P00B7 error code help

627 Views 12 Replies 6 Participants Last post by darkgenerals, 29 d ago

darkgenerals

Discussion Starter · 1 mo ago

Currently fighting a P00B7 (ECM-Engine Coolant Flow Low/Perf) engine light. I've seen several threads mention a leak in the EGR system. Truck is currently deleted with Wheeler's kit and I have tiny leak at the reroute plate. Like just leaving blue gunk around one side of the mating surface. My plan this weekend is to reseal and correct the leak, but my question is how big of a leak does the ECM need to throw the P00B7 code or is there something else worth looking into?

Does the engine have a coolant flow sensor inside the return inlet on the overflow tank? I've also seen several threads mentioning the level sensor failing but the truck isnt going into limp mode, or and kind of weird power reduced mode. Coolant is up to the full mark on the overflow tank.

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Two Yeets

· #2 · 1 mo ago

Chances are your resevoir sensor is bad. You can fix that for free by doing what this guy did. I had the same code pop up 2.5 years ago, right as my kid was born, and this trick fixed it. No coolant codes since then.

Coolant Sensor “Temp” Fix with NO CEL on

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...

www.titanxdforum.com

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darkgenerals

Discussion Starter · #3 · 1 mo ago

Thank you for linking that, I came across it when I first got the code and couldn’t find it. Weirdly the check engine light went off on its own. I’ve never pulled the over flow tank before, is that the only sensor?

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QuikCoastie17

· #4 · 1 mo ago

darkgenerals said:
Thank you for linking that, I came across it when I first got the code and couldn’t find it. Weirdly the check engine light went off on its own. I’ve never pulled the over flow tank before, is that the only sensor?

My CEL came and went too. But it was that sensor.

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Wheeler

· #5 · 1 mo ago

I had same issue. Replaced tank & was golden. I did have mine done under warranty last fall.

plz shoot me a text at 1 (780) 265-5862. I’ll send u the gasket picture/dimensions

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darkgenerals

Discussion Starter · #6 · 1 mo ago

i ended up just popping the sensor out of tank for a short term solution. Between yard work, kids, and my other projects I will get it fixed another weekend. The leak is so small that I’ve never seen anything wet, just a little blue crust.

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CPS

· #7 · 1 mo ago

It is the coolant tank level sensor that goes bad on almost all of these truck. The dealership is aware and the new coolant tanks are the newer upgraded models (they have a different sensor in them).

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darkgenerals

Discussion Starter · #8 · 1 mo ago

do you happen to have a part number? I’m curious what the cost is.

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CPS

· #9 · 1 mo ago

I will get it off the invoice when I get home. I didn’t cost me anything because it was under warranty. But I should be able to get the part number and figure it out. I know it’s not cheap

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CPS

· #10 · 1 mo ago

This is the part number from the warranty repair invoice from Nissan:
21710-ez40a

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darkgenerals

Discussion Starter · #11 · 1 mo ago

Thank you for the part number. Not bad on the price, z1 off-road has them for 124 but are on back order. I may just order one because my tank is super discolored and has micro cracks forming near the joints.

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