Restore Full Electrical Control to Your GM Vehicle
If your 2008-2012 Savana 1500 Van is acting possessed—with flickering lights, malfunctioning power windows or locks, or a security light that won’t turn off—you’re likely dealing with a failing Body Control Module (BCM). As the central command center for your vehicle’s electronics, a faulty BCM can cause a cascade of frustrating and unpredictable problems. This isn’t just an annoyance; it can affect your van’s security and daily operation. Stop chasing electrical gremlins and get a definitive solution.
This replacement Body Control Module, part number 20815898, is the reliable fix you need. We take the guesswork and hassle out of the repair by pre-programming the module to your van’s specific Vehicle Identification Number (VIN). This means it arrives at your door with the latest GM software updates already installed, ready for a straightforward installation. You get to skip the expensive trip to the dealership for programming, saving you both time and money.
Case Study: A Tricky Diagnosis
A customer brought in a 2011 Express van (which uses the same BCM) with a complaint that was driving him crazy. The radio would turn on and off randomly, the dome light would stay on, and occasionally the horn would chirp when he used the turn signal. He’d already replaced the battery and checked all the fuses. In my shop, we see this pattern frequently. After ruling out wiring issues, we pinpointed the BCM. These modules, especially on work vans that see a lot of door cycles and vibration, can develop internal solder joint fractures. We installed one of our pre-programmed modules, and in under an hour, every single one of his phantom electrical issues was gone. It’s a classic failure mode for this part.
Is Your Vehicle Showing These Symptoms?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that flicker, stay on, or don’t work at all.
- ✔ The security or anti-theft system light is illuminated, possibly causing a no-start condition.
- ✔ The horn sounds at random or doesn’t work when needed.
- ✔ Wipers operate intermittently or get stuck in one position.
- ✔ Diagnostic Trouble Codes (DTCs) related to communication errors, such as U0140, U0155, or other U-codes.
A Straightforward Guide to Installation
Installing your new 2008-2012 Savana 1500 BCM is a manageable job for a DIYer with basic tools. Since it comes pre-programmed, the most complex part of the job is already done.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- Locate the BCM: On most Savana and Express vans, the Body Control Module is located in the center dash area, often behind the glove box or lower dash panels. You may need to remove a few trim pieces to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the old module from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed BCM in the same location and securely reconnect all the electrical connectors. You should hear a click as they lock into place.
- Reconnect Power: Re-attach the negative battery terminal. Turn the ignition to the ‘On’ position (without starting the engine) and test all body functions like lights, locks, and windows.
- Perform Relearns (If Needed): As noted below, some vehicles may require a Brake Pedal Position Relearn or an Airbag System Sync if warning lights are present after installation.
Important Post-Installation Notes
While this module is designed for a simple installation, some vehicle systems may need to be re-synchronized after the BCM is replaced. Please be aware of the following potential procedures:
- Airbag System Sync: If the airbag warning light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure must be performed with a professional scan tool. This is only required if the light appears.
- Brake Pedal Position Relearn: To ensure correct brake light and traction control operation, a brake pedal position sensor relearn may be necessary on certain models.
- No Core Charge: You are not required to return your old module. There is no core charge associated with this purchase.
Disclaimer: Vehicle systems vary. Always refer to a factory service manual or consult a qualified technician if you are unsure about any step.
Will This Fit My Vehicle?
This BCM is a direct replacement for part number 20815898 and is interchangeable with a wide range of other GM part numbers. It is guaranteed to fit the following vehicles:
AVALANCHE 1500 10 (ID 25892622)
CAPRICE 11-13
CAPTIVA SPORT 12
CTS 08-13
DTS 06-11
ENCLAVE 08-12
EQUINOX 07-09
ESCALADE 10
ESCALADE ESV 10
ESCALADE EXT 10
EXPRESS 1500 VAN 08-12
EXPRESS 2500 VAN 08-12
EXPRESS 3500 VAN 08-12
G8 08-09
HUMMER H2 08-09
IMPALA 06-13
LUCERNE 06-11
MONTE CARLO 06-07
OUTLOOK 07-10
SAVANA 1500 VAN 08-12
SAVANA 2500 VAN 08-12
SAVANA 3500 VAN 08-12
SRX 07-09
STS 10
SUBURBAN 1500 10
TAHOE 10
TORRENT 07-09
TRAVERSE 09-12
VUE 08-10
YUKON 10
YUKON XL 1500 10
This module also replaces the following part numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20839063, 20864767, 20864768, 20921435, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084.
Frequently Asked Questions
What information do you need to program the BCM?
After you complete your purchase, we will need the 17-digit Vehicle Identification Number (VIN) from your vehicle. This ensures we load the exact software and configuration for your specific model and options.
Is this a plug-and-play part?
Yes, for the vast majority of functions. Because we pre-program it to your VIN, it eliminates the need for dealer-level programming. However, as noted, certain safety systems like the airbag or brake position sensor may require a simple relearn procedure with a scan tool if a warning light appears.
Do I need to return my old BCM?
No. We do not require you to send back your original module. There is no core charge, which simplifies the process for you.
Will this fix my ‘Service Theft System’ message?
In many cases, yes. The BCM is a critical part of the GM Pass-Key/Passlock anti-theft system. A failing module is a very common cause of this warning message and related starting issues.
How can I be sure this is the right part for my vehicle?
You can match the part number from your original BCM to the extensive list provided. Even if your number is slightly different, as long as it’s on our list, this module will function correctly once programmed to your VIN.