So,,, Range AFM undetectable?

[jamin87ss]

So I am not super tech guy, but after some help on here I decided to get a Range AFM, between the Range and GB off I feel the truck drives alot nicer,.

 

However ever now and then my engine light comes on and the truck won't shift, I simply unplug the unit, cycle the key, and put it back in. no problems, this happens every so often just enough to aggravate me. but not enough to chuck it out the window, I have the latest and greatest I was told. I have not contacted range because I bought it second hand here from a member.

 

So,, now the fun part these are sposed to be undetectable, I just got my monthly diagnostics report from onstar,

 

 

Engine and Transmission System

• We were unable to successfully complete a diagnostic test. This issue may be caused by an aftermarket device plugged into your vehicle's diagnostic port.
• If an indicator light is lit on your dashboard, push your blue OnStar button.

 

Air Bag System

• We were unable to successfully complete a diagnostic test. This issue may be caused by an aftermarket device plugged into your vehicle's diagnostic port.
• If an indicator light is lit on your dashboard, push your blue OnStar button.

 

 

???????????

[gone_fishing]

When I still got those reports with the complementary OnStar, my ScanGuage II had those same errors in the report. I have never had any issues though with having to unplug it to fix something (leave it plugged in all the time for the last 2.5 years).

[Towerhog]

The Range AFM doesn't write anything to the ECM. It only intercepts a signal on the CAN-BUS line and then modifies the signal to keep the ECM in V8 mode. The problem you are having with the other systems are because they use the same CAN-BUS line as the V4/V8 mode and the AFM blocks their signal at times so they cant complete their checks. According to AFM, it affects the OnStar diagnostics.

 

When you take your vehicle in for service, simply unplug and leave the device at home. Service will never know it was there. Service done, drive home and plug it back in.

[LongrangeLauber]

It detects something but it doesn't know what it is. For all they know it could be one of those Progressive Insurance snapshot obd2 trackers that track how you drive. Nothing to worry about

[AllTerrainX]

I just drive in M7 mode when city driving, M8 when I hit the highway. Had a Range device for my 07 Avalanche and never liked them because of the issues they would cause. Draining the battery, have to unplug and replug just to get it to kick back in and disable AFM.

[JacobC1983]

I have only had mine a couple days, but I do have to admit that it has calmed my truck down. With AFM disabled, the lack of transitions from V4 to V8 has reduced the amount of clunks and pressure changes I feel when driving around town. I hope it continues to work flawlessly.