#OBD Codes
P0335 – Crankshaft position sensor "A" circuit malfunction
Technical definition
Crankshaft position sensor A circuit
What does P0335 mean?
The P0335 code means your engine isn’t receiving a signal from the crankshaft position sensor (or "crank sensor" for short) – a critical component that helps your car run smoothly. This sensor works alongside camshaft sensors to ensure precise engine timing.
When it malfunctions, you might notice reduced power, jerky performance, or even stalling.
But don't rush to replace the sensor just yet – often, the real culprit is damaged wiring or a broken circuit. Check the connections first to save time and money.
What does the crankshaft position sensor do?
Your crankshaft position sensor monitors how fast your engine’s crankshaft is spinning and its position at any moment. It sends this critical information to your powertrain control module (PCM), which uses it to perfectly time fuel injection and ignition, and calculate engine speed.
Crankshaft position sensor
How serious is the P0335?
The P0335 code is critical because the crankshaft position sensor directly affects engine timing and synchronization. If the sensor isn't providing accurate data, the engine control module will have difficulty managing ignition timing and fuel injection properly.
This can result in inefficient combustion, potential misfires, or even engine stalling. If you don't address this issue, it can lead to significant engine performance problems and costly repairs.
Can I still drive with P0335?
Technically, yes, but it's not worth the risk. With a bad crankshaft sensor, you might experience rough idling, sluggish acceleration, and sudden jerks while driving. These symptoms make your car unpredictable and potentially dangerous – especially when merging onto highways or navigating heavy traffic.
In some cases, your car might enter "limp mode" – a safety feature that limits engine performance to prevent further damage. While this might get you to a nearby repair shop, it's definitely not meant for daily driving.
Common symptoms of P0335
Watch for these warning signs:
- Illuminated check engine light
- Rough, uneven idle
- Increased fuel consumption
- Reduced engine power
- Sudden engine jerks
- Hard starting (multiple attempts needed)
- Vehicle not starting at all
- Unexpected engine stalling
- Vehicle entering limp mode
Common causes of P0335
Most common
- Worn-out crankshaft position sensor
- Frayed or damaged wiring
- Loose electrical connections
Less common
- Damaged or broken reluctor ring
- Broken timing belt
Least common
- Issues with the powertrain control module or engine control module
How to troubleshoot P0335
Here's how to tackle this problem step-by-step:
Clear the codes and test drive
First, use your code reader to clear the P0335 fault code from your car's memory.
- If the code immediately returns: Skip the test drive – you've got an active, ongoing issue that needs immediate attention.
- If the codes clear successfully: Take your car for a 15-minute drive to warm up the engine and see how it behaves.
After your test drive, scan again to see if the code returns. If it does, you've confirmed a persistent problem that needs fixing.
Pro tip: Pay attention to any other trouble codes that appear during your scan – they often provide valuable clues.
Inspect the crankshaft position sensor and its wiring
- Find the crankshaft position sensor. It's typically at the bottom of your engine block, near the crankshaft.
- Inspect the sensor, wiring, and connectors carefully. Sometimes, simply pushing a loose connector back into place fixes the P0335 error code.
- Replace damaged parts. If you notice damaged connectors or frayed wiring, replace them. Old, damaged electrical components can disrupt the entire circuit.
- Test the voltage. Use a multimeter to check the circuit voltage, confirming solid connections and proper power flow.
- Clear the code and restart the car. Use an OBD II scanner to reset the check engine light. Start the car and let it run for a few minutes. Then, take a test drive and scan again to confirm that you resolved the issue.
Don't forget to check your camshaft sensors too – they work as a team with your crankshaft sensor. Problems with one often signal issues with the other. Inspect these sensors and their wiring for similar damage.
After making any repairs or replacements, take your car for a drive and test acceleration to make sure everything's running smoothly again.
Disclaimer: Advice, how-to guides, and car care tips on our blog are intended as helpful resources for general maintenance and repairs. While we strive for accuracy, the information is provided to the best of our knowledge and should be used at your own discretion and risk.
Always refer to your vehicle's owner's manual or consult a certified mechanic for specific repair details and safety procedures.
Always refer to your vehicle's owner's manual or consult a certified mechanic for specific repair details and safety procedures.
