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DTC codes / Chrysler codes / P1354

P1354 · ChryslerIC Output High Pulse Detected When Grounded Cyl 4

P1354 on Chrysler vehicles means the engine computer detected an unexpected high voltage pulse on the ignition coil output circuit for cylinder 4 while that circuit was commanded to ground. The coil driver inside the computer or the wiring to the coil is not pulling the circuit low as expected, so the computer flags the cylinder 4 ignition output as faulty.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Symptoms you may notice

  • Illuminated check engine light, often with no other noticeable symptoms
  • Engine misfire or rough running, especially under load or at idle
  • Reduced engine power or limp mode in some Chrysler models
  • Shaking or vibration felt through the steering wheel or seat
  • Poor fuel economy or a strong fuel smell from the exhaust
  • Hard starting or intermittent stalling when the fault is active

Common causes, most likely first

  1. Faulty ignition coil on cylinder 4 with an internally shorted or open primary winding
  2. Damaged or chafed wiring between the powertrain control module (PCM) and the cylinder 4 coil
  3. Corroded or loose connector pins at the coil or PCM harness
  4. Failed ignition coil driver inside the PCM
  5. Aftermarket or incorrect coil with wrong primary resistance
  6. Moisture intrusion into the coil connector or spark plug well

How to diagnose and fix it

  1. Scan all modules for stored and pending codes, then record freeze-frame data for P1354
  2. Inspect the cylinder 4 coil connector and harness for corrosion, chafing, or loose pins
  3. Swap the cylinder 4 ignition coil with a known-good coil from another cylinder and recheck the code
  4. Measure primary and secondary resistance of the cylinder 4 coil and compare to specification
  5. Back-probe the coil control circuit at the PCM and check for a short to voltage or an open circuit
  6. Check the PCM ground and power feeds, then test the driver circuit with a noid light or oscilloscope
  7. Replace the faulty coil, repair the harness, or reprogram or replace the PCM as the final step

What the coil driver test really shows

  • A P1354 can set from a coil that tests fine cold but breaks down when hot, so always test the coil after a road test that reproduces the misfire.
  • The code name refers to the computer's internal driver, but the most common real-world cause is still the coil or its connector, not the PCM itself.
  • Chrysler PCMs are sensitive to aftermarket coils with incorrect resistance, and a new but wrong-spec coil can set P1354 immediately after installation.
  • A shorted coil on cylinder 4 can damage the PCM driver over time, so replacing only the coil without checking the driver circuit risks a repeat failure.
  • P1354 often appears alongside misfire codes for cylinder 4, and diagnosing only the misfire without checking the coil control circuit can lead to unnecessary spark plug or injector replacement.

Can I keep driving with P1354?

You can usually drive a short distance to a repair shop, but avoid heavy acceleration and long trips because a persistent misfire can overheat the catalytic converter and waste fuel. If the engine is shaking badly or flashing the check engine light, stop driving and have it 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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