GMC Sierra 2500 2001-2005 Allison Duramax GM Transmission Control (TCM) Module
- Estimated Repair Time is 3-5 business days.
- No programming required
- Real-Time Repair Tracking
- Our service is 100% guaranteed or your money back. Order today and save!
- No additional programming will be required after the repair. Your TCM will be plug-n-play when re-installed back into your vehicle.
- International Shipping Available
To help us process your repair accurately and avoid surprises:
- ✔️ Please select only the issues you are actually experiencing and describe the symptoms in your own words in the “Describe your issues” box.
- ✔️ If your TCM tests good and no fault is found, a $99.99 Bench Test / Diagnostic Fee may apply instead of the repair price.
- 💡️ Scan your vehicle for codes. If no codes are present, let us know. Any stored or pending codes help our technicians confirm the fault and avoid delays.
- 💡️ If the gear selector indicator is incorrect, the vehicle will not start, is stuck in limp mode (3rd gear), or will not go into reverse, we strongly recommend checking the NSBU (Neutral Start Back-Up) switch first.
- 💡️ The NSBU switch is mounted on the transmission and is a very common failure point on 2001–2005 Allison units. Inspect the switch and connector for proper alignment, damage, or corrosion before assuming the TCM is at fault.
- ℹ️ As part of this service, we flash and program the TCM to the latest manufacturer settings based on your VIN. Any custom TCM tunes should be backed up beforehand, as we are not responsible for lost custom settings.
Description
This is a repair and return service for GMC Sierra 2500 2001-2005 Allison Duramax GM Transmission Control (TCM) Module, years 2001 2002 2003 2004 2005 . When you receive your rebuilt part back from us it will be plug-n-play and not need any additional programming.
Once we receive your part, our trained and IPC certified technicians will run tests to identify the source of the problem. We will rebuild your part, replacing not only the failed components, but all components that are usually known to fail or go bad in this part. There is no programming required after we rebuild your original part. We want to make your experience as effortless as possible. All you have to do is send your part to us. Then after receiving the part back from us, just reinstall it and you’re back in business!
Estimated Repair Time is 3-5 business days.
Ordering from outside the U.S.? No problem — we ship internationally.This repair service will fix these issues:
- P2669 - Computer circuit issue
- Transmission not shifting issue
- DTC Codes U0101, U0100 (Lost communication with TCM)
- P0827 - Up and Down Shift Switch Circuit Low
- P0700 - Faulty Transmission Computer Module
Our services are an affordable and effective alternative to expensive dealership part replacements that can save you hundreds of dollars, while continuing to provide an eco-friendly solution that reduces pollution. We drive our business towards consistent and profitable growth, with integrity and a commitment to the people and communities where we live and work. We do more than just repair the part, we go to the root of the problem and upgrade the components to ensure the issue does not return. We will quickly fix your malfunctioning part and return it back to you. Our service is 100% guaranteed or your money back.
ℹ️ Please describe the issues you are experiencing in your own words when placing your order so our technicians can diagnose your Allison TCM accurately.
ℹ️ If your TCM tests good and no fault is found, a $99.99 Bench Test / Diagnostic Fee may apply instead of the full repair price.
💡️ Scan your vehicle for codes. If no codes are present, let us know. Including any stored or pending codes helps our technicians avoid delays and confirm that the TCM is at fault.
💡️ If your gear shift indicator is incorrect, the vehicle will not start, is stuck in limp mode (3rd gear only), or will not go into reverse, we highly recommend inspecting the NSBU (Neutral Start Back-Up) switch first.
💡️ The NSBU switch is mounted on the transmission and is a known weak point on 2001–2005 Allison transmissions. Check the switch and its connector for proper adjustment, damage, or corrosion. If that passes inspection, scan for codes and we can then perform diagnostics on the TCM itself.
ℹ️ As part of this service, we flash and program the TCM to the latest OEM calibration based on your VIN. Any custom TCM tunes or special profiles should be backed up in advance, as we are not responsible for lost custom settings.
A full diagnostic check should first be performed to eliminate all other possible causes for your symptoms, even if the symptoms match those specified on the common fault description.
If you send a unit in good working condition due to misdiagnosis, and our testing determines that there are no issues or faults with the unit, or if the part is beyond repair, then you will only be responsible for the shipping costs and a bench test fee of $69.99 may be applied.
IMPORTANT! If you are not sure that this part is the cause of the fault then we recommend that you do not go ahead with this purchase and instead seek further professional advice and diagnosis.See Why Our Customers Love UpFix!
- Save hundreds of dollars
- Fast & easy process
- High quality components
- 100% guaranteed or your money back
- Amazing customer service and support
- No programming needed
- Plug-n-play
- Refurbished and tested to meet manufacturers specifications
- IPC certified technicians (highest standard of quality craftsmanship)
- Hassle-free warranty that is much better than the warranties you get for new replacements.
How It Works
Our services are an alternative to expensive dealership part replacement and save you hundreds!
We do more then just just repair the part. We go to the root of the problem and use new upgraded parts to ensure the issue does not return. Our service is 100% guaranteed or money back.
- Locate your product on our website.
- Match your symptoms with our descriptions to diagnose the issue.
- Place a repair order and receive a shipping label.
- Send your item to us.
- We'll repair and promptly ship it back to you!
Warranty
Warranty covers the repair of the part for one full year.
If the repair fails within a year, we will repair the part again. In the rare occasion that the item is not repairable, we will either replace the circuit board entirely or refund the cost of the repair, at our discretion.
This warranty is non-transferable and applies to the original purchaser only.
