TSB's

Lexus coolant codes

Some 2008-2009 Lexus vehicles equipped with the 2GR-FE or 4GR-FE engine may exhibit a MIL “ON” condition with one or both of the following codes:

P0128 (Coolant Thermostat belowThermostat Regulating Temperature)

P0116 (Engine Coolant Temperature Range/Performance Problem)

This TSB applies to vehicles produced before the Production Change Effective VINs shown below:

MODEL PLANT DRIVETRAIN PROD. CHANGE EFF. VIN

GS 350 Tahara 2WD JTHBE96S*90045581

GS 350 Tahara 4WD JTHCE96S*90023172

GS450h Tahara 2WD JTHBC96S*95019778

GS450h Tahara 4WD JTHCK262*95033047

IS 250 Tahara 2WD JTHBK262*05099794

IS 250 Tahara 4WD JTHCK262*95033047

IS 250 TMK 4WD JTHCK262*92032298

IS 250 TMK 2WD JTHBK262*92094026

IS 350 Tahara 2WD JTHBE262*95023043

IS 350 TMK 2WD JTHBE262*92017385

REPAIR PROCEDURE

  1. Using Techstream, check for any stored DTCs.
  2. If DTCs P0128 and/or P0116 are present, remove and inspect the thermostat housing and thermostat.
  3. If the thermostat is not securely seated in the thermostat housing, replace the thermostat and the thermostat housing.

The photo on the left shows a thermostat that is nor correctly seated in the housing. The photo at the right shows a properly seated thermostat. If not correctly seated, replace both the thermostat and the housing.
<p>The photo on the left shows a thermostat that is nor correctly seated in the housing. The photo at the right shows a properly seated thermostat. If not correctly seated, replace both the thermostat and the housing.</p>

Tags: Lexus 
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