Car X-ray visualization

What does Error Code P0354 mean?

Moderate Issue
DTC Code P0354 indicates an issue with the Ignition Coil 4 Control Circuit, where the ECM's command state does not align with the actual state, affecting the spark event for cylinder 4.

What are the symptoms of Error Code P0354?

  • Engine Light ON: The check engine light or service engine soon warning light illuminates, indicating an issue with the ignition coil 4 control circuit.
  • Lack/Loss of Power: The vehicle may experience a noticeable reduction in power, which can be linked to the malfunctioning ignition coil affecting engine performance.
  • Harder Engine Start: The engine may be more difficult to start, potentially due to the ignition coil not providing adequate spark to ignite the air-fuel mixture.
  • Engine Hesitation: There may be a delay or hesitation in engine response, often caused by inconsistent spark delivery from the faulty ignition coil.
  • Rough Engine Idle: The engine may idle roughly, which can be attributed to misfires or incomplete combustion resulting from the ignition coil issue.

What causes Error Code P0354?

  • The ignition coil 4 may be malfunctioning, leading to improper spark generation and engine misfires.
  • An open or shorted harness in ignition coil 4 can disrupt the electrical flow, causing the control circuit to fail.
  • Poor electrical connections in the ignition coil 4 circuit can result in intermittent or weak signals, affecting engine performance.
  • A faulty Engine Control Module (ECM) can misinterpret or fail to send the correct signals to ignition coil 4, leading to control circuit issues.
MechanX

Find the Root Cause with AI

Analyze symptoms and error codes with artificial intelligence for a precise diagnosis

Fast Diagnosis in under 3 minutes
Precise AI-powered analysis
Free No hidden fees
Data-Driven Over 40,000 reference cases

How to fix Error Code P0354?

  • Initial Inspection: Inspect the ignition coil and its connections for any visible damage or corrosion. Ensure that the coil is securely mounted and that all electrical connectors are properly seated.
  • Check Power Supply: Using a multimeter, verify that the ignition coil is receiving the correct voltage from the battery. Check the power supply circuit for any blown fuses or damaged wiring.
  • Test Ignition Coil: Perform a resistance test on the ignition coil using an ohmmeter. Compare the readings with the manufacturer's specifications to determine if the coil is functioning correctly.
  • Inspect Control Circuit: Examine the control circuit wiring for any signs of wear, damage, or disconnection. Ensure that the wiring harness is intact and properly connected to the engine control module (ECM).
  • ECM Functionality Check: Use a diagnostic scanner to check for any additional codes that may indicate a problem with the ECM. Ensure that the ECM is sending the correct signals to the ignition coil.
  • Swap Test: If the issue persists, swap the ignition coil with another cylinder's coil to see if the problem follows the coil. This can help determine if the coil itself is faulty.
MechanX