P0320 medium Severity

P0320: Ignition/Distributor Engine Speed Input Circuit Malfunction

May cause engine hesitation, stalling, difficulty starting, and misfires; potentially inhibit engine start or operation depending on severity.

Overview

P0320 indicates a malfunction in the ignition/distributor engine speed input circuit, typically involving the crankshaft position sensor or related wiring and signaling circuits.

Common Symptoms

  • Check Engine Light (CEL) illuminated
  • Engine hesitates, stumbles, or misfires
  • Engine cranks but does not start
  • Reduced power or acceleration issues

Most Common Causes

Faulty crankshaft position sensor high

Primary cause of signal disruption to the PCM leading to code P0320.

Damaged or corroded wiring/connectors in engine speed input circuit high

Wiring harness issues frequently interrupt sensor communication.

Faulty camshaft position sensor or ignition/distributor pickup medium

Depending on engine design, related input sensors can trigger P0320.

Open or short in power/ground circuits to sensors medium

Electrical faults in supply or ground lines can mimic sensor failure.

ECM/PCM internal fault low

Less common but possible if all sensor and wiring tests check normal.

Diagnostic Steps

  1. Verify P0320 code with OBD-II scanner and check for additional codes.
    Expected: P0320 present; note if other related codes present (e.g., P0335, P0340).
    Interpretation: Confirm baseline before beginning circuit tests.
  2. Visually inspect crankshaft and camshaft position sensor wiring and connectors.
    Expected: Clean, undamaged connectors; no frayed or exposed wiring.
    Interpretation: Damage or corrosion indicates wiring repair required.
  3. Test sensor power supply and ground at sensor harness with a multimeter.
    Expected: Proper reference voltage (often 5V) and good ground.
    Interpretation: Incorrect readings indicate supply/ground circuit faults.
  4. Measure sensor output signal while cranking (e.g., AC voltage for magnetic pickup).
    Expected: Signal within manufacturer spec.
    Interpretation: Absent or erratic signal suggests sensor or tone wheel issues.
  5. If sensors and wiring test good, evaluate ECM/PCM input circuits.
    Expected: Proper diagnostic interface readings.
    Interpretation: Persistent faults with no wiring/sensor errors raise ECM/PCM concerns.

Repair Solutions

Replace crankshaft position sensor medium
Estimated Cost: $100 - $300

Most common and effective repair when sensor fails.

Repair or replace damaged wiring/connectors medium
Estimated Cost: $100 - $500

Cost varies with extent of wiring harness repair needed.

Replace camshaft position sensor or distributor pickup if applicable medium
Estimated Cost: $120 - $400

Applicable on engines where this sensor contributes to engine speed input.

ECM/PCM repair or reflash hard
Estimated Cost: $500 - $1500

Considered only after all sensor and wiring diagnostics are completed.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Replacing crankshaft position sensor without checking wiring/connectors first
  • Faulty camshaft position sensor incorrectly blamed for P0320

Frequently Asked Questions

What is the definition of the P0320 engine code?

Technically, the P0320 code represents Ignition/Distributor Engine Speed Input Circuit Malfunction. It usually points to a fault within the Ignition.

Is it safe to drive with a P0320 code?

The P0320 code is considered medium severity. May cause engine hesitation, stalling, difficulty starting, and misfires; potentially inhibit engine start or operation depending on severity.

How do I know if I have code P0320?

Drivers often report: Check Engine Light (CEL) illuminated, Engine hesitates, stumbles, or misfires, Engine cranks but does not start when this code is present.

Potential causes for OBDII code P0320

The most common causes are: Faulty crankshaft position sensor, Damaged or corroded wiring/connectors in engine speed input circuit, Faulty camshaft position sensor or ignition/distributor pickup.

Estimated repair costs for different causes of P0320

It depends on what needs to be fixed. Replace crankshaft position sensor repairs are cheaper (~$300), while ECM/PCM repair or reflash repairs are on the higher end (~$1500).

Does code P0320 apply to Toyota vehicles?

The P0320 code is a generic powertrain code, meaning it applies to almost all makes and models, such as Honda, Toyota, VW, Ford, and Chevy.

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