◆OBD Codes

P0327

Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

Moderatesensor

Overview

The P0327 diagnostic trouble code means the PCM has identified a knock sensor 1 circuit low input (bank 1 or single sensor) problem. This code indicates that a sensor or its circuit is not providing expected readings to the engine management system. Faulty sensor data can cause the PCM to make incorrect adjustments, affecting engine performance.

Symptoms

  • Poor fuel economy
  • Reduced engine performance
  • Erratic engine behavior
  • Hard starting in certain conditions

Common Causes

  • Faulty sensor (out of range or failed)
  • Sensor contamination or buildup
  • Faulty PCM (Powertrain Control Module)
  • Physical damage to sensor

Diagnosis Steps

  1. 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
  2. 2Locate the specific sensor referenced by the code
  3. 3Inspect the sensor connector for corrosion, damage, or loose pins
  4. 4Test the sensor output using a multimeter or scan tool live data
  5. 5Check the wiring between the sensor and the PCM for opens or shorts

Estimated Repair Cost

$75 — $350

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Chevrolet CruzeToyota CorollaHyundai ElantraFord Focus

Related Codes

P0100P0110P0115

More Sensor Codes

P0070Ambient Air Temperature Sensor Circuit
Low
P0071Ambient Air Temperature Sensor Range/Performance
Low
P0072Ambient Air Temperature Sensor Circuit Low
Low
P0073Ambient Air Temperature Sensor Circuit High
Low
P0074Ambient Air Temperature Sensor Circuit Intermittent
Low
P0095Intake Air Temperature Sensor 2 Circuit
Low

Frequently Asked Questions

Most automotive sensors last 80,000-150,000 miles, though this varies by sensor type and driving conditions. Oxygen sensors and temperature sensors tend to degrade gradually over time.