What causes fault code P0337?

• Most likely: Faulty crankshaft position sensor (internal short or low resistance) • Likely: Damaged wiring harness (shafed insulation shorting to ground) • Possible: Damaged or dirty reluctor ring (tone wheel) • Rare: Incorrect air gap between the sensor and the reluctor ring

How do you fix fault code P0337?

STEP 1: Visually inspect the sensor connector for oil intrusion, corrosion, or bent pins. STEP 2: Inspect wiring harness for chafing points. Measure continuity and check for short to ground on the signal wire (should be >10k Ohms to ground when disconnected). STEP 3: Measure sensor resistance (if inductive). Typically 500-1500 Ohms. STEP 4: Use an oscilloscope to verify the waveform while cranking. Look for a clean signal with consistent amplitude. STEP 5: If the signal is weak or missing, replace the Crankshaft Position Sensor.

Powertrain (Engine & Gearbox)Standard EOBD

P0337 - Crankshaft Position Sensor A Circuit Low Input

Q: What are the symptoms of fault code P0337?

• Check Engine Light on • Engine hard to start (extended cranking) • Engine stalling or cutting out while driving • Engine misfiring or hesitating • Tachometer not moving while cranking

Last updated:1 February 2026

Related:Crankshaft Position Sensor (CKP), Reluctor Ring, Engine Control Module (ECM/ECU), Camshaft Position Sensor (CMP)

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0300

Random or Multiple Cylinder Misfire Detected

P0301

Cylinder 1 Misfire Detected

P0302

Cylinder 2 Misfire Detected

P0303

Cylinder 3 Misfire Detected

Technical Description

P0337 is defined as Crankshaft Position (CKP) Sensor A Circuit Low Input. The Engine Control Unit (ECU) monitors the signal from the CKP sensor to determine engine RPM and precise crankshaft position. If the signal voltage drops below a calibrated threshold while the engine is cranking or running, the ECU flags this code. This is usually caused by a short to ground in the signal wire, a failing sensor with low internal resistance, or an incorrect air gap between the sensor and the reluctor ring.

Possible Causes

Faulty crankshaft position sensor (internal short or low resistance)

Damaged wiring harness (shafed insulation shorting to ground)

Damaged or dirty reluctor ring (tone wheel)

Incorrect air gap between the sensor and the reluctor ring

Symptoms

Check Engine Light on

Engine hard to start (extended cranking)

Engine stalling or cutting out while driving

Engine misfiring or hesitating

Tachometer not moving while cranking

Do you also have
other fault codes?

See how P0337 connects with your other fault codes. Our advanced analysis tool identifies causal relationships and root causes directly.

Analyze multiple codes

P0337 - Crankshaft Position Sensor A Circuit Low Input

Related Fault Codes

Technical Description

Possible Causes

Symptoms

Recommended Solution

Workflow

Mechanic's Tip

Do you also have
other fault codes?

P0337 - Crankshaft Position Sensor A Circuit Low Input

Related Fault Codes

Technical Description

Possible Causes

Symptoms

Recommended Solution

Workflow

Mechanic's Tip

Do you also have other fault codes?

Do you also have
other fault codes?