Crankshaft Position Sensor A Circuit Malfunction
The P0335 code indicates that the Engine Control Module (ECM) has detected a malfunction in the crankshaft position sensor circuit. This sensor is critical for engine timing, fuel injection, and ignition. The ECM uses the signal from the sensor to determine the position and speed of the crankshaft. A failure can cause the engine to run poorly or not start at all.
1. Most Common Causes
- Faulty or damaged crankshaft position (CKP) sensor
- Open, short-to-ground, or short-to-power in the CKP sensor circuit wiring
- Loose, corroded, or damaged terminals in the CKP sensor connector
- Damaged, broken, or misaligned reluctor ring on the crankshaft
- Mechanical timing issue (jumped timing chain or belt)
- Internal PCM failure (rare)
2. Symptoms You Will Notice
- Engine cranks but does not start
- Intermittent stalling or rough running
- Check Engine Light illuminated
- Poor fuel economy and performance
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the sensor and wiring for damage or corrosion.
Step 3: Test sensor resistance and voltage with a multimeter.
Step 4: Check for proper sensor gap and alignment.
Step 5: Replace sensor if faulty; clear codes and test drive.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The engine may stall or fail to start, leading to a breakdown or accident.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on vehicle make and sensor location.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.