Description
Part Description
This chassis brain box is an OEM transmission control module removed from a 2005 Volvo V70. The unit controls automatic transmission shifting, torque converter lockup, and transmission diagnostics. It has been inspected by our technicians and is currently on our shelf ready for immediate shipment.
The chassis brain box (TCM) is a critical component that manages your vehicle’s transmission operation. Common reasons for replacement include transmission shifting problems, error codes, complete transmission failure to engage, or erratic shifting behavior. When this module fails, the transmission may go into limp mode or fail to shift properly, making replacement essential for proper vehicle operation.
603 Auto Salvage maintains over 50,000 used auto parts in stock from more than 1,100 vehicles. Our experienced team can help you find the right transmission control module for your Volvo. Call us to verify compatibility and check availability of other Volvo parts you may need. 50,000+ parts in stock from over 1,100 vehicles. Contact us or call (603) 392-7313 for anything you need.
Part Specifications
| Part | Chassis Brain Box (Transmission Control Module) |
| Interchange # | 66120 |
| OEM Part Number | Contact for OEM# |
| Side | N/A |
| Part Grade | X — Grade X – Inspected transmission control module, ready to ship |
| Warranty | 90-Day Warranty (Standard warranty for electronic control modules) |
| Type | Used OEM |
Vehicle Information (Donor)
| Year / Make / Model | 2005 VOLVO VOLV70 |
| VIN | N/A |
| Vehicle Stock # | TCM70 |
Our Testing & Inspection Process
Every part at 603 Auto Salvage is inspected before listing. Here is what was verified on this Chassis Brain Box (Transmission Control Module):
| ✅ Connector Pins | All pins straight and corrosion-free |
| ✅ Housing Integrity | No cracks or damage to module casing |
| ✅ Circuit Board | Visually inspected for burn marks or damage |
| ✅ Mounting Tabs | Secure and undamaged for proper installation |
Compatibility — What Vehicles Does This Part Fit?
Based on interchange #66120, this part fits the following vehicles. Always confirm fitment with your mechanic before purchasing.
| Year(s) | Make | Model | Notes |
|---|---|---|---|
| 2005-2007 | Volvo | V70 | All engine options |
| 2005-2007 | Volvo | S60 | Automatic transmission models |
| 2005-2007 | Volvo | XC70 | Cross Country models |
| 2005-2006 | Volvo | S80 | Verify transmission type |
Questions? Need a shipping quote? Call us now:
603 Auto Salvage | 233 Main St, Plaistow, NH 03865
Mon–Fri 8am–4:30pm | Sat 8am–2pm | Sun Closed
Warranty & Shipping
Frequently Asked Questions
Will this chassis brain box work in my 2005 Volvo V70?
This TCM is specifically from a 2005 V70 and should be compatible. However, programming may be required to match your vehicle’s VIN and transmission specifications.
Do I need to program this transmission control module?
Yes, most TCMs require programming or adaptation to your specific vehicle. Contact a Volvo dealer or qualified technician with scan tool capabilities for proper installation.
What are signs of a failing chassis brain box?
Common symptoms include harsh shifting, transmission stuck in one gear, check engine light, transmission error codes, or complete loss of transmission function.
Is this the same as a transmission computer?
Yes, the chassis brain box is Volvo’s term for the transmission control module (TCM) that manages automatic transmission operation and shifting patterns.
Can I install this TCM myself?
While physical installation is straightforward, programming requires specialized diagnostic equipment. Professional installation is recommended to ensure proper setup and functionality.
Related Parts & Resources
OEM Part Numbers & Cross-Reference
Looking for this part by number? Here are the reference numbers:
| Stock Number | TCM70 |
| Interchange | 66120 |
| Part Number | 591 |
Price Comparison — Why Used OEM Makes Sense
| Source | Price Range | Warranty | Notes |
|---|---|---|---|
| Dealer (New OEM) | $350-$500 | 1 year | Brand new, longest wait time |
| Aftermarket | $200-$350 | Varies | Non-OEM fitment, quality varies |
| Other Salvage Yards | $80-$150 | 30–60 days | Varies in quality and testing |
| 603 Auto Salvage | $65 | 90-Day Warranty | Tested, Grade X, ships in 24hrs |
Installation Notes
- Disconnect battery before removing old TCM to prevent electrical damage
- Take photos of connector positions before disconnection for reference
- Handle module carefully – avoid static electricity and moisture exposure
- Programming must be completed before road testing the vehicle
🔍 Free Fitment Check
Call us with your VIN and we will verify compatibility for free. No obligation, no pressure — just answers.
Our parts specialists check interchange data in real-time
Estimated Shipping Costs by Region
This part ships via FedEx Ground. Prices are estimates — call for an exact quote to your zip code.
| Region | Estimated Cost | Transit Time |
|---|---|---|
| New England (NH, MA, ME, VT, CT, RI) | $15 – $30 | 1–3 business days |
| Northeast (NY, NJ, PA, MD, VA) | $20 – $40 | 2–4 business days |
| Southeast (FL, GA, NC, SC, TN) | $25 – $45 | 3–5 business days |
| Midwest (OH, MI, IL, IN, WI, MN) | $30 – $50 | 3–5 business days |
| Southwest (TX, AZ, NM, OK) | $35 – $55 | 4–6 business days |
| West Coast (CA, OR, WA) | $40 – $65 | 5–7 business days |
Local pickup is always free. Free delivery within 30 miles of Plaistow, NH.
Why Buy From 603 Auto Salvage?
- 50,000+ parts in stock from over 1,100 vehicles on-site in Plaistow, NH
- Every part inspected before listing — no guesswork
- Family-owned salvage yard — real people, not a call center
- 90-Day Warranty on this part
- Fast shipping — most orders ship within 24 hours
- Competitive pricing — save 50–70% vs dealer prices
- Serving New Hampshire, Massachusetts & all 50 states
Ready to order? Call (603) 392-7313 or add to cart above. We are here to help.




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