AutoCodes – Generic – P1323

P1323 Code - 24X Reference Circuit Low Frequency

Quick Answer

The Ignition Control Module creates a 4X signal and a 24X signal that is used by the PCM for ignition and fuel control. Common causes include Faulty 24X CKP sensor, 24X CKP sensor harness is open or shorted, 24X CKP sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1323 indicates 24X Reference Circuit Low Frequency.
Common causes: Common causes include Faulty 24X CKP sensor, 24X CKP sensor harness is open or shorted, 24X CKP sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 9,236

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 19, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1323 Description

The Ignition Control Module creates a 4X signal and a 24X signal that is used by the PCM for ignition and fuel control. In this diagnostic test, the PCM checks for 4X reference pulses being received without 24X reference pulses. When the engine is running and the PCM is receiving 4X reference pulses without 24X reference pulses and the 24X reference signal line is low for 4 seconds, DTC P1323 is set.

OBDII Code P1323 - 24X Reference Circuit Low Frequency - AutoCodes.com — P1323 Code - 24X Reference Circuit Low Frequency

What does this mean?

What are the Possible Causes of the DTC P1323?

Faulty 24X CKP sensor
24X CKP sensor harness is open or shorted
24X CKP sensor circuit poor electrical connection

How to Fix the DTC P1323?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1323 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1323 code?

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Information for Specific Makes

P1323 Audi — Knock Sensor 4 Signal Too Low
P1323 Buick — 24X Reference Circuit Low Frequency
P1323 Cadillac — 24X Reference Circuit Low Frequency
P1323 Chevrolet — IC 24X Reference Circuit Low Frequency
P1323 Chrysler — Cylinder 2 Oil Supply Solenoid Valve Switch ON Time Immeasurable
P1323 Dodge — Cylinder 2 Oil Supply Solenoid Valve Switch ON Time Immeasurable
P1323 Fiat — Cylinder 2 Oil Supply Solenoid Valve Switch ON Time Immeasurable
P1323 GMC — IC 24X Reference Circuit Low Frequency
P1323 Hyundai — Ignition Coil 4 High Output
P1323 Jeep — Cylinder 2 Oil Supply Solenoid Valve Switch ON Time Immeasurable
P1323 Volkswagen — Knock Sensor 4 Signal Too Low

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.