P0335
UniversalCrankshaft Position Sensor A Circuit Malfunction
High SeverityThe P0335 code indicates an issue with the Crankshaft Position Sensor circuit, which measures engine RPM and piston position. A malfunction here can lead to engine stalling, difficulty starting, or even a no-start condition, making the vehicle unreliable or inoperable.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is safely parked with the parking brake engaged and the engine off before performing any work. Disconnect the negative battery terminal before working on electrical components to prevent accidental short circuits or electrical shock. Allow the engine to cool completely to avoid burns from hot engine parts.
Common Symptoms
- Check Engine Light illuminated
- Engine cranks but won't start
- Engine stalls unexpectedly
- Rough idling
- Poor acceleration
- Engine misfires
Common Causes
- Faulty Crankshaft Position Sensor
- Damaged wiring or connectors to the sensor
- Short circuit or open circuit in the sensor's electrical harness
- Faulty Engine Control Module (ECM) (less common)
Frequently reported on: Honda Civic (2001-2005), Toyota Camry (1997-2001), Ford F-150 (2004-2008), Chevrolet Silverado (1999-2006), Nissan Altima (2002-2006)
Diagnostic Steps
- Locate the Crankshaft Position Sensor, usually near the crankshaft pulley or transmission bell housing.
- Inspect the sensor's electrical connector and wiring for signs of corrosion, damage, or loose connections. Clean or repair as needed.
- If the wiring appears intact, disconnect the sensor and test its resistance using a multimeter, comparing readings to manufacturer specifications.
- If the sensor fails the resistance test or shows visible damage, replace it with a new, OEM-quality sensor.
- After replacement, clear the fault code with an OBD-II scanner and test drive the vehicle to confirm the repair.
👨🔧 When to Call a Professional
If the vehicle exhibits a no-start condition or stalls repeatedly while driving after attempting DIY repairs, it is critical to consult a professional mechanic. This could indicate a more complex electrical issue, an improperly installed sensor, or an underlying problem with the engine control module.
Commonly Asked Questions
Can I drive my car with a P0335 code?
It is not recommended to drive with a P0335 code, especially if the engine is stalling or having trouble starting. This could leave you stranded or create a dangerous situation if the engine cuts out while driving.
What is the Crankshaft Position Sensor and what does it do?
The Crankshaft Position Sensor (CKP) monitors the rotational speed and position of the crankshaft. This data is vital for the Engine Control Module (ECM) to properly time fuel injection and ignition, ensuring the engine runs smoothly.
Is a P0335 code always a bad sensor?
While a faulty sensor is the most common cause, the P0335 code indicates a 'circuit malfunction,' which can also point to issues with the sensor's wiring, connectors, or, in rare cases, the Engine Control Module (ECM) itself.
How can I test the Crankshaft Position Sensor?
You can typically test the sensor's resistance using a multimeter, comparing the readings to your vehicle's service manual specifications. Some sensors can also be tested for AC voltage output while cranking the engine.
What happens if I ignore the P0335 code?
Ignoring a P0335 code can lead to persistent engine stalling, difficulty starting, decreased fuel economy, and eventually a complete no-start condition, rendering your vehicle inoperable.