False Triggering of Low Coolant Level Warning Message (Reprogram HVAC Control Module)
| Subject: | False Triggering Of Low Coolant Level Warning Message (Reprogram HVAC Control Module) |
| Models: | 2007-2008 Chevrolet Silverado 2500 and 3500 Heavy Duty Series Only |
| 2007-2008 GMC Sierra 2500 and 3500 Heavy Duty Series Only |
| with 6.6L Diesel Engine (VIN 6 -- RPO LMM) |
Condition
Some customers may comment that a "COOLANT LEVEL LOW ADD COOLANT" message is displayed in the Driver Information Center (DIC) even though the coolant level is normal.
Cause
This condition may be caused by a false reading during off-road driving or in high slush conditions.
Correction
Do This | Don't Do This |
|---|---|
Reprogram the HVAC control module. | Do not replace the coolant level sensor, HVAC control module or radiator surge tank. |
A revised calibration has been developed to address this condition. Technicians are to reprogram the Heating Ventilation and Air Conditioning (HVAC) control module with the latest software available on TIS2WEB. Refer to the Service Programming System procedures in SI. As always make sure your Tech 2® is updated with the latest software version.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
D4707 | HVAC Control Head Module or Assembly Reprogramming with SPS | Use Published Labor Operation Time |
