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ATS Diesel

ATS TCM Upgrade A40 to T87 2WD 2009-2010 GM 6.6L Duramax ATS Diesel Performance

$2,997.78

SKU: A00P 601-920-4344

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The ATS Diesel 601-920-4344 is a Transmission Control Module (TCM) Upgrade designed for GM 6.6L Duramax Diesel trucks with Allison 6-speed automatic transmissions. This upgrade replaces the problematic A50 TCM with a faster T87a TCM processor, improving performance with enhanced shift quality, faster shifting, increased throttle response, and better fuel economy.

Fitment

Fitment Guaranteed

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on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandATS Diesel
Part NumberA00P 601-920-4344

Videos

ATS Diesel - Allison TCM Upgrade -T14 | A50 to T87 with Co-Pilot - 2006-2016 GM 6.6L Duramax

ATS Diesel - Allison TCM Upgrade -T14 | A50 to T87 with Co-Pilot - 2006-2016 GM 6.6L Duramax
Best Replacement TCM For Your 2009-2015 Duramax

Best Replacement TCM For Your 2009-2015 Duramax
Your truck needs TCM Tuning!

Your truck needs TCM Tuning!
ATS Co-Pilot Transmission Controller for the Allison Transmission

ATS Co-Pilot Transmission Controller for the Allison Transmission
Allison tcm failure range shift inhibited A50 symptoms duramax LML sierra silverado no shift

Allison tcm failure range shift inhibited A50 symptoms duramax LML sierra silverado no shift
CODE U0101 2006-2015 Chevy GMC Duramax w/ 6 Speed Allison Trans: TCM Failure Connector Pinout

CODE U0101 2006-2015 Chevy GMC Duramax w/ 6 Speed Allison Trans: TCM Failure Connector Pinout

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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