Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Retrieving Codes
Before beginning any testing, retrieve any existing Diagnostic Trouble Codes (DTCs) from Passive Anti-Theft System (PATS) module. See ON-DEMAND SELF-TEST in appropriate MODULE COMMUNICATIONS NETWORK article. Make any repairs that may be indicated and perform appropriate code related test under SYSTEM TESTS.
| DTC | Description | Possible Source |
|---|---|---|
| U1147Β | Vehicle Security Status Message Missing | Circuitry. Multiplex communications network concern. |
| B1213Β | Anti-Theft Number of Programmed Keys Is Below Minimum | Circuitry. Transceiver module. Powertrain control module (PCM). |
| B1600Β | Ignition Key Transponder Signal Not Received | Fuse. Circuitry. Damaged encoded ignition key. Passive anti-theft system (PATS) transceiver module. |
| B1601Β | Incorrect Key Code From Ignition Key Transponder | Circuitry. Encoded ignition key. Passive anti-theft system (PATS) transceiver. |
| B1602Β | Invalid Format Key Code From Ignition Key Transponder | Passive anti-theft system (PATS) module. Powertrain control module (PCM). |
| B1681Β | Transceiver Module Signal Not Received | Circuitry. Transceiver module. Passive anti-theft system module. |
| TEST AΒ | No THEFT Indicator Prove Out | Fuse(s). Circuitry. PATS module and transceiver. Damaged light emitting diode (LED). |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.