B1602 on 2007-2017 Lexus LS (LS460, LS460L, LS600h, LS600hL) — PATS Received Invalid Format of Key-Code From Ignition Key Transponder
1 vehicles · 1 makes · $400-$1,500 repair
Most Reported On
B1602 is an OBD-II diagnostic trouble code meaning “PATS Received Invalid Format of Key-Code From Ignition Key Transponder.” This is a Ford-family body code from the Passive Anti-Theft System (PATS), the immobilizer that verifies your key before allowing the engine to start. The module read the transponder chip in the key but received a code in an invalid or unrecognized format, so it could not confirm the key is authorized. The result is often a no-start or stall condition with the security/theft light illuminated. It usually points to a key, transponder, or anti-theft antenna problem rather than an engine fault. 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 B1602, 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 B1602 mean?
B1602 stands for "PATS Received Invalid Format of Key-Code From Ignition Key Transponder." This is a Ford-family body code from the Passive Anti-Theft System (PATS), the immobilizer that verifies your key before allowing the engine to start. The module read the transponder chip in the key but received a code in an invalid or unrecognized format, so it could not confirm the key is authorized. The result is often a no-start or stall condition with the security/theft light illuminated. It usually points to a key, transponder, or anti-theft antenna problem rather than an engine fault.
What are the most common causes of B1602?
The most common causes of B1602 are: Damaged, demagnetized, or non-programmed (non-PATS) key transponder, Unprogrammed aftermarket or duplicate key being used, Faulty or misaligned transceiver antenna ring around ignition lock, Interference from other transponders or metal objects on the key ring, Wiring or connector fault between the antenna and module, Weak key fob or vehicle battery affecting the read, Faulty PATS/anti-theft control module. The specific cause varies by vehicle.
How much does it cost to fix B1602?
Repair costs for B1602 range from $400 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by B1602?
Au7o has documented B1602 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.