Crankshaft Position Sensor "A" Circuit Intermittent
What it means
The engine computer has seen the crankshaft position (CKP) sensor signal drop out for short periods and then return. This kind of fault is hard to catch because the code can come and go, and it is usually caused by a loose connection or a sensor starting to fail with heat.
Symptoms5
- Repeated sudden stalling, after which the engine restarts.
- Brief stumbling or jerking while driving.
- Occasional hard starting, especially when the engine is hot.
- Tachometer suddenly drops and then recovers.
- Check engine light turning on and off.
Possible causes6
- Loose connector or corroded terminals that do not hold contact.
- Cracked or chafed wiring that breaks contact as the engine vibrates or moves.
- Sensor starting to fail, with its signal dropping out when hot.
- Oil leaking into the connector.
- Metal debris on the sensor tip weakening the signal at times.
- Poor engine ground connections.
How to diagnose5
- Review the freeze frame data to see engine temperature and speed when the dropout occurred.
- Gently wiggle the sensor connector and wiring with the engine running while watching the signal or RPM; any dropout shows where the fault is.
- Inspect the connector terminals for corrosion or looseness, and the wiring for chafing.
- Watch the sensor signal with the engine hot, or carefully warm the sensor, to reveal heat-related failure.
- Remove and clean the sensor tip, and check the ground connections.
How to fix6
- Secure the connector and clean its terminals, replacing it if its locks are broken.
- Repair cracked wiring and secure it away from moving and hot parts.
- Clean the sensor tip and fix any oil leak.
- Repair weak ground connections.
- Replace the CKP sensor if it is proven to drop out with heat.
- Clear the codes, test drive in conditions similar to when the code set, and confirm it does not return.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The cost is low for a connector or wire, rises with a new sensor, and diagnosis may take longer because an intermittent fault needs more monitoring.
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
The code comes and goes. Can I ignore it?
No. Intermittent dropouts can turn into a full stall on the road, which is dangerous at high speed or in traffic, so have it checked soon.
How do I tell a sensor fault from a wiring fault?
If the stumble appears when you move the connector or wiring, the fault is in the connection. If it only appears once the engine is hot, without touching anything, the sensor is the first suspect.
This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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