01 Tech Behind Autonomous Cars: Sensors, AI, and Self-Driving … • 02 This Is Why You’ll Want an Electric Car by 2030 • 03 Why Does Your Car Shake When Braking at High Speeds? • 04 Engineers Created Paint That Can Literally Generate Electri… • 05 Engineering Safety Matters: Promoting a Culture of Safety i… • 06 Most Owners Don’t Realize Their Infotainment Screens Are Se… • 07 Beyond the Tailpipe: Understanding the Characteristics of E… • 08 10 Crucial Insights into Oxygen Sensors, Common Problems, a… • 09 Troubleshooting Black Smoke: Diagnosing Fuel-to-Air Issues … • 10 What should I do if my manual transmission is slipping or p… •

DTC codes / Chrysler codes / P1357

P1357 · ChryslerIC Output High Pulse Detected When Grounded Cyl 7

P1357 on Chrysler vehicles means the engine computer detected an unexpected high voltage on the ignition coil control circuit for cylinder 7 when that circuit was commanded to ground. The computer tried to fire the coil by pulling the control wire low, but the wire stayed high, so the coil never received a proper firing signal.

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
  • Rough idle or a noticeable miss at idle that may smooth out at higher rpm
  • Reduced engine power or sluggish acceleration under load
  • Shaking or vibration from the engine bay, especially when cold
  • Worse fuel economy than normal for your driving routine
  • A flashing check engine light if the misfire becomes severe enough to damage the catalytic converter

Common causes, most likely first

  1. Open or damaged wire in the cylinder 7 coil control circuit between the powertrain control module and the coil
  2. Failed ignition coil on cylinder 7 with an internal open control circuit
  3. Corroded or loose connector pins at the coil or at the powertrain control module
  4. Short to voltage on the coil control wire from chafing against a hot or moving component
  5. Failed driver inside the powertrain control module for that specific coil circuit
  6. Poor engine ground or harness ground near the coil circuit affecting signal integrity
  7. Aftermarket alarm or remote start wiring tapped into the coil harness incorrectly

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data to confirm P1357 is active and not a history code from a previous repair
  2. Inspect the cylinder 7 ignition coil connector and the powertrain control module connector for corrosion, pushed pins, or loose terminals
  3. Measure resistance of the coil control wire from the powertrain control module to the coil while wiggling the harness to find an intermittent open
  4. Check for short to voltage on the control wire with the key on and the computer disconnected, looking for battery voltage where it should not be
  5. Swap the cylinder 7 coil with a known-good coil from another cylinder and see if the code follows the coil or stays with cylinder 7
  6. Back-probe the control circuit with a lab scope or logic probe to verify the computer is actually pulling the circuit low when commanded
  7. If the circuit and coil test good but the computer never grounds the wire, diagnose the powertrain control module driver or replace the module after confirming powers and grounds

Why cylinder 7 coil codes mislead

  • A coil that ohms out perfectly on the bench can still set P1357 because the fault is in the control circuit inside the coil or in the wiring, not in the coil windings themselves.
  • Technicians often replace the cylinder 7 coil first and the code returns because the real problem is a chafed control wire near the valve cover or a corroded pin at the powertrain control module.
  • P1357 can be stored by a weak engine ground that raises the reference voltage on the control circuit, so always check grounds before condemning the computer.
  • A misfire counter that never increments on cylinder 7 does not rule out P1357, because this code is about the control circuit electrical state, not necessarily a detected combustion misfire.
  • Aftermarket remote start or alarm installers sometimes tap the coil harness for a tach signal and leave a short to voltage that sets this code only under certain key cycles.

Can I keep driving with P1357?

You can usually drive short distances to a repair shop, but avoid heavy acceleration and towing because a dead cylinder 7 can overheat the catalytic converter. If the check engine light flashes, 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.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage