What causes fault code P0320?

• Most likely: Faulty Crankshaft Position (CKP) sensor or Distributor/Ignition speed sensor • Likely: Wiring harness issues (chafing, open circuit, or short to ground) • Possible: Low battery voltage or EMI interference from a failing starter/alternator • Rare: Failed Engine Control Module (PCM)

How do you fix fault code P0320?

STEP 1: Visually inspect the sensor connector and wiring harness for signs of corrosion or heat damage. Ensure the battery is fully charged (>12.6V). STEP 2: Use a multimeter to verify reference voltage (typically 5V or 12V) and ground integrity (<0.1V drop) at the sensor plug. STEP 3: Perform an oscilloscope test on the signal wire while cranking. Monitor for missing pulses or erratic voltage spikes. Inspect the reluctor ring/tone wheel for debris or physical damage. STEP 4: Replace the faulty sensor and clear the DTCs using a diagnostic tool.

Powertrain (Engine & Gearbox)Standard EOBD

P0320 - Ignition/Distributor Engine Speed Input Circuit Malfunction

Q: What does fault code P0320 mean?

Diagnostic trouble code P0320 is set when the Engine Control Module (ECM/PCM) detects a deviation or interruption in the engine speed signal (CKP - Crankshaft Position or Distributor signal). The PCM relies on this frequency-based signal to calculate engine RPM and timing for ignition and fuel injection. If the signal frequency is inconsistent with the camshaft position or if the pulse width deviates from the expected square wave pattern (on Hall effect sensors) or AC sine wave (on inductive sensors), the PCM enters a failsafe mode or shuts down the engine.

Q: What are the symptoms of fault code P0320?

• Check engine light illuminated • Engine stalls sporadically while driving • Engine cranks but will not start (No-start condition) • Engine hesitates or misfires during acceleration

Last updated:1 February 2026

Related:Crankshaft Position Sensor (CKP), Camshaft Position Sensor (CMP), Distributor, Powertrain Control Module (PCM), Reluctor ring

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

Diagnostic trouble code P0320 is set when the Engine Control Module (ECM/PCM) detects a deviation or interruption in the engine speed signal (CKP - Crankshaft Position or Distributor signal). The PCM relies on this frequency-based signal to calculate engine RPM and timing for ignition and fuel injection. If the signal frequency is inconsistent with the camshaft position or if the pulse width deviates from the expected square wave pattern (on Hall effect sensors) or AC sine wave (on inductive sensors), the PCM enters a failsafe mode or shuts down the engine.

Possible Causes

Faulty Crankshaft Position (CKP) sensor or Distributor/Ignition speed sensor

Wiring harness issues (chafing, open circuit, or short to ground)

Low battery voltage or EMI interference from a failing starter/alternator

Failed Engine Control Module (PCM)

Symptoms

Check engine light illuminated

Engine stalls sporadically while driving

Engine cranks but will not start (No-start condition)

Engine hesitates or misfires during acceleration

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P0320 - Ignition/Distributor Engine Speed Input Circuit Malfunction

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P0320 - Ignition/Distributor Engine Speed Input Circuit Malfunction

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