# Service bulletin T\-TT\-0462\-17

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10146520
- Published by NHTSA: 2018\-11\-05
- Manufacturer's number: T\-TT\-0462\-17
- Manufacturer's date: 2017\-11\-14
- NHTSA component: FUEL SYSTEM, OTHER:STORAGE:TANK ASSEMBLY:PRESSURE RELIEF DEVICES

## NHTSA's summary

T\-TT: Vehicles may experience various drivability concerns. Upon diagnosis, technicians commonly find no or low fuel pressure as well as a variety of DTCs \(Commonly P1603, P1604, P1605, P0171, P0300, P0302, P0304, U0100\). Technicians find that the cause this condition is corrosion and water in the A43 ECM connector \(Fig 1\). In several cases, it was found that the source of water was from aftermarket windshields with poorly sealed or damaged deicer harnesses \(Fig 2\). Water enters the deicer harness and is wicked through the engine room main harness, eventually collecting in the ECM connector.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10146520-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10146520-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Fuel system, Fuel tank

## Trouble codes named

P0171, P0300, P0302, P0304, P1603, P1604, P1605, U0100

## Vehicles listed

- 2014 to 2017 TOYOTA HIGHLANDER

## Other bulletins for the same vehicles and component

- [T\-SB\-0050\-15](/bulletins/10111420.md), 2017-08-14, Service bulletin: ENGINE; FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY. TSB: Some 2011 \- 2015 model year Highlander HV vehicles may exhibit a condition of MIL "ON" with DTC\(s\) P2111 and/or P0A0F after a cold soak. Follow the Repair Procedure in this bulletin to address this condition.

JSON: [/v1/bulletins/10146520](/v1/bulletins/10146520)

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