Engine control module (ecu/ecm): softwareRecall 21V-734 · Toyota vehicles
Toyota Motor Engineering & Manufacturing recall 21V-734 covers 8,411 Toyota vehicles for a engine control module (ecu/ecm): software problem, reported to NHTSA on September 22, 2021. The manufacturer's latest report (2023 Q3) shows 96% of affected vehicles repaired.
Source: NHTSA recall 21V734000 and manufacturer quarterly reports. Started by the manufacturer.
The problem
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2022 Prius and Prius Prime vehicles. The Engine Control Unit (ECU) software may falsely detect an error and shut down the hybrid system, causing a loss of drive power.
The risk
A loss of drive power increases the risk of a crash.
The fix
Dealers will update the ECU software, free of charge. Owner notification letters were mailed November 18, 2021. Owners may contact Toyota customer service at 1-800-331-4331. Toyota's number for this recall is 21TB07/21TA07.
Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.
How fast cars are being fixed
96%repaired
Share of affected vehicles repaired in each quarterly report the manufacturer filed with NHTSA. 81 vehicles were listed as unreachable.