Lack Of Heat In ECO Mode (PI1390)

Publication date: 2015-01-15
Reference number: PI1390

LACK OF HEAT IN ECO MODE

TECHNICAL SERVICE BULLETIN

Reference Number(s): PI1390, Date of Issue: January 15, 2015

AFFECTED MODEL(S):

2014-2015 Cadillac ELR, Chevrolet Volt

CONDITION/CONCERN

Some customers may comment that when the vehicle is in ECO mode, there is a lack of heat coming from the HVAC system.

This may be caused by a software anomaly.

RECOMMENDATION/INSTRUCTIONS

An updated software calibration has been released to address this concern that will increase the maximum allowable output while running in ECO mode.

IMPORTANT: Verify the battery voltage is more than 12 volts but less than 16 volts before proceeding with reprogramming. The battery must be fully charged BEFORE reprogramming.

IMPORTANT: During reprogramming, the battery voltage must be maintained within the proper range of 12-15.5 volts. CONNECT the approved Midtronics® PSC 550 Battery Maintainer (SPS Programming Support Tool (EL-49642) to the vehicle or the GR8 (EL50313) in the power supply mode.

Reprogram the HVAC Control Module using the Service Programming System (SPS) with the latest calibrations available on TIS2WEB. Refer to the HVAC System Control Module Programming and Setup procedure in SI.

WARRANTY INFORMATION

For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.

Labor Operation	Description	Labor Time
2810015	HVAC System Control Module Reprogramming with SPS	Use Published Labor Operation Time