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P0335 with live data shows a missing or erratic CKP signal. A Bluetooth OBD2 scanner that can read engine RPM signal quality and trigger freeze frame data will confirm whether this is a sensor failure or a wiring issue. See top-rated scanners on Amazon ↗
🗺️ Where Is the Problem?
Blueprint view - P0335 fault at crankshaft position sensor at bottom of engine block; no CKP signal means ECM cannot time ignition or injection
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0335 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
65%
#1 - Most Likely
Failed Crankshaft Position Sensor
The sensor itself has failed internally. Common on high-mileage vehicles. The engine may crank but not start, or stall intermittently.
DIY Cost
$80–$300
22%
#2 - Check First
Damaged Wiring or Connector
Chafed, broken, or corroded wiring between the sensor and ECM. Common in high-heat areas near the exhaust.
DIY/Shop Cost
$50–$200
8%
#3 - Less Common
Damaged Reluctor Wheel
The toothed ring on the crankshaft that the sensor reads gets chipped or bent, creating signal gaps. Usually requires short block access.
Shop Cost
$300–$800
5%
#4 -
ECM Fault
Rare but possible. Only diagnose after confirming sensor and wiring are good.
Shop Cost
$300–$1,500
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Attempt to start - if engine cranks but won't fire, CKP is the prime suspect. Check for spark at a plug to confirm ignition is affected.
- Locate the CKP sensor (typically at the front or bottom of the block near the crankshaft pulley) and inspect the connector for corrosion or damage.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need