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DTC codes / Chrysler codes / P1364

P1364 · ChryslerIC Cylinder 4 Not Toggling After Enable

P1364 on Chrysler vehicles means the powertrain control module (PCM) commanded the ignition coil for cylinder 4 to fire, but the coil's feedback circuit never confirmed the switching event within the expected window. The PCM monitors the coil primary control line for a voltage toggle after enable, and a missing toggle sets this code because the driver circuit or coil is not responding to the command.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Symptoms you may notice

  • Illumination of the check engine light, often with no other symptoms noticed by the driver
  • A noticeable misfire or rough idle that may be intermittent rather than constant
  • Reduced engine power or a hesitation during acceleration when cylinder 4 drops out
  • A flashing check engine light under load if the misfire is severe enough to threaten the catalytic converter
  • Slightly rough cold-start behavior or a stumble just after engine start-up
  • No drivability change at all in many cases, because the fault may be in the feedback circuit rather than the coil itself

Common causes, most likely first

  1. Faulty ignition coil on cylinder 4 with an open or shorted primary winding
  2. Damaged or corroded connector at the cylinder 4 coil, including backed-out terminals
  3. Open or chafed wire in the coil control circuit between the PCM and the cylinder 4 coil
  4. Failed ignition coil driver inside the PCM, though this is less common than coil or wiring faults
  5. Poor ground connection shared by the coil circuit, causing the feedback signal to be lost
  6. Aftermarket coil with incorrect internal feedback circuitry that does not toggle as the PCM expects

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data for P1364 to confirm the fault was set at operating temperature and under load
  2. Inspect the cylinder 4 coil connector and harness for corrosion, loose pins, or chafing, and repair as needed
  3. Swap the cylinder 4 coil with a known-good coil from another cylinder and see whether the code follows the coil
  4. Use a lab scope or a noid light on the coil control circuit to verify the PCM command and the feedback toggle
  5. Check resistance of the cylinder 4 coil primary and secondary windings against the manufacturer's specification
  6. Verify the ground circuit for the coil and PCM with a voltage drop test under load
  7. If the command is present but the feedback never toggles with a known-good coil and clean wiring, test or replace the PCM

Why the coil may not be the culprit

  • A missing toggle on the feedback line often points to a wiring or connector problem rather than a failed coil, so swapping the coil first can send you down the wrong path.
  • The PCM expects a specific voltage swing on the control circuit, and a partially shorted coil can still fire the cylinder while failing the toggle test, producing this code with no misfire felt by the driver.
  • Aftermarket coils are a frequent cause on Chrysler engines because some do not reproduce the factory feedback signal, so a new coil can set P1364 even though it sparks fine.
  • Corrosion inside the coil boot or at the connector can interrupt the feedback circuit without affecting spark delivery, which is why a visual inspection of the terminals matters as much as a coil swap.
  • A weak battery or charging system that drops voltage during cranking can cause the PCM to miss the toggle window and store P1364 intermittently, so check system voltage before condemning the coil.

Can I keep driving with P1364?

You can usually drive with P1364 if the engine runs smoothly and the light is steady, but avoid heavy acceleration and long uphill loads until it is diagnosed. If the check engine light flashes or the engine misfires noticeably, stop driving and repair the fault to protect the catalytic converter.

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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