What is the problem fault code p1601 - Hilux Toyota Cars & Trucks

P1600 PCM Battery/Serial Communication Between PCM & TCM P1601 Loss of Serial Communication (Except Catera)/ ECM Overtemperature..... Sorry i just dont have product knowledge to advise , You could try checking battery voltage with engine running and it should read 14.7 volts give or take a bit , if not showing this voltage then you may need a new altenator .. if voltage low then yes you will get problems like this ..

p1601: compression code

p0350: ignition coil primary/secondary circuit

did you change your spark plug (do you change them regularly)
coil pack is on its way?

is the car misfiring when started?
if yes then change coil.

Hi Marvin, I'm glad to help! The 2001 Dodge Caravan does not have a code P1601. There's a code P1602 for PCM Not Programmed, but if that were the case the engine would not start and run. I suggest clearing the code and see if it comes back, if it does, then have the PCM Re-Programmed and see what happens. Hope this helps and have an awesome day Marvin.

still under warranty , take it back to the dealer and say that you want code 1601 fixed properly, a code that they should have found if they followed the trouble shooting procedure properly
could be a bad ground connection or faulty wiring

double posted (backup one)
still no year. no year, no joy, not ever.
and ask a real question.
http://www.englishclub.com/vocabulary/wh-question-words.htm

hilux 2KD FTV , P1601 MEANS:

Type Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled Description ECM Overtemperature
Cause Engine running, then the PCM detected an internal temperature of over 221F or an internal temperature of -58F or over 284F.
SO, it is a PCM error, tep is too high normally, or you can ask the 24 hrs live technical support vas5054a, they will like to help you, good luck

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.

Hope helps (remember to rate this answer).

These two error codes may be related. The p1601 is saying that the internal temperature of the power control module PCM is too high or that the outside temperature is out side of normal range. The second code u1255 is set when control modules fail to send the right signals to one another. If the PCM is malfunctioning due to high temperature or error then this may cause the lack of data transfer and hence the u1255 signal. Disconnect the negative terminal to the battery. Check out the PCM, ensure that all electrical connections to it are clean and secure; a poor connection can generate quite a lot of heat hence the p1601. Ensure that there is no sign of wires shorting underneath the PCM. If all connections look clean and free of corrosion open up the PCM and look for obvious hot spots on the main board. A dry joint or annular crack in the solder around a power pin on the board can create heat. If you see this just re-solder. If the board is cooked beyond repair then a new PCM is needed. Ensure that the PCM is shielded from direct sources of heat such as the exhaust manifold etc. When the battery is reconnected the error codes most likely will have been cleared but if the problem persists the error codes will be logged again.

dear friend:code p1601 stands for engine control module(ecm)transmission control unit(tcm)-serial peripheral comminication malfunction,code p1282 stands for fuel pump relay-open circuit,fuelpump relay faulty and p1687 stands for metering oil pump-high flow-circuit malfunction,(wiring metering oil pump switch metering oil pump and ecm