Question 1

What does B1601 mean?

Accepted Answer

B1601 - PATS Received Incorrect Key Code. Ford PATS: Key transponder code doesn't match stored codes. Key not recognized.

Question 2

What are the symptoms of B1601?

Accepted Answer

Engine cranks but immediately dies, Anti-theft light solid or flashing, Starts with one key but not another

Question 3

What causes B1601?

Accepted Answer

Wrong key used, Key transponder failed, PATS module lost programming, Aftermarket key with wrong transponder

Question 4

How much does it cost to fix B1601?

Accepted Answer

Typical repair cost: $50-$300. If one key fails, that key's transponder may be dead. If no keys work, PATS module may have lost memory. ScanFixAI includes PATS key calculator.

B1601 — PATS Received Incorrect Key Code

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Common symptoms of B1601

Common causes of B1601

Repair cost & difficulty

Vehicles commonly affected

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