U0140 Lost Com's with BCM ?? - Jeep Garage - Jeep Forum

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  #1  
Old 08-09-2015, 06:23 AM
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U0140 Lost Com's with BCM ??

Washed and cleaned the Jeep today and tonight I thought I'd just put the OBDII scanner on check for any codes.. Displayed U0140. Had no reason to check for codes and was surprised to see this one.. Could only find limited info about this code for the 2015 JK Wrangler.. Anyone had this on the WK2.. Thoughts anyone
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  #2  
Old 09-17-2015, 08:49 PM
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I had this occur today after leaving my ScanTool.net OBDLink MX plugged in while my 2014 WK2 EcoDiesel was shut off for refueling. I have become inured to the ScanTool.net device causing the Jeep to freak out from time to time ("Service Shifter", "Service Adaptive Headlights", EVIC rapidly cycling through screens and flashing error lights, etc). I have fond memories of the first time I plugged in the OBDLink MX and powered up the Jeep only to be greeted by the "Service Shifter" error message, and frantically scrambling to remove the ScanTool.net device before it fried my brand new Jeep--hoping it wasn't too late. Haha, I learned quickly that the Jeep survives these "seizures" caused by the OBDLink MX.

Anyway, this time, in addition to making the Jeep EVIC completely freak out, the ScanTool.net product caused two MIL codes to be set that required clearing: U0140 and U0121. I really don't like seeing the Check Engine light, especially when it's not caused by a problem with the Jeep but rather the ScanTool.net device.

Fortunately, the ScanTool.net OBDLink MX hasn't caused my vehicle to lose power or go into limp mode while underway (yet?).
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Old 09-17-2015, 09:03 PM
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Re: U0140 Lost Com's with BCM ??

Was the app you're using to read the data connected and interrogating the OBD at the time?

Cheers,
Steve
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Old 09-17-2015, 09:19 PM
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Quote:
Originally Posted by Barboots View Post
Was the app you're using to read the data connected and interrogating the OBD at the time?
Today, yes. I know the ScanTool.net device was incongrously produced with no way to actually sense whether the vehicle is on or off (therefore they blame apps if the vehicle is off and their product doesn't protect the battery from drain as advertised, for example). However, errors caused by the ScanTool.net OBDLink MX have also occurred without any app running or device connected.

I'll put it this way: I have *never* seen a "Service Shifter" message without the OBDLink MX plugged in.
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Old 09-17-2015, 09:29 PM
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Re: U0140 Lost Com's with BCM ??

The interrogation of the OBD system seems to cause congestion or delays on the bus at the point in time where numerous "start up" messages need to be processed.

I don't get many routine error messages from having my OBD dongle inserted. However I will always* get the same message as you have described if I start the car with Torque active.

Cheers,
Steve

*Always = every time on the extremely rare occasion I do it... I think
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Old 09-20-2015, 02:21 AM
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I have the OBDLinkLX version which is basically the same in our application. I find when Torque starts protocol detection is when the vehicle systems will start reporting bogus errors. Setting Torque to the correct protocol (ISO 15765-4 CAN 11-bit 500k baud) will prevent it.
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Old 09-20-2015, 10:30 AM
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Quote:
Originally Posted by MBDiesel View Post
Setting Torque to the correct protocol (ISO 15765-4 CAN 11-bit 500k baud)
That's a good point in case people search this in the future. It also helps Torque establish communication with the vehicle more readily.

However setting that protocol reduces, but does not eliminate, these errors with the ScanTool.net OBDLink MX. I configured the protocol on the first day of ownership, after the first "Service Shifter" and EVIC freakout.

I've seen plenty of these errors and "seizures" since then.
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Old 09-20-2015, 04:33 PM
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Re: U0140 Lost Com's with BCM ??

Quote:
Originally Posted by Roadkill View Post
However setting that protocol reduces, but does not eliminate, these errors with the ScanTool.net OBDLink MX. I configured the protocol on the first day of ownership, after the first "Service Shifter" and EVIC freakout.

I've seen plenty of these errors and "seizures" since then.
Correct; I should have said prevents it in my case with the engine running. I'm not sure if there's any difference in this case between the MX and LX.

For some reason Torque will still try other protocols if you start Torque when the adapter is plugged in and the ignition is off. When the ignition is switched on, Torque is still trying other protocols and putting bogus commands (for our systems) on the bus until it lands on the correct one.
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  #9  
Old 12-04-2015, 05:23 AM
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Re: U0140 Lost Com's with BCM ??

Last night my car wouldn't start, it just turned over once, then nothing. Same happened again 3 times today. Half of these times, there was no battery power at all. The other half, there was power, and each of those times, I moved the seat back a touch, and it started fine on the next attempt.
Pulled a U0140 code from it tonight, which brought me here.
I've already had the BCM replaced under recall about 8 months ago.
I had an LED lightbar installed on the cheap and am concerned this may affect my BCM warranty if it's faulty again.



Cheers, Simon
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Old 12-05-2015, 03:06 AM
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Re: U0140 Lost Com's with BCM ??

TSB 18-096-15 Rev A now fixes the U0140 code.
Told my Dealer about the code on the last service, I was treated as if I had made up the code.. What would an owner know! At least I can guide them in the right direction now.
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Old 12-15-2015, 04:07 PM
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Re: U0140 Lost Com's with BCM ??

Thanks for the bulletin, I have the same thing on my '14, will print it out an bring it to them to fix.. can't wait for the "you plugged in an OBDII scanner and therefore voided warranty" spiel.
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