Description
Allison Transmission part# 29517003
WTEC 2 ECU (ECU Only – Shift pad sold separately). Condition: Reman
Your WTEC 2 ECU will show up ready to install and drive! We just need your CIN (calibration identification number) off your current unit. Ideally if you could send pics to parts@reactionforcellc.com we can get the unit ready for you.
6 month warranty (refund or exchange)
Important notice about this item: We offer free diagnosis and bench testing of your unit. All you pay is shipping. Send us your unit and we will put it on our custom bench and test unit for functionality and codes. You will receive a comprehensive report telling you of our findings. This will give you the assurance that you made the right choice! All testing will be performed within same day of receiving item. If unit is found to be in good working order we will advise fixes for any codes that are present including troubleshoot steps and wiring drawings. FREE!
Send us a message and we will go to work for you.
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Images are for representation purposes only. For reman purchases a photo of the actual item you are receiving will be sent for approval prior to shipping.
WTEC II and III diagnostic code list
6900 Series codes (WTEC II – Shift selector or TCM related)
These typically indicate internal control module or communication issues:
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6927 – Shift selector communications fault – Usually indicates a dead or unresponsive shift pad; most common cause is a failed TCM.
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6928 – Shift selector pushbutton fault – One or more buttons on the shift pad are not functioning properly.
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6929 – Shift selector display fault – Display is not responding or showing incorrect information.
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6934 – TCM initialization fault – The TCM is not initializing properly at power-up, could be due to internal failure or corrupted data.
6600 Series codes (internal ECU failure / TCM logic faults)
These usually point to a failing or failed TCM:
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6613 – EEPROM fault – Memory section in TCM that stores data is corrupt or unreadable.
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6614 – Checksum error – Indicates data integrity problem in the TCM software.
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6616 – Processor fault – Internal TCM processor not functioning correctly.
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6617 – Watchdog timer fault – Internal software monitoring detected a crash or freeze.
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6618 – RAM fault – Temporary memory within the TCM is defective.
3500 Series Codes (power interruption / power supply issues)
These codes suggest problems with power reaching or staying stable at the TCM:
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3511 – Battery voltage too high – May indicate alternator overcharging or faulty voltage regulation.
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3512 – Battery voltage too low – Could result from poor battery condition, faulty alternator, or weak electrical connections.
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3513 – Power interruption during operation – Sudden loss of power to TCM; often caused by wiring faults or loose connectors.
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3514 – Power loss during programming – TCM lost power while being programmed; may result in corrupted memory.
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3515 – TCM power-up failure – TCM did not receive stable voltage during startup; wiring or internal fault.
People also ask (FAQs)
What vehicles are compatible with the Allison 29517003 TCM?
Transit buses, refuse trucks, fire and emergency vehicles, and other medium/heavy-duty trucks using WTEC II systems.
Do I need to program the TCM before installation?
Yes, calibration to your vehicle’s specs is required.
What are common symptoms of a failing TCM?
Erratic shifting, stuck in gear, warning lights, delayed engagement.
Can I install the TCM myself, or do I need a professional?
DIY is possible but professional install/programming is recommended.
What preliminary checks should I perform before replacing the TCM?
Inspect wiring, check for moisture, confirm voltage, and inspect grounds.
What is the warranty on the remanufactured 29517003 TCM?
6-month warranty, refund or exchange from Reaction Force. Review the Reaction Force LLC warranty policy.
How do I return my old TCM core?
Short Answer: Use the provided shipping instructions for a core refund.
Core deposit policy – parts
Priced without core deposit. Core deposit is fully refundable once complete, “like for like” unit is returned to Reaction Force LLC. Buyer pays return shipping and is responsible for any loss of item during shipping. If the unit returned is incomplete or not “like for like” a pro-rated refund will be applied.
Please see our warranty, shipping, refund, and return policies.
Model years 1991 – 1999 approximately. (May overlap in some model year equipment.)
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