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DTC codes / Chrysler codes / P1365

P1365 · ChryslerIC Cylinder 5 Not Toggling After Enable

P1365 on Chrysler vehicles means the powertrain control module (PCM) has commanded the ignition coil for cylinder 5 to fire, but the coil's feedback circuit is not toggling as expected. The PCM monitors the coil primary circuit for a switching signal after enable, and when that signal stays static, it flags this code and often disables the affected cylinder's fuel delivery to protect the catalytic converter.

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 at first
  • Rough idle or misfire sensation, especially when the engine is cold or under light load
  • Noticeable loss of power and reduced fuel economy due to a dead cylinder
  • Shaking or vibration through the steering wheel and floorboard that worsens with engine speed
  • A flashing check engine light if the misfire becomes severe enough to damage the catalytic converter
  • Possible rotten egg smell from the exhaust if unburned fuel reaches the converter

Common causes, most likely first

  1. Failed ignition coil on cylinder 5, where the primary winding or internal driver no longer toggles
  2. Damaged or chafed wiring in the coil control circuit between the PCM and the cylinder 5 coil connector
  3. Corroded, loose, or pushed-back terminals at the cylinder 5 coil connector or the PCM harness
  4. Open or shorted feedback circuit that prevents the PCM from seeing the coil toggle after enable
  5. Faulty powertrain control module driver for the cylinder 5 coil control circuit
  6. A spark plug that is severely fouled or gapped incorrectly, overloading the coil and masking the toggle signal
  7. Moisture intrusion into the coil-on-plug boot or connector causing intermittent signal loss

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data to confirm P1365 is active and not a history code from a past repair
  2. Inspect the cylinder 5 ignition coil connector and harness for corrosion, chafing, or loose pins, and repair as needed
  3. Swap the cylinder 5 coil with a known-good coil from another cylinder and see if the code follows the coil
  4. Use a noid light or oscilloscope on the coil control circuit to verify the PCM is commanding a toggle signal after enable
  5. Check the feedback circuit for continuity and shorts to ground or power, comparing readings to the other coil circuits
  6. Replace the cylinder 5 ignition coil and spark plug if the coil is confirmed faulty, then clear codes and verify the monitor runs
  7. If the control circuit is good but the PCM driver is dead, replace or reprogram the PCM and perform a relearn procedure

Why cylinder 5 coil codes mislead technicians

  • A coil that fires fine at idle can still fail the toggle monitor because the PCM checks the feedback signal immediately after enable, so a coil with a lazy driver may pass a basic spark test but still set P1365.
  • Technicians often replace the coil only to find a chafed wire in the harness near the valve cover, so always wiggle-test the harness while watching live misfire counters before condemning parts.
  • This code can be set by a completely dead cylinder 5 coil, but it also appears when the coil is unplugged during a compression test and the technician forgets to clear the code afterward.
  • On some Chrysler engines, a failing spark plug tube seal allows oil to fill the coil boot, which corrupts the feedback signal and sets P1365 without any visible harness damage.
  • P1365 is often accompanied by a general misfire code for cylinder 5, but the toggle code specifically points to the coil control circuit rather than fuel or compression, so do not chase injectors first.

Can I keep driving with P1365?

You can drive short distances to a repair shop, but avoid heavy acceleration and long trips because raw fuel from the dead cylinder can overheat and destroy the catalytic converter. If the check engine light is flashing, stop driving and have the vehicle towed.

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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