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DTC codes / Chrysler codes / P1356

P1356 · ChryslerIC Output High Pulse Detected When Grounded Cyl 6

P1356 on Chrysler vehicles means the powertrain control module (PCM) commanded the ignition coil for cylinder 6 to fire, but it detected a high-voltage pulse on the coil control circuit when that circuit was supposed to be grounded. The computer saw an unexpected electrical spike on the cylinder 6 coil driver circuit during the dwell period, indicating a fault in the coil, wiring, or PCM driver.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Symptoms you may notice

  • Check engine light (malfunction indicator lamp) illuminated, often with no other symptoms
  • Rough idle or misfire felt as a shake or stumble, especially when the engine is cold
  • Reduced engine power or hesitation during acceleration
  • Increased fuel consumption due to incomplete combustion
  • Possible flashing check engine light if the misfire is severe enough to damage the catalytic converter
  • In some cases, the engine may stall or be hard to start

Common causes, most likely first

  1. Faulty ignition coil on cylinder 6 (internal short or open in the primary winding)
  2. Damaged or chafed wiring in the coil control circuit between the PCM and the coil
  3. Corroded or loose electrical connector at the cylinder 6 ignition coil
  4. Failed PCM driver for the cylinder 6 coil control circuit (rare but possible)
  5. Electrical interference from a nearby component, such as a failing spark plug wire or alternator
  6. Poor engine ground connection causing voltage spikes on the coil control circuit

How to diagnose and fix it

  1. Inspect the cylinder 6 ignition coil connector and wiring for corrosion, chafing, or loose pins; repair as needed
  2. Swap the cylinder 6 ignition coil with a known-good coil from another cylinder and see if the code moves to that cylinder
  3. Use a digital multimeter to check the resistance of the cylinder 6 coil primary and secondary windings against factory specifications
  4. Check for voltage spikes or abnormal signals on the coil control circuit using an oscilloscope while cranking or running the engine
  5. Verify the integrity of the engine ground straps and battery connections, cleaning and tightening as necessary
  6. If all external components test good, suspect the PCM and perform a driver circuit test or substitute with a known-good PCM for diagnosis
  7. After repairs, clear the code and perform a road test to confirm the fault does not return

Don't overlook the coil driver circuit

  • A high pulse on a grounded circuit often points to an induced voltage spike from a failing spark plug or coil boot, which can mimic a coil failure without the coil being defective.
  • The code can be set intermittently by a loose ground connection at the engine block, so always check ground straps before condemning the PCM.
  • Swapping coils is a quick diagnostic step, but if the code stays on cylinder 6, the problem is almost always in the wiring or PCM driver, not the coil itself.
  • Some aftermarket ignition coils have different electrical characteristics that can trigger this code even when they function, so stick with OEM-quality replacements.
  • A failing camshaft or crankshaft sensor can cause timing errors that lead to false cylinder 6 coil codes, so check for related codes before replacing parts.

Can I keep driving with P1356?

You can usually drive with P1356, but avoid heavy acceleration and long trips until it is diagnosed, because a persistent misfire can overheat and damage the catalytic converter. If the check engine light is flashing, stop driving and have the vehicle towed to a repair shop.

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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