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01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 11-07-2013, 05:17 PM   eBay Motors  #1 (permalink)
 
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block heater

plug heater up this week,but it does not seem to be working.I have checked power supply,its good
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Old 11-07-2013, 05:42 PM   eBay Motors  #2 (permalink)
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Why do you think it's not working? How long did you have it plugged in for?
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Old 11-07-2013, 05:48 PM   eBay Motors  #3 (permalink)
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What wa the ambient air temp when you tried using it?
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Old 11-07-2013, 05:48 PM   eBay Motors  #4 (permalink)
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The cords are known to go bad. Ohm it out and see. But the heating element can obviously go bad as well. The heating element went bad in the lb7 i had. Also if the cord has ever been replaced by the dealer then it has a thermal switch in it that wont even allow the block heater to work anything above 18*F.
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Old 11-07-2013, 05:52 PM   eBay Motors  #5 (permalink)
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Here you be...

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 -18C (0F) (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 -18C (0F) 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 8C (0F) 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 -18C (0F).

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 -18C (0F).

4. If the customer is using the engine coolant heater in ambient temperatures above -18C (0F), 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 -18C (0F).

4. If the customer is using the engine coolant heater in ambient temperatures above -18C (0F), then replace the original coolant heater cord with the thermostatically controlled engine coolant heater cord, P/N 10369173.
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