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P1636 2009 Ford Fusion Code - Inductive Signature Chip Communication Error

Quick Answer

The P1636 diagnostic trouble code (DTC) for a 2009 Ford Fusion indicates an Inductive Signature Chip Communication Error. Common causes include Faulty Inductive Signature Chip, Wiring issues between the Inductive Signature Chip and ECM, ECM software malfunction. 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
P1636 2009 Ford Fusion indicates Inductive Signature Chip Communication Error.
Common causes
Common causes include Faulty Inductive Signature Chip, Wiring issues between the Inductive Signature Chip and ECM, ECM software malfunction.
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 14, 2024
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Code P1636 2009 Ford Fusion Description

The P1636 diagnostic trouble code (DTC) for a 2009 Ford Fusion indicates an Inductive Signature Chip Communication Error. This error typically occurs when there is a communication problem between the vehicle's Engine Control Module (ECM) and the Inductive Signature Chip, which is a security feature designed to prevent unauthorized starting of the vehicle. The Inductive Signature Chip is a small electronic device that is embedded in the key or key fob and communicates with the ECM to allow the vehicle to start. When there is a communication error between the two, the vehicle may not start or may experience other performance issues.

OBDII Code P1636 2009 Ford Fusion - Inductive Signature Chip Communication Error
P1636 2009 Ford Fusion Code - Inductive Signature Chip Communication Error

Common Causes of P1636 2009 Ford Fusion

  1. Faulty Inductive Signature Chip
  2. Wiring issues between the Inductive Signature Chip and ECM
  3. ECM software malfunction
  4. Faulty ECM
  5. Poor connection between the Inductive Signature Chip and ECM

Symptoms of P1636 2009 Ford Fusion

  1. Engine cranks but does not start
  2. Engine starts and then stalls immediately
  3. Loss of power while driving
  4. Illumination of the Check Engine Light
  5. Difficulty starting the vehicle intermittently

How to Fix P1636 2009 Ford Fusion

  1. Begin by checking the wiring connections between the Inductive Signature Chip and ECM for any signs of damage or corrosion. Repair or replace any damaged wiring.
  2. Test the Inductive Signature Chip with a diagnostic tool to ensure it is functioning properly. Replace the chip if necessary.
  3. Check the ECM for any software updates or malfunctions. Update the software or replace the ECM if needed.
  4. Reset the ECM by disconnecting the battery for a few minutes and then reconnecting it to clear the code.
  5. Test the vehicle to ensure the issue has been resolved and the code does not return.

Cost to Fix P1636 2009 Ford Fusion

The typical repair costs for addressing a P1636 code on a 2009 Ford Fusion can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor in your area. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower prices.

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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.

Frequently Asked Questions about P1636 2009 Ford Fusion Code

1. What does the OBDII code P1636 mean on a 2009 Ford Fusion?

P1636 indicates an "Inductive Signature Chip Communication Error," which refers to a failure in communication between the PCM (Powertrain Control Module) and the Inductive Signature Chip, responsible for ignition coil management.

2. What are the common symptoms of a P1636 code on a 2009 Ford Fusion?

Symptoms may include the check engine light turning on, engine misfires, rough idling, difficulty starting the engine, and a potential loss of power.

3. What causes the P1636 code to appear on a 2009 Ford Fusion?

The code can be caused by a faulty inductive signature chip, wiring or connector issues, a malfunctioning PCM, or electrical interference affecting communication.

4. Can I drive my 2009 Ford Fusion with a P1636 code?

Driving with this code is not recommended, as it can cause misfires and potentially damage the engine or catalytic converter over time.

5. How do I diagnose a P1636 code on a 2009 Ford Fusion?

Start by inspecting the wiring and connectors between the inductive signature chip and the PCM for damage or corrosion. Use a scan tool to check for additional codes and verify communication between components.

6. How is the P1636 code fixed on a 2009 Ford Fusion?

Repairs may include replacing a faulty inductive signature chip, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. How much does it cost to repair a P1636 code on a 2009 Ford Fusion?

The repair cost depends on the specific issue. Wiring repairs may cost $100-$200, while PCM replacement can range from $500-$1,000, including parts and labor.

8. Can a weak battery cause a P1636 code on a 2009 Ford Fusion?

Yes, a weak or failing battery can disrupt communication between the PCM and the inductive signature chip, potentially triggering the P1636 code.

9. Is the P1636 code common in Ford vehicles?

While not extremely common, the P1636 code can occur in Ford vehicles, particularly when there are wiring or PCM-related issues.

10. Can clearing the code fix the P1636 issue on a 2009 Ford Fusion?

Clearing the code may temporarily turn off the check engine light, but it won't resolve the underlying problem. Proper diagnostics and repairs are necessary to fix the issue.

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