---
title: "Tesla Pyrofuse Failure: Symptoms & Replacement Cost | EV Fix Guide"
description: "Vehicle shuts down and refuses to shift into gear following an electrical spike, accident, or fuse deployment. Tesla Service: $500 - $800. Independent: $190 - $320. Why it is not DIY and where to get it fixed."
canonical: https://evfixguide.com/guides/pyrofuse-high-voltage-fuse
lang: en
last_updated: 2026-10-24
---

[Tesla Model 3](https://evfixguide.com/models/model-3) · [Tesla Model Y](https://evfixguide.com/models/model-y) · [Tesla Model S](https://evfixguide.com/models/model-s) · [Tesla Model X](https://evfixguide.com/models/model-x) Battery & Low-Voltage Professional repair only

# Tesla Pyrofuse Failure: Symptoms & Replacement Cost

By the EV Fix Guide editorial team · Updated October 24, 2026 · [How we estimate costs](https://evfixguide.com/about#how-we-estimate-costs)

## Quick answer

Vehicle shuts down and refuses to shift into gear following an electrical spike, accident, or fuse deployment. At a Tesla Service Center this typically costs **$500 - $800**. An independent shop charges about **$190 - $320** — potential savings of **60% - 70%**. **Do not attempt this at home.**

![High-Voltage Pyro-Fuse Blown / Car Won't Start or Shift](https://evfixguide.com/assets/images/battery-bench.jpg)

## Symptoms

- Vehicle displays 'Car Cannot Drive' warning and refuses to shift into Drive or Reverse
- High-voltage contactors fail to close (no audible clunk)
- 'BMS_a027 / BMS_f027: Pyro-fuse deployed' fault code on screen

## Repair cost: Tesla vs independent shop vs DIY

| Option | Typical cost (USD) |
| --- | --- |
| Tesla Service Center | $500 - $800 |
| Independent shop | $190 - $320 |
| DIY | $75 - $130 (Part cost only) |
| Potential savings | 60% - 70% |

Ranges are US estimates compiled from owner reports and shop quotes; prices vary by region, model year and parts availability. Report your price.

## Can an independent shop fix it?

Independent EV shops can replace the pyrofuse without dropping the full battery pack (via the under-seat access hatch on Model 3/Y or front battery access panel on Model S).

[Get matched with an independent shop →](https://evfixguide.com/?shop=pyrofuse-high-voltage-fuse#find-shop-section)

## How professionals repair it

**Safety warning:** Requires knowledge of high-voltage systems and complete HV capacitor discharge verification. Must be completed by qualified EV technicians.

### Tools a shop uses

- 1000V Insulated Socket & Torque Wrenches
- Digital Multimeter (Voltage & Resistance measurement)
- Genuine Tesla Replacement Pyrofuse

### Steps

1. Disconnect the 12V battery negative terminal and pull the First Responder Loop to safe the vehicle.
2. Remove the rear seat cushion on Model 3/Y to access the high-voltage penthouse inspection cover.
3. Verify zero voltage across terminals using a calibrated multimeter.
4. Unbolt and replace the deployed pyrotechnic fuse assembly with a genuine unit.
5. Clear stored BMS crash/fuse error codes via Tesla Service Mode and power cycle the vehicle.

**Pro tip:** On Model S/X, when the internal 9V battery within the older pyrofuse module depletes, the system may register a false deployment fault. Sometimes only the internal battery needs replacement.

## Deep dives

- [BMS_f107 deep dive: isolation fault diagnosis →](https://evfixguide.com/repairs/bms-f107)

## Frequently asked questions

### How much does it cost to fix a blown pyrofuse on a Tesla?

Tesla Service Center: $500 - $800. Independent shop: $190 - $320. DIY: $75 - $130 (Part cost only). Typical savings versus the service center: 60% - 70%.

### Can I fix a blown pyrofuse myself?

No, this is not a safe DIY job. Requires knowledge of high-voltage systems and complete HV capacitor discharge verification. Must be completed by qualified EV technicians.

### Can an independent shop fix a blown pyrofuse instead of Tesla?

Yes. Independent EV shops can replace the pyrofuse without dropping the full battery pack (via the under-seat access hatch on Model 3/Y or front battery access panel on Model S).

### Which Tesla models are affected by a blown pyrofuse?

This issue is reported on the Tesla Model S, Model X, Model 3 and Model Y.

## Related guides

- [Tesla 12V / 16V Battery Replacement: Cost & DIY Guide — Independent: $100 - $150](https://evfixguide.com/guides/12v-16v-low-voltage-battery)
- [Tesla Charge Port Door Stuck or Won’t Open: Fix & Cost — Independent: $120 - $200](https://evfixguide.com/guides/charge-port-door-stuck)
- [Tesla BMS_u029 / BMS_f107 Battery Fault: Repair Cost — Independent: $1,800 - $3,500](https://evfixguide.com/guides/bms-u029-battery-isolation)
- [Tesla Frunk Won’t Open (Dead 12V): Model 3/Y Fix — Independent: $50 - $150](https://evfixguide.com/guides/frunk-dead-12v-battery)
- [Tesla VCFRONT_a180: Electrical System Power Reduced Fix — Independent: $100 - $300](https://evfixguide.com/guides/vcfront-a180-electrical-power-reduced)
- [Tesla VCFRONT_a182: Replace Low Voltage Battery (Cost) — Independent: $100 - $250](https://evfixguide.com/guides/vcfront-a182-replace-low-voltage-battery)

This guide is for information only. High-voltage components (orange cables) can be lethal — leave them to trained technicians. Not affiliated with Tesla, Inc.