Allison A40 TCM with DDP Trans Tuning 2006-2008
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The A40 Transmission Control Module found in the 2006-2008 2500/3500 Duramax is prone to failure. The internal circuit board fails and is not serviceable.  When this failure occurs the truck owner may experience Range Shift Inhibited, Service Brake System, Service stabilatrak, loss of gear shift indicator, slamming into Drive or Reverse, and DTC U0101 for loss of communication with TCM.

 This repair at a dealership ranges from $800 to $1200 plus the cost of a tow truck to get your truck there. 

 We offer a brand new Pre-Programmed TCM which comes with our Custom EFILive calibrations. 

Benefits of our TCM include:

  • Improved throttle response.
  • Revised shift strategies for better shift rpm and quality.
  • Improved Torque converter lock-up.
  • Increase MPGs.
  • Extend transmission life.

This plug and play TCM is delivered right to your door and takes roughly 5 minutes to install. 

No core required. 

2 Year Warranty

Will Not Work in 4500 or 5500 trucks.

Shipping information

Cutoff time for same day shipping is 3pm Central Time.  If ordering Next Day Air note that NDA does not deliver on Saturday.  For Saturday delivery or if you have any questions please give us a call.  815-977-5865

  • Item #: Allison A40

Allison A40 TCM with DDP Trans Tuning 2006-2008

Price: $675.00
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