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
To diagnose B1601, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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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.