor or connector.
- Clear the codes, start the engine, road test and confirm the code does not return.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
In the Saudi market: SAR 100–600 (≈ USD 27–160)
Our prices come from the Saudi market, converted at a fixed rate (SAR 3.75 per USD). Prices in your country may differ a lot, so we show the cost level.
The cost is low for a connector or wiring fault and rises with a new sensor, especially where it is hard to reach; a damaged tone ring, if confirmed, costs more than this range.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
Can I drive with code P0335?
If the engine runs, drive carefully and only a short distance to a shop, because it may stall suddenly on the road. If it will not start or keeps stalling, have it towed.
Why does the engine stall when hot and restart after cooling?
This is a common pattern when a CKP sensor starts to fail: its signal drops out with heat and returns once it cools, which strongly points to the sensor.
Will any aftermarket sensor do?
The sensor must match the vehicle specification. A mismatched sensor can give a weak or different signal, so the code returns or a performance code such as P0336 appears.
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