Savana 3500 V8-4.8L (2009)
Coolant Temperature Sensor/Switch (For Computer): All Technical Service Bulletins
Engine - MIL ON P0116/P1400 Set In Very Cold Temps
TECHNICAL
Bulletin No.: 10-06-04-008A
Date: January 24, 2011
Subject: Malfunction Indicator Lamp (MIL) Illuminated at Very Cold Ambient Temperatures When Using Engine Coolant Heater, DTC P0116 and/or
P1400 Set (Relocate Engine Coolant Temperature (ECT) Sensor and Engine Coolant Heater Cord)
Models:
2006-2007 Buick Rainier
2009 Buick LaCrosse Super, Allure Super (Canada Only)
2006-2010 Cadillac Escalade
2006-2007 Chevrolet Monte Carlo
2006-2009 Chevrolet Impala SS, TrailBlazer
2006-2010 Chevrolet Avalanche, Express, Silverado Tahoe
2006-2009 GMC Envoy
2006-2010 GMC Savana, Sierra, Yukon
2006-2008 Pontiac Grand Prix
2006-2009 Saab 9-7X
Equipped with V8 Engine RPO LC9, LH6, LH8, LH9, L76, LS2, LS4, LFA, LZ1, L92, L94, L9H or L20, L96, LMF, LMG, LY2, LY5, LY6
Please Refer to GMVIS
Attention:
To properly correct this condition, you must follow both of the procedures to relocate the ECT sensor and the engine coolant heater cord.
Supercede:
This bulletin is being revised to add cast iron block engine RPOs and to update the Warranty Information coverage period. Please discard Corporate
Bulletin Number 10-06-04-008 (Section 06 - Engine/Propulsion System).
Condition
Some customers may comment that the malfunction indicator lamp (MIL) illuminates after starting the vehicle when they were using the engine coolant
heater in very cold ambient temperatures. This usually occurs in a range of -23 to -40°C (-10 to -40°F) or colder.
The technician may observe on a scan tool DTC P0116 and/or P1400 set as Current or in History.
Cause
This condition may be caused by the engine control module (ECM) determining that the ignition OFF time requirement has been met at start-up and
interpreting the temperature difference between the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor as being
outside of a calibrated range.
Correction
Important
DO NOT replace the ECM for this condition.
Relocating the ECT Sensor
1. Turn ON the ignition with the engine OFF.
2. Perform the diagnostic system check - vehicle. Refer to Diagnostic System Check - Vehicle in SI.
‹› If DTC P0116 and/or P1400 are set and the customer WAS using the engine coolant heater, proceed to Step 3.
‹› If DTC P0116 and/or P1400 are set and the customer WAS NOT using the engine coolant heater, refer to Diagnostic Trouble Code (DTC)
List - Vehicle in SI.
3. Turn OFF the ignition.
Warning
To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam
