Cooling System - DTC P0128 Is Stored In Memory

NUMBER: *11-111-12R*
DATE: 01/23/12
*REVISED: 12/06/12*

APPLICABILITY:
2011-2012MY Legacy/Outback, H-6
2011-2012MY Tribeca, H-6

SUBJECT:
P0128 Coolant Thermostat (Engine
Coolant Temperature below Thermostat
Regulating Temperature)

INTRODUCTION

If you encounter a vehicle which has P0128 stored in memory, it may be caused by a very slight variation in coolant temperature between the left and right cylinder bank.

The slight variations can be contributed to owner driving patterns. As an example, how long a vehicle is permitted to warm up, heater use during cold or hot engine temperatures, etc. An air pocket within the coolant system can also cause the code to set. A countermeasure heater hose pipe is now available which contains an orifice, designed to regulate coolant flow past the coolant temperature sensor.





PART INFORMATION

COUNTERMEASURE IN PRODUCTION





The new style heater hose pipe was used in production starting with VINs shown.

Note:
The new style heater hose pipe has not been incorporated into Tribeca production yet. This bulletin will be updated once countermeasure information is made available.

REPAIR PROCEDURE/INFORMATION

The heater hose pipe is located under the intake manifold attached by 3 bolts. Refer to the applicable service manual for replacement.

Note:
When refilling the coolant system make sure to follow the steps listed in the service manual to insure all air is purged from the coolant system, if not P0128 can be set again in memory.





WARRANTY/CLAIM INFORMATION





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