BMW XM Power Loss: Throttle Issues and Limp Mode Mystery

Hey there! I have some experience working on BMWs, had a similar issue with my 2021 BMW X6 M last year. Actually, it turned out to be a faulty accelerator pedal module, same symptoms you're describing: limp mode, high idle, and unresponsive throttle. My local specialist workshop diagnosed it with their computer and found the pedal module's electronics were shot. Had it replaced and recalibrated for around 265 Euro, and it's been running perfectly since. These electronic gremlins can be tricky on modern BMWs. Before jumping to conclusions though, what's your mileage? And have you noticed any other warning messages on the dash? Also, has the car been exposed to water or gone through any deep puddles recently? This info would help narrow things down further. I'd recommend getting it scanned for error codes asap, could save you time and money in diagnosing the exact issue.

Thanks for your detailed response! My XM has 114896 KM on the clock, and I just had it serviced last month. No water exposure or deep puddles recently, and the only warning is the check engine light. The symptoms started suddenly while driving on the highway. I'll definitely get those error codes checked out, hopefully it's just the pedal module like in your case and nothing more serious. Did your car also have sudden power loss when your module failed?

Hey again! Yes, when my X6 M had the pedal module failure, the power loss was really sudden, almost scary actually. I was cruising on the highway just like you when it happened. The car just went into limp mode without warning. I remember feeling pretty nervous since my car was still relatively new, just like yours. The symptoms were identical, power dropped dramatically, idle was all over the place, and the pedal felt like it was connected to nothing. After I had it fixed, my mechanic explained that these pedal modules can fail due to internal electronic components wearing out, even in newer models. The interesting thing is, it's not always age-related, sometimes they just decide to quit. For what it's worth, when my module failed, the error codes pointed directly to the pedal assembly. It was a pretty straightforward fix once they identified the problem. The worst part was really just waiting for the part to arrive. Just make sure whoever checks it uses proper BMW diagnostic equipment. These cars are pretty complex, and generic scanners might not give you the full picture. Let me know what you find out, I'm curious if it's the same issue I had!

Thanks so much for sharing your experience, it's really reassuring to hear your story! What you're describing sounds exactly like what I'm experiencing. Especially that part about the pedal feeling disconnected, that's spot on. It was pretty unnerving when it happened, but knowing your X6 M had the same issue and it was a straightforward fix makes me feel better. I've actually just booked an appointment with a BMW specialist for tomorrow morning. They said they'll do a full diagnostic scan first thing. I'll definitely make sure they use proper BMW equipment like you suggested, don't want to mess around with generic tools on this car. Really appreciate you taking the time to explain everything in detail. I'll update once I know what's wrong, but I've got a strong feeling you're right about the pedal module. Fingers crossed it's as simple a fix as yours was!