Coolant Sensor “Temp” Fix with NO CEL on

Titanfreak said:

Dealing with this same issue as of today. 2019 XD Diesel 56000 miles. Thank you for posting this, easy fix till Nissan gets the parts in. Of course it happened after service dept is gone for the week. Is this something that the warrant will cover under the 100,000 miles warranty? If not I’ll just take care of it myself. Thanks in advance.

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CPS said:

Yes this is the “new improved” coolant overflow tank and is covered under Nissans warranty and you should not be paying for it out of pocket. Were the step by step directions listed above exactly how you did the temporary repair? Thanks, CPS

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CPS said:

Also, you can drive with it like this until the new coolant tank comes in, and you shouldn’t have any CEL lights on the dash!

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Titanfreak said:

Glad to hear warranty will cover it…I’ll be doing the temp fix step by step in the morning. Currently 6 degrees outside here in central PA…it can wait till morning at those temps…lol. Thanks for the info.

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Titanfreak said:

Should mention the reduced power only lasted a mile or so, but CEL stayed on, and is still on. Hoping this is all it is and not an EGR issue…either way being under warranty makes me feel better. We have 2 titans, 2004, 2019, and a 2022 rogue, so far our local Nissan has always taken pretty good care of us even tho none of them were purchased there.

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CPS said:

Hopefully this will help one of you!
Just hit 34,000 on 2019 Cummins, driving home, check engine light came on, followed by “reduced engine power warning”, pulled over, scanned OBDII, and got code P00B7 (coolant level too low).
1) checked coolant level and it was at the correct level
2) pulled the wiring harness plug off of the coolant level sensor on the bottom of the overflow tank
3) used scanner to clear code P00B7 so “reduced engine power warning” and check engine light goes away and you can drive home like normal….ish! No issues while driving
4) got home and the check engine light comes on again, code P2559 (coolant level sensor plug disconnected). Not a big deal, because this code will not trip the “reduced engine power warning”
5) called the dealer, they ordered a new overflow tank/sensor for me, will be delivered in a week
6) in the mean time I didn’t want that pesky check engine light on so I did what the technicians are trained to do at the dealership to get your truck back on the road until the coolant tank comes in (temporary fix)
7) disconnect and remove the passenger side battery (disconnecting both batteries terminals is a safe practice to follow)
8) disconnect the harness plug from the coolant level sensor at the bottom of the coolant tank again
9) now, push up on the bottom of the sensor ever so slightly, and at the same time, rotate the sensor 1/4 of a turn clockwise (the sensors plug end should be facing the front bumper this point), then pull straight down and the sensor will come out, it will be loose and just sitting there against the metal bracket below it (you will not be able to take out the entire sensor, it will just rest there)
NO COOLANT WILL COME OUT REMOVING THIS SENSOR, SO DON’T WORRY ABOUT THAT
10) rotate the sensor back 1/4 of a turn counter clockwise and re-install the harness plug back on the coolant level sensor and just let the sensor sit on the metal bracket below.
11) install passenger side battery, connect battery terminals, and use scanner to clear the check engine light code P2559
12) you should no longer have any CEL’s on the dash at this point, and they shouldn’t reappear while you are waiting for your new coolant overflow tank to come in.
The end!
View attachment 47607

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CPS said:

Hopefully this will help one of you!
Just hit 34,000 on 2019 Cummins, driving home, check engine light came on, followed by “reduced engine power warning”, pulled over, scanned OBDII, and got code P00B7 (coolant level too low).
1) checked coolant level and it was at the correct level
2) pulled the wiring harness plug off of the coolant level sensor on the bottom of the overflow tank
3) used scanner to clear code P00B7 so “reduced engine power warning” and check engine light goes away and you can drive home like normal….ish! No issues while driving
4) got home and the check engine light comes on again, code P2559 (coolant level sensor plug disconnected). Not a big deal, because this code will not trip the “reduced engine power warning”
5) called the dealer, they ordered a new overflow tank/sensor for me, will be delivered in a week
6) in the mean time I didn’t want that pesky check engine light on so I did what the technicians are trained to do at the dealership to get your truck back on the road until the coolant tank comes in (temporary fix)
7) disconnect and remove the passenger side battery (disconnecting both batteries terminals is a safe practice to follow)
8) disconnect the harness plug from the coolant level sensor at the bottom of the coolant tank again
9) now, push up on the bottom of the sensor ever so slightly, and at the same time, rotate the sensor 1/4 of a turn clockwise (the sensors plug end should be facing the front bumper this point), then pull straight down and the sensor will come out, it will be loose and just sitting there against the metal bracket below it (you will not be able to take out the entire sensor, it will just rest there)
NO COOLANT WILL COME OUT REMOVING THIS SENSOR, SO DON’T WORRY ABOUT THAT
10) rotate the sensor back 1/4 of a turn counter clockwise and re-install the harness plug back on the coolant level sensor and just let the sensor sit on the metal bracket below.
11) install passenger side battery, connect battery terminals, and use scanner to clear the check engine light code P2559
12) you should no longer have any CEL’s on the dash at this point, and they shouldn’t reappear while you are waiting for your new coolant overflow tank to come in.
The end!
View attachment 47607

Click to expand...

CPS said:

Hopefully this will help one of you!
Just hit 34,000 on 2019 Cummins, driving home, check engine light came on, followed by “reduced engine power warning”, pulled over, scanned OBDII, and got code P00B7 (coolant level too low).
1) checked coolant level and it was at the correct level
2) pulled the wiring harness plug off of the coolant level sensor on the bottom of the overflow tank
3) used scanner to clear code P00B7 so “reduced engine power warning” and check engine light goes away and you can drive home like normal….ish! No issues while driving
4) got home and the check engine light comes on again, code P2559 (coolant level sensor plug disconnected). Not a big deal, because this code will not trip the “reduced engine power warning”
5) called the dealer, they ordered a new overflow tank/sensor for me, will be delivered in a week
6) in the mean time I didn’t want that pesky check engine light on so I did what the technicians are trained to do at the dealership to get your truck back on the road until the coolant tank comes in (temporary fix)
7) disconnect and remove the passenger side battery (disconnecting both batteries terminals is a safe practice to follow)
8) disconnect the harness plug from the coolant level sensor at the bottom of the coolant tank again
9) now, push up on the bottom of the sensor ever so slightly, and at the same time, rotate the sensor 1/4 of a turn clockwise (the sensors plug end should be facing the front bumper this point), then pull straight down and the sensor will come out, it will be loose and just sitting there against the metal bracket below it (you will not be able to take out the entire sensor, it will just rest there)
NO COOLANT WILL COME OUT REMOVING THIS SENSOR, SO DON’T WORRY ABOUT THAT
10) rotate the sensor back 1/4 of a turn counter clockwise and re-install the harness plug back on the coolant level sensor and just let the sensor sit on the metal bracket below.
11) install passenger side battery, connect battery terminals, and use scanner to clear the check engine light code P2559
12) you should no longer have any CEL’s on the dash at this point, and they shouldn’t reappear while you are waiting for your new coolant overflow tank to come in.
The end!
View attachment 47607

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Surf City XD said:

I can relate. Had the exact thing happen at 46k. It's under warranty but on backorder. They disconnected it which left the check engine light on. Truck is doing perfectly besides that.

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JAO said:

Is there any harm with not adjusting the sensor and just driving as usual as long as you're sure it's only giving you the P00B7 code? Just curious.

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JAO said:

Is there any harm with not adjusting the sensor and just driving as usual as long as you're sure it's only giving you the P00B7 code? Just curious.

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Two Yeets said:

If you're stock, I believe it'll put you in limp mode. If you're deleted and tuned, it just gives you a check engine light. Either way, dropping the sensor and letting it sit there will get rid of the light permanently.

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Two Yeets said:

If you're stock, I believe it'll put you in limp mode. If you're deleted and tuned, it just gives you a check engine light. Either way, dropping the sensor and letting it sit there will get rid of the light permanently.

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NavyCuda said:

That might be a really good test for v2.30 actually… So I just unplug the level sensor and see what happens?

edited:

Might have to try on the garbage run later today.

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Two Yeets said:

I have this problem on my truck, and fixed it by dropping the sensor and letting it sit there. Unplugging the sensor would produce a completely different code. On stock trucks, an unplugged coolant sensor would not put the truck in limp mode, but still produce a check engine light.

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