[Mybeardrocks]

I changed my water pump and thermostat last weekend after seeing the usual failure codes. After installing, I topped coolant off and ran bleed test. I was able to hear the coolant swooshing thru the system for the first time since I bought this 2009 BMW 328i. Afterwards, I drove to the store (about 3 miles) in silence cause the car ran like a dream...super quiet and smooth.

I got what I needed from the store and started the car again. Instantly the low decibel whirling sound was back when I pulled off. That's been an issue since I've owned the vehicle. I figured that was water pump related after seeing others post about it. Ran the bleeding process again to find out it wasn't working anymore. There's a stream of coolant running back to the reservoir but no whooshing sound. Scanned vehicle to get speed deviation (2e81) and electric cooling pump missing (2e85). After feeling defeated, I called it a night.

The next day I removed the water pump connector to clean old oil buildup from it. Used a voltmeter to check power wire with engine off. Unfortunately, I failed to get reading on communication wire. Then checked the power distribution tabs on the battery and everything read 12.4 volts. I located fuses and they all seem to be intact.

Today, I've checked fuses and power distribution for voltage again and ran another scan. Here's what came up this time:

DME/DDE (Engine electronics):
Error code: 2E98
BSD, message; alternator: Missing, Fault currently not present, Missing, Fault does not activate warning light
Environmental conditions:
- Frequency: 11
- SAE fault code: U1132
- Logistics counter: 40
- Mileage/km reading: 207984 km | 208016 km | 208152 km
- Time since end of starting: 0 s | 0 s | 0 s
- Manufacturer code, generator 1: 255 - | 0 - | 255 -
- Identification, generator type, generator 1: 255 - | 6 - | 255 -
- Battery voltage: 13.57 V | 13.57 V | 13.57 V

DME/DDE (Engine electronics):
Error code: 2E85
BSD, message; electric coolant pump: Missing, Fault currently not present, no emergency operation signal at coolant pump, Fault does not activate warning light
Environmental conditions:
- Frequency: 20
- Logistics counter: 40
- Mileage/km reading: 207984 km | 208032 km | 208152 km
- Engine speed: 1024 1/min | 1760 1/min | 704 1/min
- Coolant temperature OBD: 31 °C | 94 °C | 71 °C
- Status, engine control: SYN_ENG_IGK_ON 0-n | SYN_ENG_IGK_ON 0-n | SYN_ENG_IGK_ON 0-n
- Voltage, term. 87: 13.71 V | 13.71 V | 14.32 V

DME/DDE (Engine electronics):
Error code: 2E81
DME: Electrical coolant pump, speed deviation, Fault currently not present, Coolant pump speed outside of tolerance, Fault does not activate warning light
Environmental conditions:
- Frequency: 2
- Logistics counter: 39
- Mileage/km reading: 208024 km | 208088 km
- Coolant temperature OBD: 99 °C | 99 °C
- Water pump, voltage: 14 V | 13.8 V
- Water pump, speed: 60 - | 115 -
- Water pump, speed, set point/actual-value difference: 190 - | 115 -

DME/DDE (Engine electronics):
Error code: 2E83
DME: Electric coolant pump, power-reduced operation, Fault currently not present, coolant pump supply voltage too low, Fault does not activate warning light
Environmental conditions:
- Frequency: 21
- Logistics counter: 40
- Mileage/km reading: 208032 km | 208048 km | 208152 km
- Coolant temperature OBD: 94 °C | 72 °C | 80 °C
- Water pump, voltage: 0 V | 0 V | 0 V
- Water pump, temperature, electronics: -50 °C | 18 °C | -50 °C
- Water pump, power-reduced: 50 % | 50 % | 50 %

DME/DDE (Engine electronics):
Error code: 2E8B
BSD, message; intelligent battery sensor (IBS): Missing, Fault currently not present, upgraded communication, malfunction, Fault does not activate warning light
Environmental conditions:
- Frequency: 12
- SAE fault code: P150A
- Logistics counter: 40
- Mileage/km reading: 208048 km | 208064 km | 208152 km
- Status, engine control: SYN_ENG_IGK_ON 0-n | SYN_ENG_IGK_ON 0-n | SYN_ENG_IGK_ON 0-n
- Ambient temperature: 13.5 °C | 6.75 °C | 18.75 °C
- Battery voltage measured by IBS: 13.94 V | 15.09 V | 14.58 V
- Voltage, term. 87: 13.61 V | 13.71 V | 13.81 V

DME/DDE (Engine electronics):
Error code: 2E9F
DME: Oil condition sensor, Fault currently not present, Fault does not activate warning light
Environmental conditions:
- Frequency: 2
- SAE fault code: P1586
- Logistics counter: 40
- Mileage/km reading: 208064 km | 208152 km
- Engine speed: 704 1/min | 704 1/min
- Engine status: IS 0-n | IS 0-n
- Status, engine control: SYN_ENG_IGK_ON 0-n | SYN_ENG_IGK_ON 0-n
- Voltage, term. 87: 13.81 V | 14.32 V

DME/DDE (Engine electronics):
Error code: 2DEC
DME: Power management, battery, Fault currently not present, Exhaustive discharge, Fault does not activate warning light
Environmental conditions:
- Frequency: 5
- SAE fault code: P160A
- Logistics counter: 40
- Mileage/km reading: 208072 km | 208152 km | 208152 km
- Status, stationary load/consumer registered, part 1: 0 - | 0 - | 0 -
- Status, stationary load/consumer registered, part 2: 128 - | 128 - | 128 -
- Battery voltage measured by IBS: 15.09 V | 14.13 V | 14.58 V
- Engine switch-off time: 0 min | 0 min | 0 min

DME/DDE (Engine electronics):
Error code: 2E7C
BSD bus Communication fault, Fault currently not present, Communication fault, Fault does not activate warning light
Environmental conditions:
- Frequency: 1
- SAE fault code: U119D
- Logistics counter: 39
- Mileage/km reading: 208072 km
- Engine speed: 2048 1/min
- Voltage, term. 87: 13.51 V
- Vehicle speed: 96 km/h
- Status, engine control: SYN_ENG_IGK_ON 0-n

DME/DDE (Engine electronics):
Error code: 2E84
BSD, message; electric coolant pump: Missing, Fault currently not present, communication with coolant pump faulty, Fault does not activate warning light
Environmental conditions:
- Frequency: 1
- Logistics counter: 39
- Mileage/km reading: 208088 km
- Engine speed: 640 1/min
- Coolant temperature OBD: 53 °C
- Status, engine control: SYN_ENG_IGK_ON 0-n
- Voltage, term. 87: 13.71 V

DME/DDE (Engine electronics):
Error code: 2EF4
DME: Map thermostat, mechanism, Fault currently not present, jammed open, Fault can activate a warning light (emission warning light or engine warning symbol)
Environmental conditions:
- Frequency: 1
- SAE fault code: P0128
- Logistics counter: 40
- Mileage/km reading: 208104 km
- Ambient temperature: 19.5 °C
- Engine temperature during start: 20.25 °C
- Coolant temperature, radiator outlet: 77.25 °C
- Engine speed: 2144 1/min

EGS (Transmission control):
Error code: 578E
EGS: Gearbox oil: wear, Fault currently present, Lifetime exceeded, Fault would not cause a warning lamp to light up
Environmental conditions:
- Frequency: 41
- Mileage/km reading: 207832 km | 207832 km | 208152 km
- Power supply: 13.6 V | 9.6 V | 9.7 V
- Transmission control unit temperature range: 50°C <= T < 70°C 0-n | 50°C <= T < 70°C 0-n | 10°C <= T < 20°C 0-n
- Transmission temperature range: 35°C <= T < 50°C 0-n | 50°C <= T < 70°C 0-n | 20°C <= T < 35°C 0-n
- Input speed, gearbox (raw value): 608 1/min | 0 1/min | 96 1/min
- Output speed, gearbox (raw value): 0 1/min | 0 1/min | 0 1/min

FRM (Driver's side footwell module):
Error code: A8AC
FRM: Side marker light, left faulty, Fault currently present, Open circuit
Environmental conditions:
- Frequency: 4
- Mileage/km reading: 208056 km
- Battery voltage: 14.33 V

FZD (Function centre, roof):
Error code: A66A
FZD: Reading light, front left, Fault currently not present, Open circuit

FZD (Function centre, roof):
Error code: A670
Fehler Beschlagsensor 0xA670, Fehler momentan nicht vorhanden, aber bereits gespeichert

JBBF (Junction Box electronics):
Error code: A6CF
JBE: AUC sensor, Fault currently present, Fault, sensor
Environmental conditions:
- Frequency: 26
- Logistics counter: 40
- Mileage/km reading: 208152 km
- Vehicle speed: 0 km/h
- Battery voltage: 13.98 V
http
JBBF (Junction Box electronics):
Error code: 9C69
JBE: Rear-cabin stratification adjuster, Fault currently not present, Signal above threshold
Environmental conditions:
- Frequency: 34
- Logistics counter: 10
- Mileage/km reading: 207952 km
- Vehicle speed: 0 km/h
- Battery voltage: 13.29 V

KOMBI (Instrument cluster):
Error code: A559
Dashboard: Voltage supply has been switched off (standby current cutoff relay), Fault currently not present, no matching fault symptom
Environmental conditions:
- Frequency: -1
- Mileage/km reading: 207984 km
- Power supply: 12.8 V

I'm not sure what to do so any help is welcomed.

[Mcnelly]

Have you had any luck? I got a 08 328i when I first got it (6months ago) the PO said it overheats. Never experienced it.. till I did. So I replaced just the pump(6days ago) as the codes said it was missing. Drove just fine till yesterday it decided to overheat again. It’s like it only works when it wants to.

Would anyone happen to know what the water pump and tstat should read at the connector? Off and during bleeding process??

[Mybeardrocks]

Originally Posted by Mcnelly

Have you had any luck? I got a 08 328i when I first got it (6months ago) the PO said it overheats. Never experienced it.. till I did. So I replaced just the pump(6days ago) as the codes said it was missing. Drove just fine till yesterday it decided to overheat again. It's like it only works when it wants to.

Would anyone happen to know what the water pump and tstat should read at the connector? Off and during bleeding process??

Nope, no luck just yet. I've never experienced overheating, just the codes listed above. My connector read the same as my battery with the engine off. I read somewhere that the Communication wire should ready 7 or 8 volts when the ignition is on though

[Sunset rider]

Hi, recently joined and need to reply to one post. Thankfully, this is similar/close to my issue. I am happy to repost in new thread...when allowed....in the meantime...

I have a recetly new to me 2013E92 335i N55.
Warning "Coolant Too Low"
Recently (last Friday) changed the Thermostat and Coolant reservoir (evidence of reservoir leaking. Not really used the car much during weekend.
Today after driving some 50kms "Low Coolant" message appears again along with warning light.
Drove about 2kms to Indy and slightly topped coolant again.
Ran the Bleed procedure twice.
Car was cooled down and when started again...."low Coolant" message came on as well as warning light.
Allowed car to cool down again and check coolant level...was exactly where it should be.
No Failure Codes for Water Pump or Thermostat.
As discussed with original PO, my oil temp seems to be at the normal range when light and message cme on.

Potential issue I coulnt understand....
1. if you turn ignition on (not engine running)....water pump and circulates well....no air pockets etc
2. If you start engine....water pump stops circulating water (cant understand that one in particular)
3. Even when cooled down....the " Coolant too low" message and light stays on....

Is there a coolant reset button?
Why would the pump operate (quite well)durin the Bleed process and not when engine running???

Any views/advice welcome.

[e91Owner]

Originally Posted by Sunset rider

Hi, recently joined and need to reply to one post. Thankfully, this is similar/close to my issue. I am happy to repost in new thread...when allowed....in the meantime...

I have a recetly new to me 2013E92 335i N55.
Warning "Coolant Too Low"
Recently (last Friday) changed the Thermostat and Coolant reservoir (evidence of reservoir leaking. Not really used the car much during weekend.
Today after driving some 50kms "Low Coolant" message appears again along with warning light.
Drove about 2kms to Indy and slightly topped coolant again.
Ran the Bleed procedure twice.
Car was cooled down and when started again...."low Coolant" message came on as well as warning light.
Allowed car to cool down again and check coolant level...was exactly where it should be.
No Failure Codes for Water Pump or Thermostat.
As discussed with original PO, my oil temp seems to be at the normal range when light and message cme on.

Potential issue I coulnt understand....
1. if you turn ignition on (not engine running)....water pump and circulates well....no air pockets etc
2. If you start engine....water pump stops circulating water (cant understand that one in particular)
3. Even when cooled down....the " Coolant too low" message and light stays on....

Is there a coolant reset button?
Why would the pump operate (quite well)durin the Bleed process and not when engine running???

Any views/advice welcome.

The coolant level is measured in the reservoir. There is a sensor at the bottom that you should be able to see from outside of the tank. I would make sure that the connection is secure. If the level is fine visually in the tank and you are still getting this message, the sensor itself may be bad.

[bluewater328]

Originally Posted by e91Owner

The coolant level is measured in the reservoir. There is a sensor at the bottom that you should be able to see from outside of the tank. I would make sure that the connection is secure. If the level is fine visually in the tank and you are still getting this message, the sensor itself may be bad.

I've also seen the float get stuck/disconnected. So it could be just the reading since you're not overheating. Check the reservoir out and maybe the sensor...those items are actually not too expensive to just swap if needed.

Obviously make sure you've bled it out again.

[Sunset rider]

Originally Posted by e91Owner View Post
The coolant level is measured in the reservoir. There is a sensor at the bottom that you should be able to see from outside of the tank. I would make sure that the connection is secure. If the level is fine visually in the tank and you are still getting this message, the sensor itself may be bad.
I've also seen the float get stuck/disconnected. So it could be just the reading since you're not overheating. Check the reservoir out and maybe the sensor...those items are actually not too expensive to just swap if needed.

Obviously make sure you've bled it out again.

Thank you for the reply. Reservoir/tank is new. I will check sensor later this morning when I get to the Indy.

Any suggestion as to why the pump cuts out when engine is switched on?

[e91Owner]

Originally Posted by Sunset rider

Thank you for the reply. Reservoir/tank is new. I will check sensor later this morning when I get to the Indy.

Any suggestion as to why the pump cuts out when engine is switched on?

I'd have to see what happens with my car. That may be entirely normal. The flow is less at at lower engine temperatures.

[conraja]

Hey just read your post and I am curious if you ever figured out the problem. I have alot of the same faults and it is really starting to bug me because I can't figure it out. I have the following faults 2E81, 2E83, 2E85, 2E8B, 2E98. Which is the electrical coolant pump speed deviation, electric coolant pump power reduced operation, electric coolant pump missing, intelligent battery sensor missing, alternator missing. I've reset codes and they come back. I have a brand new battery, replaced ibs all new, alternator is 2 yrs old and water pump is 2 yrs old.

[rt7085]

It looks like the BSB (Bit Serial Bus) is not able to communicate to all these devices listed and as such it will start logging (default) faults for all of them. I noticed that when installing the water pump, you have to be very careful routing and positioning the harness of the pump and thermostat back in the original location. The harness is clipped to the lower mount of the water pump with a small spring which you need to transfer from the old to the new pump. It is easy to pinch the harness between the motor block and the pump when you are not careful, potentially shorting a wire to GND (engine/pump metal). It is also possible to put tension on the harness when not installed right, possible breaking wires internal to the plastic shroud. And there is co-located a GND (?) connection at the end of the harness near the pump that may have been compromised. Any of these issues will compromise the BSB I suspect.

[Phangnga]

Youtube videos describing the electric water pump bleeding procedure (for my 07 X3 E83) are not clear as to radiator cap on or cap off during this procedure.

I tried "cap off" and had a fountain of coolant and a mess on the garage floor.

I just installed the new pump and thermostat (FCP Euro), and will now flush with distilled, fill with BMW Blue 60-40, and run the bleeding procedure with "cap on."

Your thoughts, please?