System: Powertrain (P-Code) Coverage: SAE Standard (Generic) Fault Family: crank_position_sensor_circuit

Code P0335: Crankshaft Position Sensor A Circuit

Diagnostic & Technical Explanation

Code P0335 (Crankshaft Position Sensor A Circuit) sets when the ECM sees an open circuit, out-of-range voltage, no signal, or an erratic pulse pattern from a crankshaft position sensor (or, on older distributor-based ignition systems, the distributor's engine-speed pickup that serves the same function). Common causes are a sensor with too large an air gap to the reluctor wheel, metal debris bridging the sensor tip, a corroded connector, or chafed wiring between the sensor and the ECM.

Probability-Ranked Repair Procedures (4 Ranked Fixes)

Rank #1

Inspect and reseat the crankshaft position sensor connector

Easy DIY

Parts Estimate: $5.0–$15.0 USD Labor Estimate: 0.4 Shop Hours

1. Locate the sensor near the crank pulley or bellhousing
2. Unplug and inspect for oil intrusion or corroded pins
3. Clean contacts and reseat until it clicks
4. Clear the code and crank the engine to verify a start

Required Replacement Parts: 🔧 Electrical contact cleaner

Rank #2

Replace the crankshaft position sensor

Moderate DIY

Parts Estimate: $30.0–$140.0 USD Labor Estimate: 0.7 Shop Hours

1. Remove the sensor's retaining bolt and withdraw it from its bore
2. Inspect the reluctor wheel/tone ring for damaged teeth or debris
3. Install the replacement sensor, setting the air gap per spec if not self-adjusting
4. Clear codes and confirm a stable RPM signal at idle and under load

Required Replacement Parts: 🔧 Crankshaft position sensor

Rank #3

Repair crankshaft position sensor circuit wiring

Professional Required

Parts Estimate: $10.0–$65.0 USD Labor Estimate: 1.4 Shop Hours

1. Back-probe the signal, shield, and ground legs at the sensor connector
2. Voltage-drop test each leg back to the ECM
3. Repair chafed or corroded conductors with soldered, heat-shrunk splices
4. Confirm a clean signal waveform on a scope while cranking

Required Replacement Parts: 🔧 Automotive wiring repair kit (solder + heat-shrink)

Rank #4

Clean or replace a damaged reluctor wheel/tone ring