TSBs

Corrosion Causing Toyota Drivability Issues

April 15, 2022

Corrosion and water in the A43 ECM connector of Toyota Highlanders or the A9 inverter water pump connector on Hybrid models is due to poorly sealed or damaged aftermarket windshield deicer harnesses.

Information courtesy of Mitchell 1,

Mike Mavrigian

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Some 2014-2018 Toyota Highlander and Highlander Hybrid vehicles may exhibit one or more of the following conditions:

Various drivability concerns
Low or no fuel pressure
DTCs including but not limited to P1603, P1604, P1605, P0171, P0300, P0302, P0304 and U0100
Some 2014-2018 Highlander Hybrid vehicles may exhibit DTC P134A.

These conditions may be caused by corrosion/water in the A43 ECM connector (Highlander) or the A9 inverter water pump connector on Hybrid models. The corrosion in these connectors is due to poorly sealed or damaged aftermarket windshield deicer harnesses.

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

About the Author

Mike Mavrigian | Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.