The Toyota RAV4 Hybrid is one of America’s top-selling green crossovers. With sales passing 100,000 units in the past few years, it is more popular than many major brands’ mainstream crossovers. And it has been proven to be extremely reliable. However, there is one odd failure beginning to cause issues for owners.
Internal Toyota service notification T-TT-0630-20 alerts its dealer technicians that some 2019-2020 model year RAV4 HV vehicles may experience DTC codes P0AA649 / P1C8049. These codes indicate “Hybrid/EV Battery Voltage System Isolation Internal Electronic Failure” or, “P1C8049-Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure.” Toyota goes on to say that the root cause of the issue is a short in MGR connector due to corrosion. The alert was issued by Toyota on October 27, 2020.
If an owner experiences this problem, technicians are advised to “Raise the vehicle to visually inspect the high voltage wire harness that connects to the MGR. Unplug and check for corrosion or buildup of dirt and sediment in the connector.” They are then advised to “Confirm the cable corrosion or dirt build-up at the MGR connector and call TAS for further instruction. If it is a weekend or holiday, continue with diagnosis and repair. Please save all parts and/or details and contact TAS on the next available workday.”
Clearly, Toyota has identified a possible problem related to this portion of the RAV4 Hybrid’s powertrain. If your vehicle displays a check engine light and the technician identifies the codes listed above request a warranty repair. Hybrid components are warrantied by Toyota for 8 years/100,000 miles, whichever comes first. The parts listed in the technical alert are all part of the hybrid drive system. As you can tell simply from their names.
In the event that the dealer pushes back on covering the cost of repairs under warranty, try calling Toyota’s corporate customer support line for help. Let them know you are aware of the Internal Toyota service notification T-TT-0630-20 and that you know your hybrid components are warrantied for 8-years or 100K miles. In the event you do have to pay for any repairs or diagnostic fees, retain your receipt because it is likely a future recall or class action suit may end up with a reimbursement program.
If your Toyota RAV4 Hybrid has experienced this problem, please tell us about your experience in the comments below. Your notes may assist other owners.
Image of Toyota RAV4 Hybrid Component courtesy of Tom Smeal.
John Goreham is a long-time New England Motor Press Association member and recovering engineer. John's interest in EVs goes back to 1990 when he designed the thermal control system for an EV battery as part of an academic team. After earning his mechanical engineering degree, John completed a marketing program at Northeastern University and worked with automotive component manufacturers, in the semiconductor industry, and in biotech. In addition to Torque News, John's work has appeared in print in dozens of American news outlets and he provides reviews to many vehicle shopping sites. You can follow John on TikTok @ToknCars, on Twitter, and view his credentials at Linkedin
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