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Porsche Rear BCM Failure Guide: Common Issues, Affected Part Numbers, and Affordable Repair Options

Posted on by Bogdan Karman

If you own a Porsche 911, Boxster, or Cayman from 2005 to 2012, there’s a hidden electronic component under your driver’s seat that might already be causing problems—the Rear Body Control Module (Rear BCM). This unit is responsible for managing several critical systems in your car, and it’s known to fail frequently due to water intrusion and aging electronics.

In this blog post, we cover:

  • What the Rear BCM is and what it controls
  • Common symptoms of a failing Porsche BCM
  • Known part numbers that fail
  • Affected Porsche models and years
  • Affordable alternatives to dealer replacement
  • How to order a plug-and-play clone service

🔧 What Is the Porsche Rear BCM?

The Rear Body Control Module (BCM) is a computer unit located underneath the driver’s seat or rear cabin area, depending on model. It controls and communicates with many of the car’s rear systems, including:

  • Rear lights
  • Rear spoiler
  • Central locking
  • Convertible top
  • Power windows
  • Trunk release

This BCM communicates with other modules in your car like the front BCM, DME (engine computer), and instrument cluster. If it fails, several systems may stop functioning.

⚠️ Common Porsche Rear BCM Failure Symptoms

Many Porsche owners have reported the following issues, often caused by a water-damaged or failed rear BCM:

  • Rear lights not working
  • Central locking intermittently fails
  • Convertible top becomes unresponsive
  • Rear spoiler not deploying or retracting
  • Power windows stop working
  • Car won’t start (in some cases)
  • Random electrical issues
  • Dashboard warning lights
  • Persistent battery drain
  • No communication with diagnostic tools

🚧 Why Do Porsche Rear BCMs Fail So Often?

These BCMs are positioned low in the vehicle where they are vulnerable to water intrusion. The most common causes include:

  • Clogged sunroof or cowl drains
  • Water leaks from door seals or convertible tops
  • Flood-damaged vehicles
  • Condensation or poor sealing in the cabin

Once moisture gets in, the module corrodes, shorts, or completely fails.

📄 Part Numbers Known to Fail

These are all part numbers of Porsche Rear BCMs that are known to fail and are supported in our clone service:

  • 997.618.260.01
  • 997.618.260.02
  • 997.618.260.03
  • 997.618.260.04
  • 997.618.260.06
  • 997.618.260.08 (latest and most robust revision, but still fails when exposed to water)

🚗 Porsche Models and Years Affected

These BCMs are commonly found and fail in the following Porsche models:

  • Porsche 911 (997 Series)
    • Years: 2005–2012
    • Trims: Carrera, Carrera S, 4S, Targa, Turbo
  • Porsche Boxster (987 Series)
    • Years: 2005–2012
    • Trims: Base, S, Spyder
  • Porsche Cayman (987 Series)
    • Years: 2006–2012
    • Trims: Base, S, R

These models are now aging, and many have clogged drain channels or leaky seals, making BCM failure increasingly common.

🚑 Dealer Replacement vs Clone Service

If you go to the dealership:

  • Expect to pay $900–$1300+ for a new module, programming, and labor
  • You’ll need to tow the car if it won’t start
  • BCM availability may be limited or discontinued

Our Solution: Plug-and-Play Clone Service

At Karman Auto, we offer a Rear BCM Clone Service for just $300, including:

  • Full transfer of VIN, immobilizer, and coding data
  • No need for programming or dealer tools
  • Just install and drive

🛎️ How to Order:

  1. Add to Cart and Checkout
  2. Print the receipt or write your order number on paper
  3. Ship both your original and donor BCM
    • Mark one as “Original”
    • Mark the donor as “New” or “Donor”
  4. Ship to:

Karman Auto

🚀 Get Back on the Road Fast

Stop wasting time with dealer reprogramming and overpriced replacements. If your Porsche rear BCM is acting up, get it cloned the smart way.

🔗 Order the Porsche Rear BCM Clone Service Now

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Let us know if you have questions. We’re here to help you get your Porsche running right—quickly, affordably, and without any dealer drama.

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Bogdan Karman
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Bogdan Karman