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How to Tell If Your Porsche BCM Is Failing: Top Symptoms & What to Do Next
Is your Porsche acting up with strange electrical problems? The issue could be your Rear Body Control Module (BCM). This guide will help you identify the most common signs of BCM failure and what steps to take before heading to the dealer.
🚗 What Does the Rear BCM Control?
In Porsche 911 (997), Boxster (987), and Cayman (987) models, the Rear Body Control Module is responsible for managing:
- Rear lighting systems
- Central locking
- Convertible top controls
- Power windows
- Rear spoiler
- Trunk release
It communicates with other systems, so a failure can trigger a chain reaction of issues across your car.
⚠️ Common Symptoms of a Failing Porsche Rear BCM
If your BCM is failing, you may experience one or more of the following problems:
- Random failure of rear lights or turn signals
- Trunk won’t open (even with key fob)
- Rear spoiler stuck or unresponsive
- Convertible top stops working
- Power windows dead or intermittent
- Car won’t start or crank (in rare cases)
- Intermittent locking/unlocking from the key fob
- Strange battery drains
- Electrical functions working one day and failing the next
If any of these issues sound familiar, and especially if they happen together, the rear BCM is a strong suspect.
📃 Why the Rear BCM Fails (and Why It’s So Common)
The rear BCM in 997 and 987 series Porsches is located under or near the driver’s seat—a location prone to water exposure.
The most common causes of failure are:
- Clogged cowl or sunroof drains
- Water leaks from convertible tops
- Flooded vehicle history
- Poor sealant aging over time
Moisture enters the BCM, causing corrosion and electronic failure. The issue is so common that many used Porsches from this era already show signs of BCM problems.
🔹 What to Do If You Suspect BCM Failure
If you suspect your Porsche’s rear BCM is going bad:
- Inspect under the driver’s seat for moisture or water staining
- Check if your fuses are repeatedly blowing for rear lighting systems
- Run a diagnostic scan — if the BCM doesn’t communicate, it’s likely dead
- Check the drain holes for blockage or buildup
You can replace the module at the dealership, but that usually means high cost and complex reprogramming.
💊 A Better Solution: Rear BCM Clone Service
Instead of replacing the module and paying for coding, you can clone your original BCM. At Karman Auto, we offer a simple plug-and-play solution:
- Transfer of all VIN, coding, and immobilizer data
- No dealer programming required
- Works with matching donor modules
- Fast, professional service
Just ship both your original and donor BCM to Karman Auto (mark them “Original” and “Donor”) and we’ll handle the rest.
🚀 Don’t Let a Bad BCM Leave You Stranded
A failing BCM may seem like an isolated problem, but it quickly snowballs into a list of expensive, confusing issues. If you own a Porsche 997, Boxster, or Cayman and are seeing these symptoms, it’s time to act.
🔗 Order Your Porsche Rear BCM Clone Service Now
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