[Shane Hanson]

I just replaced my water pump and thermostat on my n54. After the install and bleeding procedure the car runs fine the fan isn’t on full blast and coolant temps are in the normal range but the car is still throwing the 2E81 - DME: Electrical coolant pump, speed deviation code and I can’t figure out why unless the pump was bad from the factory, any advice would be appreciated.

[Efthreeoh]

Just clear the code. When you replace electrical components that cause a problem code, you are supposed clear the code before replacing the part.

[Shane Hanson]

Originally Posted by Efthreeoh

Just clear the code. When you replace electrical components that cause a problem code, you are supposed clear the code before replacing the part.

I did clear the code before and I have cleared it several times after the install and it keeps coming back.

[Efthreeoh]

Sounds like a faulty pump. Have you used your scan tool to test it?

[Shane Hanson]

Originally Posted by Efthreeoh

Sounds like a faulty pump. Have you used your scan tool to test it?

I have, the only code it’s throwing is the 2E81, it’s not throwing 2E82 - DME: Electric coolant pump, cutoff like it was before I replaced it.

[headsupsticksdown]

I’ve been having a similar issue after just swapping out my pump (Pierburg) and thermostat on an E70/N52. I’ve battled a leak from a bad position on the clamp for the C hose between the thermo and pump that had me dumping in an additional 2 jugs of coolant; didn’t see the leak until I popped the car up (no coolant on the ground). I also got the lost connection error to the pump as well so I thought the plug to the pump just got drenched in coolant from the leak so I sprayed it down with contact cleaner and also noticed that the plug wasn’t entirely in (I could pull it out fairly easier). Pushing it in with just my hand wouldn’t click it in so I used a flathead and thought things were good. No threshold or communication errors this AM until about an hour ago I notice temps going up and after scanning for errors the 2E81 showed up again. Cleared it and now I’m fine..

I’m gonna pop the car back up to see if I can spot anything but if the consensus is that this pump is already bad after only 2 days, I’m going to lose it. Got it through FCP Euro so they’ll ship another one, but you’ve gotta buy it first, then deal with all the downtime until it comes in. Let alone going through this process again of putting it in.

What else can it be?!

[Shane Hanson]

Originally Posted by headsupsticksdown

I’ve been having a similar issue after just swapping out my pump (Pierburg) and thermostat on an E70/N52. I’ve battled a leak from a bad position on the clamp for the C hose between the thermo and pump that had me dumping in an additional 2 jugs of coolant; didn’t see the leak until I popped the car up (no coolant on the ground). I also got the lost connection error to the pump as well so I thought the plug to the pump just got drenched in coolant from the leak so I sprayed it down with contact cleaner and also noticed that the plug wasn’t entirely in (I could pull it out fairly easier). Pushing it in with just my hand wouldn’t click it in so I used a flathead and thought things were good. No threshold or communication errors this AM until about an hour ago I notice temps going up and after scanning for errors the 2E81 showed up again. Cleared it and now I’m fine..

I’m gonna pop the car back up to see if I can spot anything but if the consensus is that this pump is already bad after only 2 days, I’m going to lose it. Got it through FCP Euro so they’ll ship another one, but you’ve gotta buy it first, then deal with all the downtime until it comes in. Let alone going through this process again of putting it in.

What else can it be?!

I jacked my car back up today to see if all my connections were good and my ground wire wasn’t fully tightened so I tightened it back up and codes gone and it’s all good now.

[headsupsticksdown]

Originally Posted by Shane Hanson

I jacked my car back up today to see if all my connections were good and my ground wire wasn’t fully tightened so I tightened it back up and codes gone and it’s all good now.

Lucky you!! I rechecked my plug, which seemed fine, then ran the bleed procedure and disconnected my battery for a bit for the heck of it. Weird thing is now my battery is showing at 98% in BimmerLink when prior to disconnecting, it would rarely show more than 78%…

I hope my 2E81 doesn’t return…

[Shane Hanson]

Originally Posted by headsupsticksdown

Lucky you!! I rechecked my plug, which seemed fine, then ran the bleed procedure and disconnected my battery for a bit for the heck of it. Weird thing is now my battery is showing at 98% in BimmerLink when prior to disconnecting, it would rarely show more than 78%…

I hope my 2E81 doesn’t return…

Yea I got lucky thought it was a faulty pump but wanted to double check before I reached that conclusion, maybe your battery terminals weren’t on all the way so the car wasn’t reviving full power but that seems like a long shot. My guess is it has to be some electrical component because 2e81 is saying the pump won’t run at the speed the dme wants it to but if all your plugs are good and so is the ground you might be unlucky and revived a faulty pump, I bought an all aluminum peirberg pump as well hope it all works out for you