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Electrical Discuss anything related to OEM & aftermarket electrical devices including: stereos, speakers, video, batteries, starters, the body control module, lighting, etc.

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Old 04-18-2019, 10:17 PM   #1 (permalink)
brandonb250
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Keyless Entry not working...BCM?

Hello all,
I am new to the fourm! I bought a new to me 2008 Gmc 2500 Duramax about a week ago. Truck was very well taken care of. I noticed driving to work the other day my low tire light came on said pressure was low then went out and came back later on with a constant flashing tire indicator and error message saying "service tire monitor system" along with that my keyless entry no longer works remote start etc. I know its not the battery in the remote its been replaced. Any ideas. Could it be a bad BCM?

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Old 04-18-2019, 10:24 PM   #2 (permalink)
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Welcome to DieselPlace
I moved your post over to "Electrical" for better views and responses



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Old 04-18-2019, 10:56 PM   #3 (permalink)
Ron Nielson
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It could be lots of things. First start by having your truck scanned with a scanner that will read the BCM. The national autoparts chain stores (Autozone, etc) usually have such scanners. There may/may not be codes, but if there is, that's at least a better place to start than guessing. Write down all the codes and report back. Make sure your battery is fully charged and the battery connections are clean on both ends. Amazing how many problems occur because of bad battery.
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Old 04-19-2019, 02:06 AM   #4 (permalink)
heymccall
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Sounds more like an RCDLR issue.
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Old 04-19-2019, 05:48 AM   #5 (permalink)
brandonb250
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I will have the truck scanned and report back with what I find. Thank you!
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Old 04-19-2019, 07:42 AM   #6 (permalink)
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It sounds like a TPM sensor. With your truck being a 2008 the batteries in your sensors are now 10+ years old. Find a tire shop that can read each individual sensor and tell you which one is dead and replace that sensor. Chances are you're going to have to change all of them eventually.
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Old 04-19-2019, 09:30 AM   #7 (permalink)
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Quote:
Originally Posted by cwq21 View Post
It sounds like a TPM sensor. With your truck being a 2008 the batteries in your sensors are now 10+ years old. Find a tire shop that can read each individual sensor and tell you which one is dead and replace that sensor. Chances are you're going to have to change all of them eventually.
Doesn't explain the key fob not working
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Old 04-19-2019, 11:37 AM   #8 (permalink)
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Quote:
Originally Posted by heymccall View Post
Doesn't explain the key fob not working
Correct, I could be wrong. I normally start with the most common things before replacing the BCM.

I've had to reprogram my key FOB on my '03 a couple of times because it lost communication. The BCMs that I've seen go out typically cause other systems to fail too.
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Old 04-19-2019, 01:38 PM   #9 (permalink)
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Quote:
Originally Posted by heymccall View Post
Sounds more like an RCDLR issue.
I'll have to admit that the RCDLR stumped me. Had no idea what that meant.

Remote Control Door Lock Receiver Programming and Setup

Important:

  • When replacing the remote control door lock receiver (RCDLR), the tire pressure monitoring (TPM) information can be learned to the new RCDLR in one of two ways. These two methods are reflected in the selections below. Only choose one of the methods; it is not required to do both methods when replacing the RCDLR.
  • If you choose to perform the Copy and Paste TPM Information procedure, Step 1 must be performed BEFORE removing the old RCDLR. This procedure requires that specific TPM information be extracted from the old RCDLR prior to its removal.
Remote Control Door Lock Receiver Replacement - Copy and Paste TPM Information

This procedure will learn the TPM information to the new RCDLR using the Copy and Paste function on the scan tool. This procedure will extract the TPM Tire Type information as well as the sensor data from the existing RCDLR prior to its replacement and store this information in the scan tool. After RCDLR replacement and SPS programming, the tire type and sensor data stored in the scan tool is written to the new RCDLR, negating the need to perform the tire type setup and sensor learn procedure.

This procedure should be considered as the first programming choice when replacing an RCDLR. The Copy and Paste procedure eliminates the possibility of incorrectly inputting the tire type or learning stray TPM sensors.

Important: This step must be performed prior to the removal or replacement of the old RCDLR.


  1. Using a scan tool, navigate to the Copy and Paste TPM Information procedure and copy the existing TPM information from the RCDLR using the outline below. Follow the on-screen instructions after selecting Step 1:
    • Vehicle Control Systems
    • Module Setup
    • Remote Control Door Lock Receiver
    • Copy and Paste TPM Information
    • Step 1
  1. At this point, install the new RCDLR.
  2. Program the RCDLR - Refer to Service Programming System (SPS). See: Testing and Inspection\Programming and Relearning
  3. Using a scan tool, navigate to the Copy and Paste TPM Information procedure to paste the stored TPM information using the outline below. Follow the on-screen instructions after selecting Step 2:
    • Vehicle Control Systems
    • Module Setup
    • Remote Control Door Lock Receiver
    • Copy and Paste TPM Information
    • Step 2
  1. Program the keyless entry transmitters - Refer to Transmitter Programming. See: Testing and Inspection\Programming and Relearning
Remote Control Door Lock Receiver Replacement - TPM Sensor Learn

This procedure will learn TPM information to the new RCDLR by manually inputting the tire type using the scan tool and performing the TPM sensor learn. This procedure should be performed if the above Copy and Paste procedure can not be completed. An example of this would be an RCDLR that is unable to communicate with the scan tool and is required to be replaced.


  1. RCDLR Programming-Refer to Service Programming System (SPS). See: Testing and Inspection\Programming and Relearning
  2. Keyless Entry Transmitter Programming-Refer to Transmitter Programming. See: Testing and Inspection\Programming and Relearning
  3. Tire Type Setup:
  1. Install a scan tool.
  2. Select Remote Control Door Lock Receiver under Module Setup in the Vehicle Control System menu.
  3. Select Tire Type/Pressure Selection.
  4. Follow the on-screen instructions.
  1. Tire Pressure Monitoring Sensor Learn-Refer to Tire Pressure Sensor Learn.
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Old 04-19-2019, 06:18 PM   #10 (permalink)
brandonb250
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Hello all,
Just left advanced auto I have three codes. U0100, U0102, U0140. Is there maybe something obvious im overlooking before I purchase the new module?
Thanks in advance!

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