Faulty 24X crankshaft position sensor or damaged sensor wiring; Worn or damaged 24X reluctor wheel (interrupter ring) on the crankshaft; Poor electrical connection at the sensor or PCM connector; Failed ignition coil pack or spark plug wires causing electrical interference; PCM internal fault affecting the reference circuit input; Corroded or chafed harness between the sensor and PCM

DTC codes / Chrysler codes / P1323

P1323 · Chrysler24X Reference Circuit Low Frequency

Q: What does code P1323 mean?

24X Reference Circuit Low Frequency. P1323 on Chrysler vehicles means the powertrain control module (PCM) is seeing a 24X reference signal from the ignition system that is too low in frequency, indicating the engine speed signal is missing pulses or is erratic. The PCM uses this signal to synchronize fuel injection and ignition timing, so it sets the code when the calculated frequency falls below an expected threshold for the current operating conditions.

P1323 on Chrysler vehicles means the powertrain control module (PCM) is seeing a 24X reference signal from the ignition system that is too low in frequency, indicating the engine speed signal is missing pulses or is erratic. The PCM uses this signal to synchronize fuel injection and ignition timing, so it sets the code when the calculated frequency falls below an expected threshold for the current operating conditions.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Check engine light illuminated, often with no other noticeable symptoms
Engine may stall or misfire intermittently, especially when hot or under load
Rough idle or hesitation during acceleration
Hard starting or a no-start condition in severe cases
Tachometer may read erratically or drop to zero while driving

Common causes, most likely first

Faulty 24X crankshaft position sensor or damaged sensor wiring
Worn or damaged 24X reluctor wheel (interrupter ring) on the crankshaft
Poor electrical connection at the sensor or PCM connector
Failed ignition coil pack or spark plug wires causing electrical interference
PCM internal fault affecting the reference circuit input
Corroded or chafed harness between the sensor and PCM

How to diagnose and fix it

Scan all modules for stored and pending codes, and record freeze-frame data to confirm the 24X signal fault
Inspect the 24X sensor and its wiring for physical damage, corrosion, or loose connections
Check the reluctor wheel for cracks, missing teeth, or debris buildup
Measure the sensor's resistance and compare to factory specifications
Back-probe the sensor signal wire at the PCM and observe the waveform on an oscilloscope while cranking
Repair or replace any faulty wiring, sensor, or reluctor wheel as needed
Clear codes and perform a road test to verify the repair

24X signal faults often misdiagnosed

A weak or failing ignition coil can introduce electrical noise into the 24X circuit, causing a low-frequency code without any sensor fault.
The 24X reluctor wheel is pressed onto the crankshaft and can slip or develop cracks that are invisible without removing the harmonic balancer.
Technicians sometimes replace the crankshaft position sensor only to find the connector pins are pushed back or corroded, so always perform a wiggle test.
This code can be set by a low battery or poor ground connection that causes the PCM to misinterpret the reference signal during cranking.
On some Chrysler engines, a failing camshaft position sensor can cause the PCM to default to a calculated 24X signal, setting P1323 as a secondary code.

Can I keep driving with P1323?

You can usually drive the vehicle to a repair shop if the engine runs smoothly, but avoid heavy acceleration or long trips because a sudden loss of the 24X signal can cause stalling or a no-start. If the engine is misfiring or stalling frequently, stop driving and have it towed to prevent safety risks.

Tools that help

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Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.