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OBDII Bluetooth displayed on an old Galaxy Note 3. Chevy does provided a decent amount of information, but this 'feature' provides even more. True water temp, tranny temp, intake temp, timing advance, and fuel to air ratio to name a few.

Built a little cubby cover and mounted to the display there. (Other mag mount is for regular cell phone)





 

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ahhh- good use of leftover device.

Take note- leaving a device plugged into the OBD port can cause some issues.
If you see funny stuff happen- it could be the device plugged into the port.
 

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What issues? I've left my wifi ELM327 plugged in all the time for probably a year with no issues.
 

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TommyH4 said:
What issues? I've left my wifi ELM327 plugged in all the time for probably a year with no issues.


Multiple Conditions Caused by Aftermarket Devices Plugged into the Data Link Connector
February 11, 2013

For everything from saving on automobile insurance to connecting aftermarket cruise control, there are now a number of devices that owners plug into the Data Link Connector (DLC), or Assembly Line Diagnostic Link (ALDL). However, any unauthorized device connected to the DLC may cause a variety of hard-to-diagnose conditions.



Many of the problems caused by devices connected to the DLC are communication issues on the High Speed Controller Area Network (HSCAN) bus. An additional issue with diagnosing these conditions is that many times the device itself may be removed by customers when their vehicle is brought in for service.



Many possible problems are caused by an open connection on the HSCAN bus. For example, if the device only makes connection with one CAN +, it will cause bus errors and strange control module behavior.



Known Symptoms



The various issues described by customers with their vehicles are often related to high- or low-speed data bus traffic. The conditions can be extremely varied, but some known issues are:



• Radio will not turn off after turning off the vehicle

• Bus or LAN traffic stays active, leading to a discharged battery

• Problems reprogramming control modules either because of interference or the device will not allow the bus to power down

• Interference with OnStar’s ability to provide diagnostic data

• Engine and transmission performance issues with the Check Engine light on

• Intermittent stalling

• Reduced power DIC messages and DTCs

• StabiliTrak DIC messages and DTCs

• DTC C0561 (System Disabled Information Stored Invalid Data) in the Electronic Brake Control Module (EBCM) leading to a traction control issue

• No High Speed LAN communication along with various DTC communication U-codes

• Transmission will not shift for one key cycle (TCM in default mode)

• Instrument cluster gauges erratic or flickering

• Service Engine Soon or Check Engine MIL illuminated and numerous DTC communication codes such as U0100 (Lost Communication With Engine Control Module), U0101 (Lost Communication With Transmission Control Module), U186B (Electronic Brake Control Module Lost Communication with Transmission Control Module) and U1862.

• Diesel power-up devices resulting in no power in 4WD Low range

• Service Tire Pressure Monitor System MIL illuminated; cannot relearn the Tire Pressure Monitor System

• Hybrid issues regarding reduced propulsion power DIC messages and service high voltage charging system DIC messages



Diagnosis



TIP: The Diagnostic System Check – Vehicle (the starting point for any diagnostic procedure) in the Service Information calls out that there should not be any aftermarket devices connected or installed that affect the operation of the system. Additional information under Checking Aftermarket Accessories explains how to check for aftermarket accessories. The Diagnostic System Check Instructions link at the top of the Diagnostic System Check – Vehicle procedure also provides further information about aftermarket accessories and their possible negative effect on the vehicle.



During diagnosis, if nothing else can be identified as the root cause of the condition, check for a device plugged into the DLC.



If a device is available, attempt to duplicate the condition. Remove the device to determine if the condition is eliminated. If confirmed, inform the customer of the issue and that it will be necessary to work with the supplier of the device for further resolution. If the condition is not eliminated, continue with the diagnostics in the appropriate Service Information.



If any parts appear to have been damaged by the device or the installation of the device, document on the repair order what was identified on the vehicle. This would not be covered under the New Vehicle Limited Warranty.



Possible Devices



Connected devices may be used for such things as tracking and/or maintenance interval scheduling (more common on fleet and rental vehicles) (Fig 3), insurance monitoring that automatically keeps track of the vehicle’s driving record (Fig. 4), aftermarket cruise control (Fig. 5), police speed checking (RADAR or LIDAR) and other aftermarket components.




OnStar



Certain aftermarket devices connected to the DLC may interfere with OnStar’s ability to perform a diagnostic probe when requested (via a blue button call) by a subscriber. These devices also prohibit the ability to gather diagnostic and tire pressure data for a subscriber’s scheduled OnStar Vehicle Diagnostic (OVD) e-mail.



These aftermarket devices use the vehicle’s serial data bus to perform data requests and/or information gathering. When these devices are requesting data, OnStar is designed not to interfere with any data request being made by these devices as required by OBD II regulations.



When performing a diagnostic check for an unsuccessful or incomplete OnStar diagnostic probe, or for concerns regarding completeness of the OVD e-mail, verify that an aftermarket device was not present at the time of the requested probe.



If an aftermarket device is interfering (including a scan tool of any type), the OVD e-mail will consistently display a “yellow” indication in the diagnostics section for all vehicle systems except the OnStar System, and the tire pressure data (not available on all vehicles) will not be displayed (i.e. the section is collapsed).



Refer to Bulletin #08-08-46-004A for additional information on OnStar Diagnostic Services.
 

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So, has anyone had any issues with a device plugged into the OBD port long term?

Or, even for , say, several days?

rbarrios. .. how long at any one time have you left your scanner connected to the OBD port?
 

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I've left my scanner plugged in for several months without ever once pulling it out. No problem.
 

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JayTee2014 said:
So, has anyone had any issues with a device plugged into the OBD port long term?

Or, even for , say, several days?

rbarrios. .. how long at any one time have you left your scanner connected to the OBD port?
i have been using a scangauge in my daily driver since 2007, regularly in 3 different vehicles. i have taken it out and used it in other cars as well. never had an issue. its been in my 2012 Equinox since 2014 and never noticed a problem.
 

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gopedxr7 said:
i have been using a scangauge in my daily driver since 2007, regularly in 3 different vehicles. i have taken it out and used it in other cars as well. never had an issue. its been in my 2012 Equinox since 2014 and never noticed a problem.
Thanks. . . I have a scan gauge also, and was considering leaving it connected for some period of time. I would like to data log for several hundred miles and maybe more.
 

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JayTee2014 said:
rbarrios. .. how long at any one time have you left your scanner connected to the OBD port?
when I ran the MPG test on the Nox, abot 70 miles roundtrip.
I did see one side effect-- and dont know if its related...

But the TRIP B meter--- reset on its own.... back down to 0 miles and started counting again.
I use TRIP B to keep track of miles since last oil change.
 

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Hmm. . good to know. I also use Trip B for my oil mileage monitoring.
 

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rbarrios said:
But the TRIP B meter--- reset on its own.... back down to 0 miles and started counting again.
I use TRIP B to keep track of miles since last oil change.
Did it reset back to zero before reaching 10K? On our '11 Terrain Trip meters reset to zero after 9999 miles.
 

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no, the mileage was well below 7,000 miles on the trip meter.
 

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i just bought this cadillac so there shouldnt be anything hooked to it anymore. The other owner may not of uninstaLLED IT ! i TOLD THE GUY THAT SOLD IT TO ME THAT ENGINE LIGHT HAS STAYED ON. BUT HE DONT CARE. tell me how to fix it? i will try i havent had time to read all about the services yet. LeaAnn HIcks
 
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