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Could loss of communication with (bcm) be a reason that it will not register in park. the battery had died one night while cleaning the car with all doors open. the next morning when no start no crank

Sometimes when i pull up and go to get out the key will not come out and i have pull the shi8fter as if tring to reverse and then let it go to make it go all the way in park. my traction control light,abs,check engine loights are all on. the security light is coming on and going off like normal i suppose.

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  • justin lawson
    justin lawson Dec 26, 2016

    No the battery was recently draid due to some lights left in and door left open .Now it says lost connection with Bcm . Won't start in neurtrel either. Do I have to reprogram the Bcm every time I change battery or starter or alternator



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Have you had the battery and charging system testem ?

Posted on Dec 26, 2016


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Ic been looking for a rpm signil in my 2002 Chevy cavalier

Where have you been looking ? RPM signal for what ?
The IPC displays the engine speed as determined by the BCM via a class 2 message. The BCM receives a class 2 message from the PCM indicating the engine speed. The tachometer will default to 0 RPM if:
• The PCM detects a malfunction in the engine speed sensor circuit.
• The IPC detects a loss of class 2 communications with the BCM.
• The BCM detects a loss of class 2 communications with the PCM.

The CKP sensor is used for ignition timing, the fuel injector timing, misfire diagnostics and tachometer display. The CKP sensor is connected to the ECM by a signal circuit and a low reference circuit.

Jul 20, 2017 | Cars & Trucks

1 Answer

2007 Saturn Vue while driving, speedometer stops working and trans starts shifting funny

The electronics involved are unique to say the least .
The instrument panel cluster (IPC) displays the vehicle speed based on the information from the body control module (BCM). The engine control module (ECM) calculates the vehicle speed based on the controlled area network (CAN) serial data message indicating the wheel reference speed from the electronic brake control module (EBCM). The ECM sends a CAN serial data message to the BCM indicating the vehicle speed. The BCM sends a class 2 message to the IPC indicating the vehicle speed.
The speedometer defaults to 0 km/h (0 mph) when any of the following occur:
• The EBCM detects a malfunction in the vehicle speed sensor circuit.
• The ECM detects a loss of CAN communications with the EBCM.
• The BCM detects a loss of CAN communications with the ECM.
• The IPC detects a loss of class 2 communications with the BCM.

Is the ABS light lit ? Having the vehicle checked for DTC'S - diagnostic trouble codes would be the best first step to finding the problem . Could be a wheel speed sensor or ?????? .

May 14, 2017 | Saturn Cars & Trucks

1 Answer

Do you have to get the bcm flashed or reprogrmed every time the battery goes dad on a 2006 buck lucern

All systems should reset after disconnecting and reconnecting a good charged battery. However, before going any further you should remove the dead battery, have it checked and either replace it or charge it out of the vehicle. Then, install it and see if that works. If not, you probably will have to replace the BCM. Jump starting a dead battery is a very bad idea unless it is done very carefully, and even then, it can cause damage to modules.

Dec 28, 2016 | 2006 Buick Lucerne

1 Answer

Not resigtering it is in park. so no start no crank no click no nothing . loss on communication with the bcm is the dtc. charged battery and still nothing.

Try starting it in neutral. If it starts OK and every time, replace the range sensor/ neutral safety switch, on the transmission.. After that replace the RF wheel bearing/sensor. Have the codes cleared . See if the Communication code goes away.

Dec 26, 2016 | Cars & Trucks

2 Answers

2001 buick century stalled without warning. tried to restart, but wouldnt crank, no fuel pump noise, no click. had power to radio, heater fan, flashers but not dashboard lights (prndl, fuel gauge).

Make sure battery has a full charge and battery connections all good. Check fusible links where applicable. Any component that doesn't work and is fuse protected, not only check the fuse, check the fuse circuit for voltage, use a test lite.
The wiring diagram is for starter circuit, you can see the fuses. Any testing for starter motor, make sure tranny is in park or neutral and parking brake is set. It is possible to jump crank relay to see if starter motor will crank, but, that doesn't mean it will start. Make sure vehicle can't move.


Nov 21, 2016 | 2001 Buick Century

1 Answer

Loss of communication with the tcm and pcm 05 lincoln navigator

check the battery terminals and posts are shiny clean and tight. Have a load test done on the battery to check for a cell bridge failure.

Mar 20, 2014 | 2005 Lincoln Navigator

2 Answers

I was driving on the highway and the engine lost power, got over to the side of the road and everything else was still on such as the radio, and other items. After a minute or so, I lost power completely....

Sounds like the BCM (body control module) has a loss of communication with the engine controller. You will need to have it scanned with a proper scan tool to retrive the fault codes that are stored in the memory...I hope this helps.

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1 Answer

U1064 code & can't check the codes on a scanner. engine starts & dies. when it was running the abs light & brake lights were on & theft & service lights were on.

Sounds like a blown fuse to one of the computers, either the ECM (engine control computer) or the BCM (body control computer). The ECM fuse should be under the hood and the BCM fuse in the cabin. The U1064 means a loss of communication on the data line between computers (64 usually is the BCM). If the computers can't communicate they will shut down the engine and set trouble codes. The other issue could be a faulty ignition switch not allowing power to a computer (but not common for cavaliers or sunfires). If fuses are good, chances are you have a faulty computer somewhere in the data line, shorting out communication.

Feb 24, 2011 | 2004 Pontiac Sunfire

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