Fuel pump control electronics, internal fault error at track day

[Subydude]

I ran the car for the first time on track yesterday and had an odd error pop up. I was in the 3rd session of the day and 8th lap of the session on a 1:40ish lap average when the car stumbled slightly coming out of a corner. I felt no real loss of power after, and everything seemed normal so I kept going. Shortly after there was a black flag all for an off so we all went onto pit road. I saw the CEL was illuminated and figured it must have been something with that stumble.

At the time I didn't have Bimmerlink or my normal scan tool so I thought it might have been fuel starve. I had been filling the car before each session and it was using about 4 gallons per. I bought Bimmerlink shortly after realizing my old scan tool wouldn't read the BMW stuff properly.

11B012 was the code per Bimmerlink which translates to "Fuel pump control electronics, internal fault: Temperature threshold 2 exceeded". There's very little online about that error, and taking the car out after I got home showed it was performing normally. While it was a warm day (88 F ambient) I wouldn't expect any electronics to overheat.

Car is stock powertrain/transmission/diff wise with only minor suspension mods done. 2026 with about 1,500 miles on it.

Has anyone seen this issue before?

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[itzTang]

Did you take the corner too hard and starved the pump for a bit?

 

[Subydude]

I only felt the car stumble once and it was for less than a second. It would seem odd for that to cause it. The car had 5 bars of fuel still, but likely around 4 gallons down from full. I’d think if the pump and not the controller was overheating that we’d see other people with the same code a lot.

I’ve cleared the code and drove it for 20ish miles today. No issues so far and it seems as good as it was before. I’ll see if it comes back during the next track day next month.

 

[lucky phil]

I only felt the car stumble once and it was for less than a second. It would seem odd for that to cause it. The car had 5 bars of fuel still, but likely around 4 gallons down from full. I’d think if the pump and not the controller was overheating that we’d see other people with the same code a lot.

I’ve cleared the code and drove it for 20ish miles today. No issues so far and it seems as good as it was before. I’ll see if it comes back during the next track day next month.

You can buy a used module for around 60usd and try it or have it on hand. Looks a 10 min job to replace in the trunk adjacent to the battery.
Phil

 

[Subydude]

You can buy a used module for around 60usd and try it or have it on hand. Looks a 10 min job to replace in the trunk adjacent to the battery.
Phil

I saw that as well after I did some more looking. I'm going to take a look at it and see if there's something going on that's obvious first.

If it happens again I'll know I can clear it and continue on, but I'll also take it in to use the warranty. Depending on the part, I try to use the warranty until it's obviously not going to go anywhere. New prices seem to be around $250 for it, and if there's an actual issue I'd like a new module before used.

 

[PikkaGTR]

It's the EKPM module, and BMWs have been known to have these overheat and even cause the car to shut down. Look into a 3d printed solution with heatsink and fan by Arc Terminator

 

[Subydude]

It's the EKPM module, and BMWs have been known to have these overheat and even cause the car to shut down. Look into a 3d printed solution with heatsink and fan by Arc Terminator

Interesting! The fact it's called something else in BMW world makes sense why my general searches didn't pop anything up.

I was planning on looking at the module to begin with, so knowing there are ready made 3d prints and plans to cool it are nice.

A bit more looking, it appears you can install used ones, but unless it's the same general part number it may need coding to match the duty cycle of the car. I have very little knowledge beyond the 30 minutes I've spent reading, but it appears to be common like you said.

I guess mine must be a little on the weaker side, or it was just hot enough that day on a nascar roval to push the piece to an overheat situation. I'm just glad it's a relatively easy fix and something I can print up in a few hours.

 

[Rizen]

Interesting! The fact it's called something else in BMW world makes sense why my general searches didn't pop anything up.

I was planning on looking at the module to begin with, so knowing there are ready made 3d prints and plans to cool it are nice.

A bit more looking, it appears you can install used ones, but unless it's the same general part number it may need coding to match the duty cycle of the car. I have very little knowledge beyond the 30 minutes I've spent reading, but it appears to be common like you said.

I guess mine must be a little on the weaker side, or it was just hot enough that day on a nascar roval to push the piece to an overheat situation. I'm just glad it's a relatively easy fix and something I can print up in a few hours.

If you do ever end up having to change it out and need coding support, you can borrow my tablet with Protool.

 

[razorlab]

It's the EKPM module, and BMWs have been known to have these overheat and even cause the car to shut down. Look into a 3d printed solution with heatsink and fan by Arc Terminator

Those are for the older modules. The G series don't have that common issue.

With some codes with bmw, what happened and why it tripped it might be different than what the code says. VANOS is a great example. If you overrun the HPFP at high engine speeds, then shift, you get a VANOS clamp code that states VANOS is out of spec, when in reality, it was the HPFP getting overrun and shutting down, thus putting a different load on the cam, which trips the VANOS code.

 

[Subydude]

Either way, the path forward is go to the next event and see if it happens again. In the meantime I'll look at the module and see if there's any obvious issues with it. The print is "free" and I can look at a fan for it just in case.

 

[FLtrackdays]

I ran the car for the first time on track yesterday and had an odd error pop up. I was in the 3rd session of the day and 8th lap of the session on a 1:40ish lap average when the car stumbled slightly coming out of a corner. I felt no real loss of power after, and everything seemed normal so I kept going. Shortly after there was a black flag all for an off so we all went onto pit road. I saw the CEL was illuminated and figured it must have been something with that stumble.

At the time I didn't have Bimmerlink or my normal scan tool so I thought it might have been fuel starve. I had been filling the car before each session and it was using about 4 gallons per. I bought Bimmerlink shortly after realizing my old scan tool wouldn't read the BMW stuff properly.

11B012 was the code per Bimmerlink which translates to "Fuel pump control electronics, internal fault: Temperature threshold 2 exceeded". There's very little online about that error, and taking the car out after I got home showed it was performing normally. While it was a warm day (88 F ambient) I wouldn't expect any electronics to overheat.

Car is stock powertrain/transmission/diff wise with only minor suspension mods done. 2026 with about 1,500 miles on it.

Has anyone seen this issue before?

Did you turn the nannies off? The car will try to stabilize (obviously) when driven hard on track and pause in a corner (grabbing the brakes). I’ve forgotten a few times & have to slow down (or pull in) & mash the big off button on our cars.

Also, do you have a JB4? Even when it’s 88F ambient temp out, the track temps will be way hotter. It adds up especially after a few sessions and as the day goes on. Food for thought.

 

[Subydude]

Did you turn the nannies off? The car will try to stabilize (obviously) when driven hard on track and pause in a corner (grabbing the brakes). I’ve forgotten a few times & have to slow down (or pull in) & mash the big off button on our cars.

Also, do you have a JB4? Even when it’s 88F ambient temp out, the track temps will be way hotter. It adds up especially after a few sessions and as the day goes on. Food for thought.

All nannies off every session. And the car is completely stock driveline wise. I'm very comfortable driving sideways and the car was quite happy to gently rotate if I squeezed throttle a bit too much so I know it was off.

Having raced cars without AC in endurance series some years ago I definitely agree that ambient is not on track temp. That third session it was a bit hotter than the other two, and I'm not known for mechanical sympathy while driving. I imagine after 8 hot laps it simply overheated.

I pulled the FPC out of the back to look at it. Ended up tweaking one of the prints for the earlier F30 BMW module that had more issues so I could put a small 40mm fan in the housing that fit the Supra. Once I have it in place and tested I will post the print in the 3d print thread. The location for the FPC is pretty shit given the exhaust is under it and it's got multiple layers of insulation in the form of carpet above it.

I think all in for the print, fan, and fuse taps will be less than $20. I also don't think this will be a problem for people who take cool down laps, or on tracks with less full throttle.

 

[razorlab]

I really think you are chasing the wrong thing but I could always be wrong. I've never heard of this issue in a modern G/J-series.

I personally have never had an issue, even lapping for full 30 mins, a ton of full throttle and even full throttle to 147mph+ in the straight every 50 secs or so, in 80F+ ambient, 600whp+, ethanol mix.

Four seasons of tracking this Supra with 20+ events each season.

 

[Subydude]

I really think you are chasing the wrong thing but I could always be wrong. I've never heard of this issue in a modern G/J-series.

I personally have never had an issue, even lapping for full 30 mins, a ton of full throttle and even full throttle to 147mph+ in the straight every 50 secs or so, in 80F+ ambient, 600whp+, ethanol mix.

Tracking in the SE is not like tracking in the NE. 80F+ ambient is late October to early November here. 147 in a straight also depends on what your starting speed was, because if you're referencing LRP then isn't the starting speed around 90ish? CMS has the entry to the banking at 40ish mph to 135 down to 45ish for the bus stop back to 125, rinse and repeat. The delta is what matters for a straight speed, not the overall top speed (usually).

I don't know if I'm chasing a phantom or not, but I do know this sub $20 test will tell me if I'm on the right track. It's a pretty simple system given there's a commanded duty cycle and the power flows through the FPC to the fuel pump itself. If the fuel pump has a fault inside then it'll show up as over heating again. If not and it was just the general heat along with a track that has a lot of full throttle for a long time then this should fix the issue (for me).

A few other things I realized at the time was I hadn't removed the carpet mat in the trunk area, or the little package shelf over the battery. I left the windows down between sessions, but with the sun shining it was easily over 110-120 in the car when I'd get back in. My little bit of searching says 150 F is where the board starts giving errors (based on the older EKPM stuff, no clue if it relates to this). That's not a ton of buffer, especially in the hatch area where there's very little air flow.

 

[razorlab]

Tracking in the SE is not like tracking in the NE. 80F+ ambient is late October to early November here. 147 in a straight also depends on what your starting speed was, because if you're referencing LRP then isn't the starting speed around 90ish? CMS has the entry to the banking at 40ish mph to 135 down to 45ish for the bus stop back to 125, rinse and repeat. The delta is what matters for a straight speed, not the overall top speed (usually).

Lol, okay.

One LRP lap in my supra is basically this for 56 seconds, over and over and over again with no rest, in a 600whp+ Supra with ethanol:

Braking from 148 mph to mid 60 mph, WOT to mid 80 mph, braking to low 60 mph, WOT to 122 mph, braking to mid 80 mph, WOT to 115 mph, braking to approx 98mph, WOT to 148 mph.

If that isn't enough WOT for 20-30 minutes and 15+ laps per session for you then we can use Pocono which is 55mph to 130mph and 60mph to 158mph in the two biggest WOT sections, and a bunch of other WOT moments per lap.

But yea, totally different. Good luck with your arts and crafts project.

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