The 1st generation Tesla DC-DC converter takes high-voltage pack power and converts it down to the 12 V system that runs lights, modules, pumps, relays, and accessories. When this unit fails or drifts out of spec, the 12 V battery can no longer charge correctly, causing low-voltage shutdowns, warning messages, and no-start conditions. This OEM-style replacement for part number 6009170-00-J restores proper 12 V charging on affected early Model S vehicles.
Each 1st generation DC-DC converter 6009170-00-J we offer is an OEM Tesla unit that has been bench-tested under load by our EV technicians. We simulate pack voltage on the HV side and load the 12 V output to confirm stable regulation, proper current capability, and isolation before it leaves our facility. Direct replacement for early Tesla Model S Gen1 DC-DC converter part number 6009170-00-J.
| Part Number | 6009170-00-J (1st generation DC-DC converter, Tesla Model S) |
| Function | Converts high-voltage traction pack DC to regulated 12 V DC to support the LV electrical system and charge the 12 V battery. |
| Vehicle Application | Early Tesla Model S (approx. 2012–2015) equipped with Gen1 DC-DC converter 6009170-00-J. Confirm by part label or VIN. |
| Electrical | High-voltage DC input from traction battery; isolated, regulated 12 V DC output for LV loads and battery charging (OEM Tesla design). |
| Cooling / Housing | Sealed aluminum housing mounted in the front power electronics area, designed to share heat rejection with adjacent HV components. |
| Installation | Bolt-in replacement; requires high-voltage lockout, correct torque on HV and LV connections, and post-install function/isolation check. |
| Condition | Cleaned and bench-tested OEM unit, inspected for connector damage, corrosion, or heat-related defects. |
Gruber Motor Company can supply this Gen1 DC-DC converter as a stand-alone part or install it as part of a complete high-voltage / low-voltage diagnostic and repair package in our Phoenix facility. If you’re unsure whether your Model S is still running the 1st generation converter 6009170-00-J or has been retrofitted, contact us with your VIN and a photo of the existing unit and we can confirm fitment.
Whenever you replace a DC-DC converter, also load-test or replace the 12 V battery and inspect major grounds and high-current LV wiring. Poor connections or a failing 12 V battery can shorten the life of the new converter and cause recurring warnings.
Our Tesla specialists routinely diagnose Model S DC-DC converter and 12 V charging issues. For help confirming part numbers, interpreting fault codes, or planning an installation, call 623.433.8500 or email our service team with your VIN and photos of your existing converter.
