2015 Escalade Flex Upgrade Issues

So I wired the flex sensor and Pinned X1 Blue pin 38 like everyone recommends for the E92 ECU. There was a wire in that terminal. Removed and placed the Vout for Ethanol sensor. Switched everything in the tune. Still nothing showing at all in the log. Is the Pin location different for this model? The tune has everything enabled.

Really not sure why it is not working. Went and put 25 Gallons of E85. Car instantly started to pull fuel. -19 on Long Term. Still see nothing in the ECU for Ethanol percentage. Using Beta Scanner. Some help would be great.

Many Thanks

post the tune. weird that adding E85 would cause negative fuel trims. sure the car wasnt already a flex vehicle? thats the right pin for the fuel composition signal

Here is the tune

Attachment 103152

There shouldn?t have been a wire in the terminal on a non flex fuel vehicle..

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Originally Posted by Ben Charles

There shouldn?t have been a wire in the terminal on a non flex fuel vehicle..

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That is exactly what I thought. But I could be very wrong here. Anyone have a picture?

Some of the trucks already have the wiring in place for a flex sensor. The connector is down on the driver frame rail in front of the fuel tank.

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Originally Posted by 32vape

Some of the trucks already have the wiring in place for a flex sensor. The connector is down on the driver frame rail in front of the fuel tank.

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The wiring for a flex fuel sensor was already there on my 2016 Suburban. I have to imagine an Escalde is no different.

The plug was inserted into a blanking receptacle on the frame rail just aft of the driver door.

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Originally Posted by pisces_0

The wiring for a flex fuel sensor was already there on my 2016 Suburban. I have to imagine an Escalde is no different.

The plug was inserted into a blanking receptacle on the frame rail just aft of the driver door.

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After doing some more digging. It looks like the schematics people have are not very detailed. I believe as well that if it was a 5.3 suburban. Then it would have one. From all my findings all the 6.2L engines did not come with the sensor wire attached.

I'm a chevy tech and pulled the schematics for X1 off of our service information data and it has pin 38 occupied and listed as "fuel composition/temperature input" for a 15 Escalade with a 6.2...

My 6.2 L86 on my Sierra has the sensor wire attached. It's under the drivers side door plugged into a dummy plug on the cross brace of the frame. I just added the sensor in between the soft line coming off the tank and the hard line that runs down the frame. Lay under there and you'll see what I'm talking about.

My 2018 Sierra Denali 6.2 had the wiring and a blank plug, I'll throw some pictures up.

Did anyone came up with an answer on this? I have the same issue on a 2016 Escalade. I can't find the location where the pin goes. I tried looking in front of the gas tank and I don't see any dummy plugs.
On the manuals it says it's pin#38 but there is an existing cable on there. "fuel composition/temperature input".
Anyone had any luck figuring this out?

The trucks have existing wiring in place for a sensor. It's taped to the wiring harness on the frame rail in front of the fuel tank. You can just de-pin the existing wire at the ECU and pin in the new sensor wire.

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Originally Posted by 32vape

The trucks have existing wiring in place for a sensor. It's taped to the wiring harness on the frame rail in front of the fuel tank. You can just de-pin the existing wire at the ECU and pin in the new sensor wire.

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Is this true on all trucks? I have a 2016 Escalade. X1 pin 38 is occupied, but I can?t for the life of me find the connector under the truck.

Can't say for 100% sure this it true with the Escalades, but the trucks' wiring is along the driver side frame rail very close to the fuel lines. See pics showing where the blank plug sits, and a factory-style installation...

Should be the same on the Escalade. I had the plug on my 16 Yukon XL Denali. Purchased the sensor and necessary fuel connector pigtail and done. Enable necessary parameters in calibration and works as expected.

Same here on a 2017 Sierra crew cab long bed L86. I had seen some kits with the sensor and compression fittings on it to where you cut a piece of the fuel line out and can install in the middle of the metal line with compression fittings...

I then came up with the same thing it sounds that Jonblarc7 did. I pulled the quick connect line by the tank where it goes into the steel line, then added sensor and another short flexible line. Easy to install and reliable. I did have to solder extensions on the sensor cable connection, but that was not bad.

Attachment 121008Attachment 121009

I just picked up the parts to do this as well... ICT Billet has a 48" flex fuel extension harness for $33, and I took a gamble on trying to match the GM OEM part that Lethal Garage uses in their 'kits'... found a fuel line from a 2014 Camaro (22912576) that looks like it should work. Should be able to mount the sensor where the steel fuel line mates to the flexible line coming from the tank... we will see! Between Rock Auto and ICT, it was about $170 for all parts, tax and shipping... (that includes the yellow gas cap as well).

Here are the OE parts if interested.
- Flex Fuel sensor GM# 13577429
- GM bracket for mounting the FF sensor to the frame 20967866
- Factory (ACDelco) gm fuel line P/N for connecting the sensor: 20967836. On the Yukon Denali/Escalade/Tahoe/Suburban (not sure on Sierra/Silverado, etc.), you can simply replace the short female/male connector with this female/female OEM connector. Got mine online for 12 bucks

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Originally Posted by WingsAA

Here are the OE parts if interested.
- Flex Fuel sensor GM# 13577429
- GM bracket for mounting the FF sensor to the frame 20967866
- Factory (ACDelco) gm fuel line P/N for connecting the sensor: 20967836. On the Yukon Denali/Escalade/Tahoe/Suburban (not sure on Sierra/Silverado, etc.), you can simply replace the short female/male connector with this female/female OEM connector. Got mine online for 12 bucks

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I had noticed some had gotten away with doing this method you mention too. But my CCLB sierra has a solid line all the way past this section. So no place to tap in right at the spot where the sensor connector is. I would have to agree with your thinking that the SUV's have a spot setup in the fuel line there for it, but the trucks do not. Or at least not all trucks do.

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Originally Posted by Dominatorstang

I had noticed some had gotten away with doing this method you mention too. But my CCLB sierra has a solid line all the way past this section. So no place to tap in right at the spot where the sensor connector is. I would have to agree with your thinking that the SUV's have a spot setup in the fuel line there for it, but the trucks do not. Or at least not all trucks do.

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Figured, that's why I noted I wasn't certain on the Silverado/Sierra.
Luckily, on the SUV's you just need to replace the short hose assembly to the gm female to female assembly. Luckily that's it for the SUV's.

For the Silverado/Sierras you have to either install it like Dominatorstang did (and I will be doing a variation of) where the sensor is further rearward than it is with the factory installation or... if you want a true factory-style installation, you have to have the following parts:

Flex Fuel Sensor - 13577429
Flex Fuel Sensor Mount - 20967866
Flex hose/fuel line (towards engine) - 23171538
Flex hose/fuel line (towards fuel tank) - 20967834
Fuel line (towards engine) - 23171532 (I think this is the correct P/N, but was difficult to verify online)
Fuel line (towards fuel tank) - 23158924 (this varies depending on wheelbase, but this is the part for a 153" wheelbase)
Fuel line bracket - 15168646
Fuel Tank Filler Cap E85 - 22921366

Single cab trucks also need a filler hose, as the factory had different ones for Gas vs. E85. Crew cabs and extended cab trucks have an E85 ready filler hose.

1st time post here, so go easy on me ....

running off the E85 virtual currently and want to move to a true sensor.

Has anyone had any dealing on a 2018 Escalade and no sensor plug? The closet I have seen pics/vids on, are of the sensor plug on the gas tank shield with a tree connector on a 2018 Denali L86, but I cant find anything on my 2018 Escalade L86 6.2L.

any body ever find the plug?

also, as others say, the 2018 escalade shows a pin on X1 38 already (fuel temp/composition)... is this pin used on something else on non flex trucks? will taking this stock wire off and tapping my sensor to it affect anything else?

thanks
Rob

The plug should be there on your Escalade. Drivers inside of the frame rail just in front of the fuel tank.
Attachment 124443
Attachment 124444

This shows where the sensor goes. The plug is right near there and should currently be plugged into a dead connector to protect it.

That?s where I was looking. Just concerned an Escalade might be different. It does have a huge automatic running board harness around that area. On the 2018 Denali Yukon it?s on the plastic tank guard. Closest open hole next to frame. You think maybe it?s in a different spot ?

The connector will look like it's plugged in... It's a dead socket. I'll take a picture of mine later tonight and post it.

Awesome thanks!

Here's the connector plugged into my FF sensor. It's a bit tricky to hold the light and get a decent shot so hopefully this helps. The connector end is a brownish/orange color.
Attachment 124477
Attachment 124478
Attachment 124479

Yea where you have the 2 bundles coming out of the plastic ?Tee?? I only have one, for the sensor in the fuel line. Bummer. Maybe late escalades had that omitted from the harness.

I?m thinking on trucks that had only one engine option they didn?t add the plug, ie all suburban Yukons and tahoes had an option 5.3. On the 6.2 on the Escalades. I guess I?ll just wire it in off something for power.

Thanks wings for all your help.

Rob

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Originally Posted by talonman69

I?m thinking on trucks that had only one engine option they didn?t add the plug, ie all suburban Yukons and tahoes had an option 5.3. On the 6.2 on the Escalades. I guess I?ll just wire it in off something for power.

Thanks wings for all your help.

Rob

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Bummer.
Could be they just omitted it starting in '18 or something. Mine's a '16 6.2 Yukon XL Denali for reference.

2016 Escalade ESV here. No connector under the drivers door. ECM is already pinned. Will pin the x125 pin 17 connector to the alcohol content sensor and report back after I get everything installed.

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Originally Posted by jergren

2016 Escalade ESV here. No connector under the drivers door. ECM is already pinned. Will pin the x125 pin 17 connector to the alcohol content sensor and report back after I get everything installed.

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Did you get it to work?

did you get the 2016 escalade esv work?
i have a 2020 escalade esv, i really want to change my car to be flex fuel, can anyone here help?

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Originally Posted by Jonathanhm214

Did you get it to work?

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Yep, been working great the past 10,000 miles or so.

I do not have the plug either, 2016 Escalade. When I looked at the factory data it shows x125 pin 17. Shows white wire circuit 1579.

Can confirm on my 15’ Escalade the signal wire pins out on x125 pin 17. Pinning the molex m150 style connector is the most difficult part due to location and restrictions of the male harness free movement. There are some videos on how to disassemble males connector to insert pin. You’ll need to salvage an old harness to find a pin. Or I used one of these.

https://www.customconnectorkits.com/...s/33000-1002-l

I used GM flex fuel sensor and GM female to female fuel line connector mentioned in previous posts. You’ll also want the GM plastic mount as it provides the exact amount of space from the chassis to make this fuel line work.

Used a fuse tap add a fuse for power with 5amp fuse for ignition power. Just used firewall ground as well for now. May move power and ground later to make it more discrete/more factory like.

Just bought a pre wired flex fuel sensor connector with 6 feet of wire, this was long enough with a little slack for sensor wire.

2017 escalade, no connector for me either. i really dislike the add a fuse idea. i'd rather install a terminated lead into an empty spot in one of the fuse blocks. for example, zzperformance makes a kit for cadillac ats and this is how it installs, with its own 10 amp fuse into an empty spot in one of the fuse blocks. i just don't know the size of the terminated lead required. i already have the terminated lead for ecu pin