OBD-II diagnostic trouble code
P0320Stop driving

Ignition/Distributor Engine Speed Input Circuit Malfunction

The circuit that tells the ignition system engine speed has failed, which on many engines can prevent starting entirely since spark timing can't be calculated.

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Code names are compiled from open/standardized SAE and ISO references. Explanations, symptoms, causes and fixes are original. Covers generic (P0/C0/B0/U0) codes only — manufacturer-specific codes are planned for a future update.

Frequently asked questions

Can I drive with P0320?

No — P0320 is flagged as a code where you should stop driving and get the car checked as soon as possible. Continuing to drive risks further damage or a safety issue.

How much does it cost to fix P0320?

The cost varies too much by cause and vehicle to give a single figure here — a diagnosis will narrow it down.

What causes P0320?

AS
Reviewed by Artyom SemenovAutomotive Editor · Fact-checked by Yauheni Kapliarchuk, Editor-in-Chief
Code names compiled from open SAE/ISO references; explanations and repair guidance are original editorial content
Last verified: 09 Jul 2026 · Our methodology