PIT5734C
Service Bulletin Details
Public Details for: PIT5734C
This preliminary information communicates an issue with poor heater performance and advises dealerships to inspect the heater core inlet and outlet hoses for being twisted or kinked.
Models from 2022
| 2022 CADILLAC ESCALADE ESV |
| 2022 CHEVROLET SILVERADO 1500 |
| 2022 CHEVROLET SUBURBAN |
| 2022 CHEVROLET TAHOE |
| 2022 GMC SIERRA 1500 |
| 2022 GMC YUKON XL |
Models from 2021
| 2021 CADILLAC ESCALADE ESV |
| 2021 CHEVROLET SILVERADO 1500 |
| 2021 CHEVROLET SUBURBAN |
| 2021 CHEVROLET TAHOE |
| 2021 GMC SIERRA 1500 |
| 2021 GMC YUKON XL |
Models from 2020
| 2020 CHEVROLET SILVERADO 1500 |
| 2020 GMC SIERRA 1500 |
Bulletin No.: PIT5734C Published date: 01/26/2022 Preliminary Information PIT5734C Poor Heater Performance - Diagnostic Tip Product Investigation Review Required Models Brand: Model: Model Years: VIN: from to Engine: Transmissions: Cadillac Escalade Models 2021 - 2022 All All 3.0L LM2 All Chevrolet Silverado 1500 2020 - 2022 All All 3.0L LM2 All Chevrolet Suburban 2021 - 2022 All All 3.0L LM2 All Chevrolet Tahoe 2021 - 2022 All All 3.0L LM2 All GMC Sierra 1500 2020 - 2022 All All 3.0L LM2 All GMC Yukon Models 2021 - 2022 All All 3.0L LM2 All Involved Region or Country North America Additional Options (RPO) Condition 3.0L Diesel Engine RPO LM2 Some customers may comment on poor or no heat. When using GDS2 to compare the heater core inlet temperature sensor 3 to the heater core outlet temperature sensor 4, there will be a signi cant di erence (example inlet temp 147 degs F and outlet temp 82 degs F, typically they are within 10-20 degs F). Note: When comparing the di erence in the heater core temperature sensors, make sure the blower motor is on high with the HVAC temperature set to full hot. Cause This issue could be caused by either the heater core inlet or outlet hoses becoming twisted or kinked, and as a result, this may restrict the coolant ow. Correction: If SI diagnostics do not lead to a correction, inspect the heater core inlet (1) and/or outlet (2) hoses for being twisted or kinked, as shown below. In some cases, it can be di cult to see the twist or kink in the hose due to the conduit which covers the hoses. In the examples below, the parts catalog drawing, showing callouts 1 and 2, correlates to the actual vehicle picture callouts 1 and 2. Version History Version Modi ed 4 02/28/2020 - Created on 10/08/2020 - updates to the model list, Model years and condition sections. 02/22/2021 - Updated the model list to include the Full Size SUV's. 01/26/2022- Update model year © 2022 General Motors. All Rights Reserved.