BMW Micro Power Module MPM Problems
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The Micro Power Module sits in the spare wheel well on many BMW F series cars, which is exactly where water collects if the trunk leaks. Check that first, because a wet MPM produces a long list of unrelated electrical symptoms, and fitting a new one without finding the leak simply drowns the replacement.
At a Glance
- What the MPM does: the Micro Power Module manages the rear power distribution and the sleep and wake behavior of the car. On many BMW F series models it sits in the rear, under or behind the trim.
- Classic symptoms: overnight battery drain, modules that will not go to sleep, tailgate and rear light faults, and intermittent no start after the car sits.
- Most common cause of failure: water intrusion. The MPM is low in the body and a blocked drain or a leaking seal puts water straight into it.
- Before blaming the MPM: test the battery and confirm it is registered. A tired or unregistered battery produces the same drain complaint.
- Cost: $250 to $600 rebuild. $700 to $1,500 new with coding.
Many BMW 5 and 6 Series have a Micro Power Module (MPM) to power the iDrive, Radio, Navigation, and the LCD screen on the dashboard. BMW MPM module can fail to cause the following symptoms.
The BMW MPM module is responsible for your entertainment, communication, and navigation system. It also turns ON/OFF your electrical systems and puts them to sleep. Because BMW decided to install it in the trunk, it is a common problem when the MPM module gets wet and shorts out.
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Troubleshooting BMW Micro Power Module MPM Problems
Symptoms
When the MPM module is damaged, your display screen, door chime, and radio will stop working.
- iDrive will not start
- Battery drain when the car is parked
- CCC will not power up
- DVD slots lights (only) turn
- No chime when you open the door
- The navigation screen does not turn on.
- Failure of Audio System and Body Control devices
Problem
Unfortunately, BMW installed this module in the vehicle’s trunk below the spare tire. If water or fluids leak in your trunk, they will end up at the bottom of the spare tire well, where the MPM module is located. Fluids can easily enter the MPM box, causing your BMW radio to shut down and never turn on again.
Solution
To fix this problem, you will need to replace the MPM module. In our case, we tried drying the module, but it still didn’t work. Replacing the module is very simple. Unplug the old BMW MPM module and plug in the new one. It does not need any programming. You can buy a BMW MPM Module online. Make sure to relocate the MPM module to another place where water or spilled fluids can’t get it so easily.
Applications
Below is a list of BMW models that may be affected by the MPM problem. There may be other problems as well.
Series
- 5 Series
- 6 Series
- Models
- 525
- 530
- 545
- 650
- M5
Chassis
- E60
- E61
- E63
- E64
Related Part Numbers
This is a partial list of BMW MPM module part numbers.
- 61.35-9 266 274
- 61356937010
- 61356938358
- 61356939655
- 61356982347
What This Repair Costs
| Repair | Typical total cost |
|---|---|
| Battery test and registration | $50 to $200 |
| Parasitic drain diagnosis | $120 to $350 |
| MPM rebuild using your original unit | $250 to $600 |
| New MPM plus coding | $700 to $1,500 |
| Water leak repair, drains and seals | $150 to $500 |
Rough US estimates for planning, not quotes. Prices vary widely by model, parts brand and region, so get a written quote before committing.
If water got in, fix the leak before fitting a replacement. A new module in a wet location fails the same way, usually within a year.
When to Stop and Hand It Over
- The drain is intermittent and only appears after the car has sat for hours. Finding that needs a proper current draw test over a sleep cycle.
- Coding is required after replacement.
- You find corrosion inside the module or standing water in the spare wheel well.
Confirming the MPM Before Replacing It
A battery drain complaint has many causes and the MPM is only one of them. A generic OBD2 reader sees none of them, because power management and body modules are not emissions modules.
The YOUCANIC UCAN-II Pro reads all BMW modules including the power management system, shows battery and charging data, and performs battery registration. Start there. If the battery is old or was never registered, that is both the cheapest and the most likely answer, and you will have ruled it out in minutes.
Where the MPM is confirmed, a rebuild of your original unit through a specialist such as Module Medics avoids the coding charge and is typically less than half the price of a new module.
Frequently Asked Questions
What does the BMW Micro Power Module do?
It manages power to the rear electrical systems and helps control the battery circuit. When it fails it can cause battery drain, a no start or random electrical faults.
Can a bad MPM drain the battery?
Yes. A faulty module can keep circuits awake after the car is locked, so the battery goes flat overnight or over a few days.
Do I need coding after replacing the MPM?
On many models the new module needs to be programmed or coded to the car. Check the procedure for your model before ordering parts.
Check these troubleshooting and repair guides for more help on your BMW.
DVD cd and gear box led stays on
Not going to sleep when car is turned off .
Checked module in boot it’s fine
Problem not going away .
Rain water in boot all dried
Out still have problems
Call the dealer and they can tell you all the part numbers that will fit.
hey,
I have a bmw 520i 2003/2004 and my mpm is damage, it took in water. My problem now is to find the exact part to it. It is very difficult to find for I have search online and cannot match it. My mpm part 61356982347-01and my question is there a part parallel to this that I can buy?