Powertrain, generic · Ignition system or misfire

P0323 Ignition/Distributor Engine Speed Input Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P0323 stands for a speed and reference signal at the ignition input – today the crankshaft position sensor – that drops out or is disturbed for moments and then recovers. None of the manufacturer documents available to us (GM 2014–2019, Ford 2012 and 2020–2023, Saab workshop information) uses P0323; the sporadic crank sensor check runs under P0339 at Ford and under P0336 at GM. Ford's logic shows what is evaluated: teeth missing or extra for a moment and the reference gap appearing at an unexpected position, after which the module briefly cuts fuel and spark and resynchronises. Typical causes are a loose contact, chafed wiring and electrical interference. The code itself is described only by its J2012 name and CARB's monitoring requirement for crank angle sensors.

Likely causes

Loose contact or corrosion at the sensor connector
Chafed wiring, break under vibration
Sensor dropping out when hot
Interference from neighbouring wires

Symptoms

  • Brief stumbling or stalling, then normal again
  • Sporadic misfire
  • Tachometer flickers
  • Check engine light on

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–300
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

crankshaft position sensorcrankshaft tone wheelsensor wiringengine control module

Related codes

P0320P0321P0322P0339

References: newtonnet.co.uk, fordservicecontent.com, law.cornell.edu.