Water Leak at Roof Area, Various Electrical Issues, No Start, Stall, Brake Lamp Not Off, Radio Inoperative, Remote Key Inoperative, TPM Light Illuminated, Malfunction Indicator Lamp (MIL) Illuminated with Possible DTCs C0750, C0755, C0760, C0765 – 2020-2021 Buick Encore GX & 2021 Chevrolet Trailblazer

SEOCONTENT-START
Service Bulletin Bulletin No.: 20-NA-121 Date: May, 2021 TECHNICAL Subject: Water Leak at Roof Area, Various Electrical Issues, No Start, Stall, Brake Lamp Not Off, Radio Inoperative, Remote Key Inoperative, TPM Light Illuminated, Malfunction Indicator Lamp (MIL) Illuminated with Possible DTCs C0750 SYM29, C0755 SYM29, C0760 SYM29, C0765 SYM29 Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Buick Encore GX 2020 2021 — — All All Chevrolet Trailblazer (VIN M) 2021 2021 All All Involved Region or Country North America Condition Some customers may comment on one or more of the following conditions: • Water leak in the front and/or rear of the vehicle (water found under A-pillar and B-pillar trim or in the spare tire area). • Various electrical concerns • No Start/Vehicle Stall • Brake lamps will not shut off • Radio inoperative • Remote key inoperative • Tire Pressure Monitor (TPM) light illuminated • Malfunction Indicator Lamp illuminated Note: Possible DTCs found, but not limited to: C0750 SYM29, C0755 SYM29, C0760 SYM29, C0765 SYM29 Cause 5703536 Page 2 May, 2021 Bulletin No.: 20-NA-121 5703537 5703539 Bulletin No.: 20-NA-121 May, 2021 Page 3 5613596 The cause of the condition may be a pin hole in the roof body seam welding/sealing. Correction 5615611 Inspect for a leak and repair as necessary. Page 4 May, 2021 Bulletin No.: 20-NA-121 Service Procedure 5703542 5613597 Inspect and repair water leak as necessary. If you encounter a vehicle with the above conditions, you must also include an inspection of the connectors in the water path. Inspect both the A and B-pillar interior trim and in-line connectors under the instrument panel (IP) for signs of a water leak at front roof and the rear cargo interior trim, headliner, and spare tire area for signs of a water leak at rear roof. Once the water leak is found, repair any damage that may have been done due to the water leak. Once the damage is repaired, apply seam sealer along the roof to body seam to correct the condition. Inspect and Clean Body-IP Inline Connectors and Seat Belt Retractor Pretensioners 5752326 5703541 (#8) — X204 Instrument Panel Harness to Body Harness, 76-way connector right side (#6) — X202 Instrument Panel Harness to Body Harness, 2-way connector left side (#7) — X200 Instrument Panel Harness to Body Harness, 76-way connector left side Bulletin No.: 20-NA-121 May, 2021 Page 5 5752327 (#11) — F112D Seat Belt Retractor Pretensioner – Driver (#4) — F112P Seat Belt Retractor Pretensioner – Passenger (not shown) Clean the water inside of the connector and apply NYOGEL on terminals for waterproofing. 1. With vehicle off, disconnect the battery. 2. To access the connectors, remove the left and right garnish trim. Refer to Front Side Door Sill Garnish Molding Replacement and Center Pillar Lower Trim Panel Replacement in SI. 3. Inspect the connectors for any moisture. If needed, clean using a clean nylon bristle brush and dry connector using compressed air. 4. Preparing NYOGEL 760G (electrical grease) and flatting tool, apply on IP harness inline connector surface. Make sure all terminal pins are covered enough by grease. 5. Reattach the connectors. Make sure the 2nd locking tab is closed. 6. Reinstall the garnish trim. Refer to Front Side Door Sill Garnish Molding Replacement and Center Pillar Lower Trim Panel Replacement in SI. Page 6 May, 2021 Bulletin No.: 20-NA-121 Parts Information Causal Part Description Part Number Qty Contact Information N/A NYOGEL 760G (electrical grease) 760G 1 TAI Lubricants, Inc. PO Box 1579 Hockessin, DE 19707 Tel: 1-302-326-0200 Fax: 1-302-326-0400 sales@TAI- Lubricants.com or visit www.tai-lubricants.com Causal Part Description Part Number Qty N/A Kent® High-Tech Seam Sealer Clear P10200 1 Or N/A Wurth Euroseal Gel Clear 18920104 (892.0104 in Canada) 1 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 1481498* Inspect/Clean Body-IP Inline Connectors, Seat Belt Retractor Pretensioners and Body Joint Resealing 1.2 hrs *This is a unique Labor Operation for bulletin use only. For consequential damage, use the labor operation associated with this bulletin. All parts and labor associated should be claimed on the same transaction, using OLH as necessary to cover the labor for repair/replacement of the subsequently damaged part(s). Refer to Service Bulletin #18-NA-146 for additional information. Version 4 Modified Released June 03, 2020 January 20, 2021 – Added the 2021 Model Year to Encore GX and updated information to inspect the entire roof, not just the rear. March 05, 2021 – Added the Inspect and Clean Body-IP Inline Connectors and Seat Belt Retractor Pretensioners section and updated the Parts and Warranty Information. May 20, 2021 – Updated the Subject and Condition section to include DTCs and other possible conditions.
SEOCONTENT-END