BMW Drivetrain Malfunction: Is It Safe to Keep Driving?

You are doing 70 mph in a 2014 BMW 320d when the dash shows Drivetrain malfunction and the car pulls less hard than a minute ago. Take the next exit and slow down: you can usually drive gently to a workshop, with the exceptions below.

Is it safe to drive with a BMW drivetrain malfunction message?

Usually yes, if you drive gently and get the codes read soon. On 2020-2021 G-series cars with the 48 V mild-hybrid battery, the car itself says so: "You can continue to drive. No roadside assistance necessary. To avoid subsequent damage, arrange an appointment with your Service Partner" (BMW service bulletin 61 09 21).

That wording does not fit every car. BMW's 2018 recall of the F90 M5 describes a software error behind the Drivetrain Malfunction message, with the engine light on: the fuel pressure can drop, causing a power loss and possibly engine stalling while driving (SI B16 06 18). The message differs by model and software level, so the display alone cannot tell you how serious it is. Drive gently and get it read soon.

Four things change the answer:

• The check engine light is flashing. BMW's X4 owner's manual says a flashing light means excessive misfiring. It says to reduce the vehicle speed and have the system checked immediately, because serious misfiring within a brief period can damage the catalytic converter.
• The temperature indicator shows a hot engine. Pull over and switch off. Do not open the coolant cap on a hot engine: the manual warns that coolant can escape and scald.
• The engine stalls. Pull off the road to a safe place and do not drive on. BMW's 2018 M5 recall notice tells owners exactly that, and to call roadside assistance.
• A red warning appears with it. Treat any red light as stop first, read later.

Two of these are BMW's own words: the X4 manual for the flashing light, and the M5 recall notice for a stall. Stopping for a hot engine or a red light is this post's own advice, not a quote from BMW. If none of these apply, avoid hard acceleration and go straight home or to a workshop.

What does it cost to fix?

These are all-in euro prices at an EU independent workshop, VAT included, taken from published repair-cost ranges; a dealer or a US shop will charge differently. The cause decides the bill.

A diagnosis is 30-80 euros at an independent workshop and 80-150 euros at a dealer. Two things move the number: whether the cheap causes were ruled out before a part was ordered, and whether the car needs a BMW-only tool to read the fault.

What should you do right now?

1. Pull over safely, and if the engine did not stall, restart it once after a minute. One BMW bulletin (12 31 16) describes a fault where the engine runs normally again after the ignition is cycled. A cleared message is not a fixed car: the fault stays stored. If the engine stalled, leave it off and call roadside assistance.
2. Note what the car was doing. Was it under hard acceleration or on a cold start? Write down the exact message too. On newer BMWs the manual says stored messages sit under CAR, Vehicle status, Check Control messages.
3. Get the engine codes read. Any 15 to 30 euro Bluetooth ELM327 adapter plugs in under the dash, and an app on your phone reads them in about a minute. A generic scan reads the engine control unit (called DME on petrol BMWs and DDE on diesels). It does not read the gearbox control unit or the other modules. Unplug the adapter before you lock the car: BMW's manual warns that a device left in the diagnostic socket can set off the alarm.
4. Decide with the codes in hand. A misfire or fuel pressure code points at the cheap rows of the table. A voltage code points at the battery. No engine code at all is also an answer: the fault may sit in another unit, or be a software or battery issue.
5. Check your VIN for open recalls. BMW has recalled cars over faults that set this message, such as about 850 model year 2018 M5s in the US for a fuel pump software update (SI B16 06 18). NHTSA's free lookup at nhtsa.gov/recalls covers US cars; elsewhere, ask a BMW dealer to check the VIN.
6. Book the workshop with facts. Give them the exact message and the codes, and say when it appears. Ask them to read every control unit, not just the engine, and to save the fault codes before anything is cleared. On 8-speed automatics, BMW tells its own workshops to print and secure the gearbox fault codes first (bulletin 24 02 13).

A drivetrain message tells you something is wrong, not what, and the engine's own codes are the cheapest way to narrow it down. Skanyx reads them through any 15 to 30 euro Bluetooth adapter and explains each one in plain English, with a green-to-red severity that tells you whether to keep driving. It reads the engine control unit, not the gearbox or the other modules. See what your BMW's engine has stored

What does the message mean, and what causes it?

BMW does not use one fixed text. Its service bulletins show several wordings for the same idea: a control unit stored a fault, and on most of them the car limited its power. These are BMW of North America documents, published through the US regulator NHTSA, so the wording on a European car's display can differ. The cause differs by engine and model:

• "Drivetrain Malfunction": BMW's bulletins tie this exact wording to several faults. On the F87 M2 it was an overly sensitive charging pressure threshold in the engine software (bulletin 12 17 16). On the N55 engine built to March 2012 with the Continental high-pressure fuel pump it was vapor forming in the fuel system, fixed with new engine software and, on older fuel modules, a new low-pressure fuel pump (bulletin 12 05 16). On the G12 7 Series with the N63R engine it was a poorly locked connector or bad pin contacts on the engine wiring harness (bulletin 12 19 16).
• "Engine fault! Power loss": BMW documents it for the F30 and G12 with B58M and N63R engines built to June 23, 2016. DME fault 10170F is set when the engine is not started within 30 seconds of switching the ignition on. The engine runs normally after the ignition is cycled, and reprogramming fixes it (bulletin 12 31 16).
• "Engine fault/reduced power" and "Fuel pump/drive with care": the F80 M3 and the F82 and F83 M4 built from March 2014 to April 2015, with fault 481B05 stored in the electric fuel pump control module (bulletin 16 05 15).
• "Drive faulty; Drive at moderate speed": reduced power when accelerating on the F10 M5 and related M models built to July 1, 2015. The cause was a software error (bulletin 12 23 15).
• "You can continue driving. Drivetrain": the wording on 2020-2021 G-series cars with the 48 V battery, caused by software in the battery control unit.

Owners search for "drivetrain malfunction" and "drive moderately" because the exact words depend on the model and the software. The message names the problem area, not the part. Hex fault numbers are engine-specific, too: BMW's bulletins list 120208 as an exhaust camshaft sensor entry on the F10 M5 but as a charging pressure entry on the F87 M2, and fixed both with software. Never look up a hex number without naming the engine. We built the table below from the BMW bulletins and the owner's manual linked on this page. It pairs each cause family with what a generic scan shows and what a BMW-level scan adds.

Some rows deserve one more line each:

• Battery. None of the BMW bulletins cited here name a weak 12 V battery as a cause of this message, so it is a cheap row to rule out, not a likely answer. A BMW Group bulletin written for MINI says a failed battery is often the symptom, not the cause, and that replacing it fixes the problem permanently only in the rarest of cases. It also warns: "When battery registration or programming is performed, the stored energy history will be deleted" (bulletin 61 06 07). BMW Group's MINI owner's manual adds that once a new battery is registered, related Check Control messages disappear. Ask for the energy diagnosis before a new battery is registered.
• Gearbox. On 8-speed automatics, BMW tells its workshops to check the fluid level first, and that a real engine running problem can also cause shift complaints and must be fixed first (bulletin 24 02 13). Engine codes can matter even when the gearbox is blamed.
• N47 diesel (2007 to 2015). Auto motor und sport says the timing chain often sits on the gearbox side of the engine. It lists a metallic rattle on cold start, a steady engine light and power loss as the signs, and a repair of 1,500-2,500 euros (article). See the N47 engine page.
• Twin-turbo petrol six (N54). In October 2010 BMW recalled about 130,000 cars in the US, from the 2007 335i to the 2010 Z4 sDrive35i, over the high-pressure fuel pump. The notice listed reduced performance with an engine malfunction warning among the signs, and the remedy was a new pump or a software update (BMWBlog).

Related guides: reduced engine power and limp mode cover the same symptom on any car, and BMW fault codes by engine goes deeper, engine by engine.

Codes named in this section: P0300, P0301, P0087, P0299, P0016, P0128, P0562.

Will the message go away on its own, and should you clear it?

Sometimes it goes away after a restart, but the fault stays stored and the message can come back. BMW's manual says some Check Control messages stay on until the fault is eliminated, and that stored messages can be shown again later.

Do not clear the codes to "reset" the warning. Write them down or screenshot them first, because the codes are the clue, and clearing also wipes the snapshot saved with each one. Clear them after the repair, then scan again to confirm the fault stayed away.

Can you fix it yourself, or is this a workshop job?

You can do this at home: get the engine codes read and write down when the message appears. You can also check the coolant level, but only with the engine cold: BMW's manual says to open the cooling system once it has cooled down.

Book a workshop when the engine light flashes or the engine runs hot. Book one too when the gearbox slips, or the cause needs a BMW-only code or a software update. Reprogramming a control unit is workshop work: BMW's own bulletins say to connect an approved battery charger while it runs.

These are the routes for reading the gearbox and the other units, with prices from BimmerLink's App Store page and Carly's own pricing page:

Either way, reading the gearbox and the other units means a workshop visit or a second app and adapter. A fair workshop visit itemises the diagnosis and shows you the stored codes before it orders a part.

Coming to Skanyx: find out which control unit stored the fault

The hard case is a drivetrain message with no engine code behind it, because the fault sits in the gearbox or another control unit. That is the case the new feature is being built for. You will ask in plain words on your iPhone or Android phone why your BMW says drivetrain malfunction. With a Bluetooth OBD2 adapter in the car, the app will read every control unit with the manufacturer's own data, the gearbox included, and show which one stored the fault. It will explain what the fault means and what to check next.

You will not need a laptop or an ENET cable, and the adapters it is tested with will be named before launch. It will cover BMW built from 2007. The full scan will be part of one purchase for BMW that covers every BMW on your account, and the AI that explains the fault will come with Skanyx Pro. What each car can do depends on its model, year and equipment. Join the BMW waitlist and we will send you launch updates for your car.

Before you drive on

Back on that exit ramp in the 320d, the next move is the same for every cause: get the engine codes read before anyone quotes you a part. Note what the car was doing when the message appeared, and take the codes and the exact wording to the workshop. If the engine light starts flashing on the way, slow down and have the car checked at once.