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DTC codes / Chrysler codes / P1374

P1374 · Chrysler3X Reference Circuit

P1374 on Chrysler vehicles means the powertrain control module (PCM) is not receiving a valid 3X reference signal from the ignition system, which is the crankshaft position sensor's high-resolution pulse train used for precise ignition and fuel timing. The PCM sets this code when the 3X signal is missing, intermittent, or electrically distorted while the engine is running or cranking.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyProfessional
AreaIgnition system and misfire

Symptoms you may notice

  • Engine may crank but not start, or start and stall immediately
  • Intermittent misfire or rough running, especially under load or at higher RPM
  • Sudden loss of power or hesitation during acceleration
  • The engine may run in limp mode with limited RPM
  • Often no symptoms besides the warning light if the fault is intermittent
  • Tachometer may drop to zero or fluctuate erratically while driving

Common causes, most likely first

  1. Faulty crankshaft position sensor or damaged sensor reluctor wheel
  2. Wiring harness damage between the crankshaft sensor and PCM (chafed, corroded, or open circuit)
  3. Poor electrical connection at the crankshaft sensor or PCM connector
  4. Failed PCM driver circuit for the 3X reference signal
  5. Ignition system interference or a failing ignition coil pack feeding noise into the reference circuit
  6. Damaged or misrouted harness near hot exhaust components causing intermittent shorts

How to diagnose and fix it

  1. Scan all modules for stored and pending codes, and record freeze-frame data to see when P1374 set
  2. Inspect the crankshaft position sensor connector and wiring for corrosion, chafing, or loose pins
  3. Check the sensor air gap and reluctor wheel condition if accessible without major disassembly
  4. Measure the 3X reference signal with an oscilloscope at the PCM while cranking or running to confirm presence and shape
  5. Perform a voltage drop test on the sensor ground and power circuits to rule out resistance issues
  6. Substitute a known-good crankshaft position sensor and clear codes to see if the fault returns
  7. If the signal is good at the sensor but missing at the PCM, trace the harness and repair any opens or shorts

Why the 3X signal fails without a crank sensor code

  • A failing ignition coil or spark plug wire can induce electrical noise into the 3X reference circuit, causing P1374 without any crankshaft sensor fault code stored.
  • The 3X reference signal is separate from the 24X or 58X crankshaft signals on some Chrysler engines, so a good cam or crank signal does not guarantee the 3X circuit is healthy.
  • Intermittent P1374 often appears only when the engine bay is hot, because a failing sensor or chafed wire expands and loses contact at operating temperature.
  • A weak battery or poor engine ground can cause the PCM to misread the 3X signal, so always verify charging system and ground integrity before replacing parts.
  • Technicians sometimes replace the crankshaft sensor only to find the reluctor wheel has a cracked or missing tooth, which produces a distorted 3X pattern that a basic scan tool cannot reveal.

Can I keep driving with P1374?

If the engine starts and runs without stalling, you can drive cautiously to a repair shop, but avoid heavy acceleration and high RPM. If the engine stalls or will not start, do not drive because the fault can leave you stranded or cause a no-start condition.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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