Fix the inaccurate MPG display in 2 minutes!
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Joined: Jun 2017
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Fix the inaccurate MPG display in 2 minutes!
The LOM is known to be pretty inaccurate for most of us. The good news is that you can fix it quickly and easily in 2 minutes with no tools if you know roughly how far off it normally is...
This was posted on another forum, but I thought it was too helpful not to share. Note, I used it for the 8" display size and it worked perfectly. I modified the procedure to be more clear than what was posted on the other forum. I have not tried the 4.2" display procedure because I don't have that one. I did this and my next fillup was accurate to within 0.1mpg.
FIST!!
Take your hand calculated MPG and divide it by the LOM display MPG....then multiply by 1000. This new number is what you will change the AFE Bias to.
Mine worked out to be 934 because my hand calculation was 18.3mpg and my LOM said 19.6mpg. Example: 18.3/19.6 = .9337xxxx. Multiply by 1000 gave me 934 (I rounded up) as the number to use.
For Lariat and up 8 inch Display:
Engine off.
1. Press and hold OK Button on the left side of the steering wheel and don't release it until the end.
2. Press push start Button only (Not Brake Pedal) to turn to Accessory Mode.
3. Once Message “Accessory Mode” appears.... press the Brake Pedal and turn the Engine on.
4. Engineering Test Mode appears instantly. Release OK button.
5. Scroll to AFE Bias and push OK to change it to the number you calculated. Note, it takes quite a few clicks to get to AFE Bias.
6. Once done, turn off truck and it will update your mpg, including your Trip 1 and Trip 2. You'll see it has changed the next time you start the truck.
Note....quite a few of us have been successful just holding down the OK button, starting the truck, then releasing the OK button once Engineering Mode pops up.
For 4.2 inch Display:
Engine off.
Press and hold OK Button on the left side of the steering Wheel.
Continue holding OK button and start the engine...don't let go of OK button until "Engineering Test Mode" appears.
Go through the menu pressing and releasing OK Button until you reach "AFE Bias 1000" appears.
Press and release Down. Using Left and Right change 1000 to the Number You calculated. Press OK.
To leave Engineering Mode after you are done, just turn the engine off.
This was posted on another forum, but I thought it was too helpful not to share. Note, I used it for the 8" display size and it worked perfectly. I modified the procedure to be more clear than what was posted on the other forum. I have not tried the 4.2" display procedure because I don't have that one. I did this and my next fillup was accurate to within 0.1mpg.
FIST!!
Take your hand calculated MPG and divide it by the LOM display MPG....then multiply by 1000. This new number is what you will change the AFE Bias to.
Mine worked out to be 934 because my hand calculation was 18.3mpg and my LOM said 19.6mpg. Example: 18.3/19.6 = .9337xxxx. Multiply by 1000 gave me 934 (I rounded up) as the number to use.
For Lariat and up 8 inch Display:
Engine off.
1. Press and hold OK Button on the left side of the steering wheel and don't release it until the end.
2. Press push start Button only (Not Brake Pedal) to turn to Accessory Mode.
3. Once Message “Accessory Mode” appears.... press the Brake Pedal and turn the Engine on.
4. Engineering Test Mode appears instantly. Release OK button.
5. Scroll to AFE Bias and push OK to change it to the number you calculated. Note, it takes quite a few clicks to get to AFE Bias.
6. Once done, turn off truck and it will update your mpg, including your Trip 1 and Trip 2. You'll see it has changed the next time you start the truck.
Note....quite a few of us have been successful just holding down the OK button, starting the truck, then releasing the OK button once Engineering Mode pops up.
For 4.2 inch Display:
Engine off.
Press and hold OK Button on the left side of the steering Wheel.
Continue holding OK button and start the engine...don't let go of OK button until "Engineering Test Mode" appears.
Go through the menu pressing and releasing OK Button until you reach "AFE Bias 1000" appears.
Press and release Down. Using Left and Right change 1000 to the Number You calculated. Press OK.
To leave Engineering Mode after you are done, just turn the engine off.
Last edited by Kingofwylietx; Aug 22, 2018 at 11:55 PM.
Flaccid Member
Joined: Sep 2016
Posts: 2,168
Likes: 588
From: Maine
That's pretty awesome... what else is in Engineering Test Mode?
I've never hand-calculated MPG for this truck. It's just never been that important to me. Now I have an excuse to do it.
I've never hand-calculated MPG for this truck. It's just never been that important to me. Now I have an excuse to do it.
Last edited by DeltaNu1142; Jul 20, 2018 at 11:31 AM.
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Thread Starter
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Joined: Jun 2017
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It allows you to change the AFE Bias....I didn't think to see what else could be changed.
