B1601 on 2007-2017 Lexus LS (LS460, LS460L, LS600h, LS600hL) — PATS Received Incorrect Key-Code From Transponder
1 vehicles · 1 makes · $400-$1,500 repair
Most Reported On
B1601 is an OBD-II diagnostic trouble code meaning “PATS Received Incorrect Key-Code From Transponder.” B1601 is a Ford/Lincoln/Mazda body code indicating the Passive Anti-Theft System (PATS) received an incorrect or unrecognized key-code from the ignition key transponder. The anti-theft module could not validate the key, so it may prevent the engine from starting (no-start) and the theft/security light typically flashes. It is not a mechanical engine fault but a security/authentication issue between the key and the immobilizer. Resolving it usually involves key relearning or addressing transponder/wiring faults. This code is most commonly reported on 2007-2017 Lexus LS (LS460, LS460L, LS600h, LS600hL), with repair costs ranging from $400 to $1,500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
B1601 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does B1601 mean?
B1601 stands for "PATS Received Incorrect Key-Code From Transponder." B1601 is a Ford/Lincoln/Mazda body code indicating the Passive Anti-Theft System (PATS) received an incorrect or unrecognized key-code from the ignition key transponder. The anti-theft module could not validate the key, so it may prevent the engine from starting (no-start) and the theft/security light typically flashes. It is not a mechanical engine fault but a security/authentication issue between the key and the immobilizer. Resolving it usually involves key relearning or addressing transponder/wiring faults.
What are the most common causes of B1601?
The most common causes of B1601 are: Unprogrammed, damaged, or wrong transponder key, Key not properly learned to the vehicle, Faulty or weak transponder/key chip, Faulty PATS transceiver ring at the ignition, Damaged wiring/connector between transceiver and module, Faulty PATS/anti-theft control module. The specific cause varies by vehicle.
How much does it cost to fix B1601?
Repair costs for B1601 range from $400 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by B1601?
Au7o has documented B1601 across 1 vehicle models from 1 manufacturers: Lexus.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.