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P1356 Mercury Code - Loss Of Ignition Diagnostic Module Input To PCM

Quick Answer

The P1356 diagnostic trouble code (DTC) for Mercury vehicles indicates a loss of ignition diagnostic module input to the powertrain control module (PCM). Common causes include Faulty ignition module: The ignition module itself may be malfunctioning, causing a loss of input to the PCM, Wiring issues: Damaged or loose wiring connections between the ignition module and PCM can disrupt the signal transmission, Faulty PCM: A problem with the PCM itself can prevent it from receiving the necessary input from the ignition module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1356 Mercury indicates Loss Of Ignition Diagnostic Module Input To PCM.
Common causes
Common causes include Faulty ignition module: The ignition module itself may be malfunctioning, causing a loss of input to the PCM, Wiring issues: Damaged or loose wiring connections between the ignition module and PCM can disrupt the signal transmission, Faulty PCM: A problem with the PCM itself can prevent it from receiving the necessary input from the ignition module.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1356 Mercury Description

The P1356 diagnostic trouble code (DTC) for Mercury vehicles indicates a loss of ignition diagnostic module input to the powertrain control module (PCM). This means that the PCM is not receiving the necessary information from the ignition system, which can lead to various performance issues.

OBDII Code P1356 Mercury - Loss Of Ignition Diagnostic Module Input To PCM
P1356 Mercury Code - Loss Of Ignition Diagnostic Module Input To PCM

Common Causes of P1356 Mercury

  1. Faulty ignition module: The ignition module itself may be malfunctioning, causing a loss of input to the PCM.
  2. Wiring issues: Damaged or loose wiring connections between the ignition module and PCM can disrupt the signal transmission.
  3. Faulty PCM: A problem with the PCM itself can prevent it from receiving the necessary input from the ignition module.
  4. Ignition system malfunctions: Issues with the ignition coil, spark plugs, or other components can impact the ignition module's ability to provide accurate data to the PCM.
  5. Electrical issues: Problems with the vehicle's electrical system, such as a dead battery or alternator issues, can also affect the ignition module's operation.

Symptoms of P1356 Mercury

  1. Engine misfires: Due to the lack of accurate ignition timing information, the engine may misfire, causing rough idling and poor acceleration.
  2. Decreased fuel efficiency: Without proper ignition module input, the engine may not operate efficiently, leading to increased fuel consumption.
  3. Difficulty starting: The vehicle may have trouble starting or may require multiple attempts to start the engine.
  4. Illuminated Check Engine Light: The PCM detects the issue with the ignition module input and triggers the Check Engine Light to alert the driver to a problem.
  5. Engine performance issues: The vehicle may experience a lack of power, hesitation, or surging while driving due to the incorrect ignition timing.

How to Fix P1356 Mercury

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the ignition module, wiring, and related components.
  2. Test the ignition module: Check the ignition module for proper operation using a multimeter to ensure it is sending the correct signals to the PCM.
  3. Inspect wiring connections: Check all wiring connections for damage, corrosion, or looseness and repair or replace as needed.
  4. Replace faulty components: If the ignition module or any other components are found to be faulty, replace them with new, quality parts.
  5. Clear the trouble code: Once the repairs are completed, use a scanner to clear the trouble code from the PCM and test drive the vehicle to ensure the issue is resolved.

Cost to Fix P1356 Mercury

The cost of repairing a P1356 code on a Mercury vehicle can vary depending on the specific cause of the issue and the labor rates in your area. In general, the cost of parts for this repair can range from $100 to $300, with labor costs adding an additional $100 to $200. Overall, you can expect to pay between $200 and $500 for a professional repair at an auto repair shop.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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