What Does P0323 Mean?
The ignition/distributor engine speed input circuit is exhibiting an intermittent signal. The PCM detects periodic dropouts or glitches in the engine speed signal that come and go. The driver may notice occasional tachometer needle drops, brief hesitations, or rare stalling events that seem to happen randomly and cannot be consistently reproduced.
Common Causes
30%
Loose or corroded CKP sensor connector that loses contact under vibration
25%
Cracked or chafed CKP sensor wiring with intermittent break
20%
CKP sensor beginning to fail with heat-related intermittent signal loss
15%
Loose CKP sensor mounting allowing vibration-induced air gap changes
10%
Intermittent short to ground in the signal wire caused by chafing against engine components
Diagnostic Steps
1
Perform an extended wiggle test on the CKP sensor connector and wiring while monitoring RPM live data — have an assistant wiggle the harness at multiple points while you watch for signal dropout.
2
Inspect the entire CKP sensor wire run from sensor to PCM for abrasion points, especially near the starter motor, exhaust manifold, and any sharp metal edges.
3
Check the CKP sensor connector for signs of heat damage, stretched terminals, or corrosion. Apply dielectric grease after cleaning to prevent future issues.
4
Monitor the engine speed signal with an oscilloscope while tapping on the CKP sensor with a plastic tool handle — a failing sensor may show momentary signal loss.
5
Verify the CKP sensor mounting bolt is tight and the sensor has not backed out of its bore. Apply threadlocker if the bolt shows signs of loosening.
Estimated Repair Cost
$75 - $400
Parts + labor, varies by vehicle and location
The ignition/distributor engine speed input circuit is exhibiting an intermittent signal. The PCM detects periodic dropouts or glitches in the engine speed signal that come and go. The driver may notice occasional tachometer needle drops, brief hesitations, or rare stalling events that seem to happe...
The most common cause of P0323 (Ignition/Distributor Engine Speed Input Circuit Intermittent) is: Loose or corroded CKP sensor connector that loses contact under vibration
Typical repair costs for P0323 range from $75 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent signal loss can cause unexpected stalling at any time, including highway speeds. While it may not happen frequently, the unpredictable nature makes it a safety concern. Have the intermittent connection repaired promptly to prevent a stall in dangerous conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0323 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System / Engine Management
Difficulty
Type
Generic (SAE)
Recommended Tools
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