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P1636 Ford Code - Inductive Signature Chip Communication Error

Quick Answer

The P1636 Ford diagnostic trouble code refers to an Inductive Signature Chip Communication Error. Common causes include Faulty Inductive Signature Chip in the key, Wiring issues between the key and the PCM, Faulty PCM. 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 Ford indicates Inductive Signature Chip Communication Error.
Common causes
Common causes include Faulty Inductive Signature Chip in the key, Wiring issues between the key and the PCM, Faulty PCM.
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 07, 2024
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Code P1636 Ford Description

The P1636 Ford diagnostic trouble code refers to an Inductive Signature Chip Communication Error. This error occurs when there is a communication problem between the PCM (Powertrain Control Module) and the Inductive Signature Chip. The Inductive Signature Chip is a security feature used by Ford vehicles to prevent theft by ensuring that the correct key is being used to start the vehicle. When this communication error occurs, it can lead to issues with the vehicle's starting system, as the PCM may not recognize the key being used, causing the vehicle to not start or stall unexpectedly.

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

Common Causes of P1636 Ford

  1. Faulty Inductive Signature Chip in the key
  2. Wiring issues between the key and the PCM
  3. Faulty PCM
  4. Electrical interference affecting the communication between the key and the PCM
  5. Issues with the vehicle's anti-theft system

Symptoms of P1636 Ford

  1. Engine stalling or failure to start
  2. Check Engine Light illuminated on the dashboard
  3. Key not recognized by the vehicle's ignition system
  4. Vehicle going into "security mode" and not starting

How to Fix P1636 Ford

  1. Verify the issue by using a diagnostic scanner to read the P1636 code and confirm the communication error.
  2. Inspect the key's Inductive Signature Chip for any damage or malfunction. Replace the key if necessary.
  3. Check the wiring between the key and the PCM for any breaks, frays, or loose connections. Repair or replace any damaged wiring.
  4. If the issue persists, have the PCM inspected by a qualified technician. Replace the PCM if necessary.
  5. Clear the code from the PCM's memory and test the vehicle to ensure the issue has been resolved.

Cost to Fix P1636 Ford

The cost of repairing a P1636 Ford code can vary depending on the specific cause of the issue. In general, the cost of replacing a key with a faulty Inductive Signature Chip can range from $50 to $200. If the issue is related to wiring or the PCM, the cost can increase significantly, potentially ranging from $200 to $1000 or more. Labor costs can also vary, with rates typically ranging from $80 to $150 per hour. It is advisable to consult with a trusted auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle in question.

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Information for Specific Ford Models

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 Ford Code

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  • my 2011 f150 wont start. just keeps cranking over but wont fire. ran fine yesterday. check engine light came on for P1636 which is the PCM. do i need to replace the whole computer or just one of those 3 plugs that plug into it. already checked all the fuses and the relay

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  • Let me check if there is more information about that code. What is the engine size of your F150?

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  • Ford Ranger 2.2 2014 wont start. just keeps cranking over but wont fire check engine light came on for P1636 and telling Crankshaft Position Sensor...Where is it located?

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