--- title: "Tesla DI_a138: Front Motor Disabled - Cause & Cost | EV Fix Guide" description: "DI_a138 appears on dual-motor cars when the front drive unit is unavailable. The car keeps driving on the rear motor with less power. It can be a temporary glitch, but if it keeps returning the front drive unit needs inspection, which is usually covered by Tesla's drive unit warranty. Tesla Service: $0. Independent: $1,500 - $4,000. Why it is not DIY and where to get it fixed." canonical: https://evfixguide.com/guides/di-a138-front-motor-disabled 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) · [Tesla Cybertruck](https://evfixguide.com/models/cybertruck) Maintenance & Wear Professional repair only # Tesla DI_a138: Front Motor Disabled - Cause & 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 DI_a138 appears on dual-motor cars when the front drive unit is unavailable. The car keeps driving on the rear motor with less power. It can be a temporary glitch, but if it keeps returning the front drive unit needs inspection, which is usually covered by Tesla's drive unit warranty. At a Tesla Service Center this typically costs **$0 (Under drive unit warranty) / $3,000 - $7,000 (Front drive unit replacement, out of warranty)**. An independent shop charges about **$1,500 - $4,000 (Repair or remanufactured unit)** — potential savings of **40% - 60% (out of warranty)**. **Do not attempt this at home.** ![DI_a138: Front Motor Disabled - OK to Drive](https://evfixguide.com/assets/images/hero-workshop.jpg) ## Symptoms - 'Front motor disabled - OK to drive / Vehicle power may be limited' alert - Noticeably slower acceleration and reduced top speed - Car behaves like rear-wheel drive (less traction in rain or snow) - Sometimes paired with a grinding or whining noise from the front ## Repair cost: Tesla vs independent shop vs DIY | Option | Typical cost (USD) | | --- | --- | | Tesla Service Center | $0 (Under drive unit warranty) / $3,000 - $7,000 (Front drive unit replacement, out of warranty) | | Independent shop | $1,500 - $4,000 (Repair or remanufactured unit) | | DIY | Not possible at home (High-voltage hazard) | | Potential savings | 40% - 60% (out of warranty) | 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? Inside the drive unit warranty (8 years on most cars), go to Tesla. Out of warranty, independent EV drivetrain specialists can diagnose the front drive unit and repair it or fit a remanufactured unit for less than Tesla. This is not regular garage work: it involves high-voltage components. [Get matched with an independent shop →](https://evfixguide.com/?shop=di-a138-front-motor-disabled#find-shop-section) ## How professionals repair it **Safety warning:** The drive inverter and motor are high-voltage parts. Owners can note when the alert appears and whether it clears on the next drive, but the repair itself needs a qualified EV technician. ### Tools a shop uses - Tesla app (to log the alert and book service) - Notes on when the alert appears (temperature, speed, after charging, etc.) ### Steps 1. Continue to your destination; Tesla says the car is OK to drive. Expect less power and drive gently in rain or snow. 2. Park, let the car sleep, and start a new drive. If the alert has gone, Tesla says it was likely temporary and no action is needed. 3. If it returns on later drives, write down when it happens and any noises, then schedule service. 4. Check your drive unit warranty (8 years on most Tesla models, with a mileage limit by model) before agreeing to any paid repair. 5. Out of warranty, get a second quote from an independent EV drivetrain specialist. **Pro tip:** A one-off DI_a138 that clears after a restart is common and usually harmless. A front motor that keeps dropping out, especially with new noises, should be checked soon so a small inverter fault does not become a full drive unit replacement. ## Frequently asked questions ### How much does it cost to fix a DI_a138 front motor alert on a Tesla? Tesla Service Center: $0 (Under drive unit warranty) / $3,000 - $7,000 (Front drive unit replacement, out of warranty). Independent shop: $1,500 - $4,000 (Repair or remanufactured unit). DIY: Not possible at home (High-voltage hazard). Typical savings versus the service center: 40% - 60% (out of warranty). ### Can I fix a DI_a138 front motor alert myself? No, this is not a safe DIY job. The drive inverter and motor are high-voltage parts. Owners can note when the alert appears and whether it clears on the next drive, but the repair itself needs a qualified EV technician. ### Can an independent shop fix a DI_a138 front motor alert instead of Tesla? Inside the drive unit warranty (8 years on most cars), go to Tesla. Out of warranty, independent EV drivetrain specialists can diagnose the front drive unit and repair it or fit a remanufactured unit for less than Tesla. This is not regular garage work: it involves high-voltage components. ### Which Tesla models are affected by a DI_a138 front motor alert? This issue is reported on the Tesla Model 3, Model Y, Model S, Model X and Cybertruck. ## Related guides - [Tesla Brake Caliper Service & Rotor Rust: Cost & DIY — Independent: $100 - $250](https://evfixguide.com/guides/brake-caliper-service-rotor-rust) - [Tesla Model 3/Y Inner Tire Wear: Alignment Cost Guide — Independent: $100 - $200](https://evfixguide.com/guides/uneven-tire-wear-alignment) - [Tesla TPMS Warning & Sensor Fault: Cost & Fix Guide — Independent: $60 - $150](https://evfixguide.com/guides/tpms-tire-pressure-warning) - [Tesla Brake Fluid Test & Replacement: Cost & DIY — Independent: $80 - $150](https://evfixguide.com/guides/brake-fluid-test-replacement) - [Tesla DIR_a251 / DIF_a251: Gearbox Fluid Service Guide — Independent: $150 - $350](https://evfixguide.com/guides/dir-a251-gearbox-fluid-service) - [Tesla ESP_a118: Low Brake Performance Assist Explained — Independent: $150 - $600](https://evfixguide.com/guides/esp-a118-low-brake-performance-assist) This guide is for information only. High-voltage components (orange cables) can be lethal — leave them to trained technicians. Not affiliated with Tesla, Inc.