Diagnostics7 min read

When Your Transmission Needs a Reflash

Expedia Protection

Up to 5-year warranty on reman and used parts when fitment is verified.

See warranty details →

Expedia Protection

Up to 5-year warranty on reman and used parts when fitment is verified.

See warranty details →

Expedia Protection

Up to 5-year warranty on reman and used parts when fitment is verified.

See warranty details →

Many reman transmissions require dealer or shop reprogramming after install. Skipping reflash causes no-shift and code issues.

Quick Answer

Most modern automatic transmissions need a **reflash or reprogram** after replacement so the PCM learns shift strategy and solenoid data. Treat reprogramming as part of install cost.

Signs reflash was skipped

No shift or harsh shift from first drive
Wrong gear commanded vs actual
Persistent transmission-related codes after fluid fill

Documentation for warranty

Keep the shop invoice showing reflash completed and date aligned with install.

FAQ

Can any shop reflash?

Use a shop with OEM-capable scan tools for your make.

Related on Expedia Parts

Won’t shift after install: /blog /reman-transmission-wont-shift-after-install
Warranty documents: /blog /documents-required-warranty-claim
Shop transmissions: /used-transmissions