K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (2001)
PROM - Programmable Read Only Memory: Customer Interest
Engine Controls - SES Lamp ON/False DTC's P0116/P0181
Bulletin No.: 06-06-04-027
Date: April 27, 2006
TECHNICAL
Subject:
LBZ, LB7, LLY, Service Engine Soon (SES) Light Illuminated, DTC P0116 or P0181 Set with Engine Coolant Heater Usage In Ambient Temperatures
Above -18°C (0°F) (Replace Engine Coolant Heater Cord)
Models:
2001-2006 Chevrolet Silverado
2006 Chevrolet Express Vans
2001-2006 GMC Sierra
2006 GMC Savana Vans
with 6.6L Duramax(TM) Diesel V8 Engine (VINs D, 1, 2 - RPOs LBZ, LB7, LLY)
Condition
Some customers may comment on a Duramax(TM) Diesel vehicle with a Service Engine Soon (SES) light illuminated on the instrument cluster. Some
vehicles may have been previously serviced for this same condition. Technicians may also find the following DTCs set with no concern found.
^
DTC P0116: Engine Coolant Temperature (ECT) Sensor Performance
^
DTC P0181: Fuel Temperature Sensor Performance
Cause
The Fuel Temperature Sensor, Engine Coolant Temperature (ECT), and Intake Air Temperature (IAT) sensors are compared to each other during a cold
start to identify a concern with any one of the sensors. Engine coolant heater usage in ambient temperatures above -18°C (0°F) may trigger a false DTC
P0116 or P0181.
Correction
The diesel supplement to the Owner's Manual advises that the engine coolant heater may be used below -1 8°C (0°F) to assist with cold starts. However,
a customer may wish to plug in the heater when the overnight temperatures are unknown. A thermostatically controlled engine coolant heater cord is
available for the prevention of false DTCs. This cord incorporates a thermostatic switch that only conducts below -18°C (0°F).
Follow the steps below for the particular model year vehicle you are working on to ensure that the correct diagnostics are performed before replacing the
engine coolant heater cord.
2001-2002 Vehicles
1.
Verify that the updated calibration per Corporate Bulletin Number 02-06-04-058 has been installed.
2.
Follow the published diagnostics in SI.
3.
If no concern is found, determine if the customer is using the engine coolant heater above -18°C (0°F).
4.
If the customer is using the engine coolant heater in ambient temperatures above -18°C (0°F), then replace the original coolant heater cord with the
thermostatically controlled engine coolant heater cord, GM P/N 10369173.
2003-2006 Vehicles
1.
Verify that the latest calibration has been installed.
2.
Follow the published diagnostics in SI.
3.
If no concern is found, determine if the customer is using the engine coolant heater above -18°C (0°F).
4.
If the customer is using the engine coolant heater in ambient temperatures above -18°C (0°F), then replace the original coolant heater cord with the
thermostatically controlled engine coolant heater cord, P/N 10369173.
