CHEVROLET DTC P1601 - Serial Comm. Problem With Device 1
The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored on the scan tool for later reference.
The UART serial data circuit must be OK so the IPC can send the password XXXXX to the PCM. A DTC P1601 being set would indicate that the UART serial data circuit cannot be used to send information and causing the P1629 also.
An IPC theft deterrent DTC being set would indicate that the Passlock System is faulty and not sending a password XXXXX the PCM. Additional information can be found in Accessories and Optional Equipment / Antitheft and Alarm Systems. See Accessories and Optional Equipment\Antitheft and Alarm Systems
After any Passlock System parts have been replaced, the PCM must relearn the password XXXXX these components.
Replacement PCM's must be reprogrammed. Refer to the latest Techline information for programming procedures.
If no faults have been found at this point and no additional DTC's were set, refer to Diagnostic Aids for additional checks and information.
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How to solve a problem of code p1601 of TOYOTA 2006 1KD engine
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