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DTC codes / Jaguar codes / P1364

P1364 · JaguarIgnition Coil Cylinder 4 No Activation

P1364 on a Jaguar means the engine control module (ECM) commanded the ignition coil for cylinder 4 to fire but detected no electrical activation or feedback from that coil circuit. The ECM monitors the coil primary circuit and flags this code when the expected current pulse or confirmation signal is missing, indicating an open circuit, short, or failed coil.

SystemPowertrain
Code typeJaguar specific
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Symptoms you may notice

  • Engine misfire felt as a shake or stumble, especially under acceleration or load
  • Rough idle with noticeable vibration through the steering wheel or seat
  • Check engine light illuminated, sometimes flashing if the misfire is severe
  • Reduced power and poor fuel economy due to a dead cylinder
  • Often no symptoms besides the warning light if the misfire is mild or intermittent
  • Possible rotten egg smell from unburned fuel reaching the catalytic converter

Common causes, most likely first

  1. Faulty ignition coil on cylinder 4 (open or shorted primary winding)
  2. Damaged or corroded electrical connector at the cylinder 4 coil
  3. Broken, chafed, or open wire in the coil trigger or ground circuit
  4. Failed ignition coil driver inside the ECM (less common but possible)
  5. Contamination or oil intrusion into the coil boot causing a short
  6. Loose or backed-out coil mounting bolt affecting the ground path

How to diagnose and fix it

  1. Scan all modules for stored and pending codes, then clear and road-test to confirm P1364 returns
  2. Inspect the cylinder 4 coil connector and wiring for corrosion, looseness, or chafing
  3. Swap the cylinder 4 coil with a known-good coil from another cylinder and see if the misfire moves
  4. Measure resistance across the coil primary and secondary windings and compare with a good coil
  5. Check for battery voltage at the coil connector with the key on and verify the ground circuit
  6. Perform a spark test or use an oscilloscope to confirm the trigger signal from the ECM
  7. If wiring and signal are good, replace the cylinder 4 ignition coil and re-test

What a coil swap really tells you

  • Swapping coils is the fastest diagnostic step, but if the misfire stays on cylinder 4 after the swap, the fault is in the wiring or the ECM driver, not the coil itself.
  • A coil can pass a resistance test and still fail under load, so a spark tester or oscilloscope check under cranking is more reliable than a multimeter alone.
  • Oil leaking past the cam cover gasket into the spark plug well is a common Jaguar issue that shorts the coil boot and sets this code without any wiring fault.
  • P1364 can be stored intermittently by a loose coil connector that only loses contact over bumps, so wiggle-test the harness while the engine idles.
  • Do not overlook the coil ground path; a corroded mounting bolt or painted bracket can cause no-activation codes even with a healthy coil.

Can I keep driving with P1364?

You can drive cautiously to a repair shop if the misfire is mild and the check engine light is steady, but avoid hard acceleration and heavy loads. If the light flashes or the engine shakes badly, stop driving because raw fuel can overheat and destroy 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 Jaguar vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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