What Does P1335 Mean?
P1335 indicates that the ECU has lost the crankshaft position sensor (CKP) signal while the engine is running. The crankshaft position sensor is critical for ignition timing and fuel injection synchronization. Loss of this signal while running typically causes the engine to stall immediately, as the ECU cannot determine piston position or engine speed.
Safety Warning
Loss of the CKP signal causes immediate engine stall, which creates a dangerous situation in traffic. Power steering and brake assist are lost when the engine stalls. Do not drive until repaired.
Common Causes
35%
Failed crankshaft position sensor
25%
Damaged or intermittent wiring in the CKP sensor circuit
15%
Excessive air gap between CKP sensor and reluctor ring/tone wheel
15%
Damaged or missing teeth on the crankshaft reluctor ring
10%
Corroded or loose CKP sensor connector
Diagnostic Steps
1
Attempt to reproduce the condition. Note if the engine stalls at specific RPMs, temperatures, or under vibration, which suggests an intermittent connection.
2
Inspect the CKP sensor connector for corrosion, loose terminals, or heat damage. Check the wiring harness routing for chafing near exhaust components.
3
Measure CKP sensor resistance (typically 200-1000 ohms for magnetic type) and compare to specifications. Check for shorts to ground or open circuits.
4
Inspect the reluctor ring (crankshaft tone wheel) for damaged, missing, or contaminated teeth using a borescope or by removing the sensor.
5
Verify the air gap between the sensor tip and reluctor ring is within specification. Adjust or replace mounting hardware as needed.
6
If all physical checks are good, monitor the CKP signal with an oscilloscope while wiggling connectors and harness to find the intermittent fault.
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
P1335 indicates that the ECU has lost the crankshaft position sensor (CKP) signal while the engine is running. The crankshaft position sensor is critical for ignition timing and fuel injection synchronization. Loss of this signal while running typically causes the engine to stall immediately, as the...
The most common cause of P1335 (No Crankshaft Position Sensor Signal - Engine Running) is: Failed crankshaft position sensor
Typical repair costs for P1335 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of the CKP signal causes immediate engine stall, which creates a dangerous situation in traffic. Power steering and brake assist are lost when the engine stalls. Do not drive until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1335 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Position Sensing / Ignition System
Difficulty
Type
Manufacturer
Recommended Tools
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