Engine Coolant Reservoir Overfilled With Discolored Coolant Possible Engine Overheat Transmission Shake Shudder Vibration Shift Performance Or Slipping – 2021-2022 Cadillac Chevrolet GMC

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Bulletin No.: PIP5845A Published date: 10/19/2022 Preliminary Information PIP5845A Engine Coolant Reservoir Overfilled With Discolored Coolant Possible Engine Overheat Transmission Shake Shudder Vibration Shift Performance Or Slipping Models Brand: Cadillac Chevrolet Chevrolet Chevrolet GMC GMC Model: Escalade Models Silverado Suburban Tahoe Sierra Yukon Models Model Years: 2021 – 2022 2021 – 2022 2021 – 2022 2021 – 2022 2021 – 2022 2021 – 2022 VIN: from to 03/01/2021 03/31/2022 03/01/2021 03/31/2022 03/01/2021 03/31/2022 03/01/2021 03/31/2022 03/01/2021 03/31/2022 03/01/2021 03/31/2022 Engine: LM2 L3B LM2 LM2 LM2 L3B LM2 LM2 Transmissions: MQC MQB MQE MQC MQC MQB MQE MQC Involved Region or Country Condition North America Some customers may comment of the following conditions: Engine coolant reservoir is discolored with a strawberry milkshake appearance and may be overfilled to the point where coolant is being expelled from the overflow. See photo below (coolant is not bright orange and translucent). In addition to above, engine, and/or transmission may experience an overheat condition. In addition, possible degraded transmission performance including any of the following: Shudder, vibration, shake, shift performance and slipping. The transmission fluid level may be low when checked. Transmission may have overheat/burnt fluid, with or without any DTC setting, and/or without showing the strawberry milkshake appearance. Any transmission related concern found with vehicle built between the build dates listed above, should have the fluid tested for possible glycol contamination. Cause The Automatic Transmission Fluid Cooling Exchanger may have an internal leak allowing transmission fluid and engine coolant to intermix contributing to and of the above conditions. Correction: Confirm the presence of coolant in the transmission fluid using Service Bulletin # 08-07-30-035 (Information on Water Ethylene Glycol in Transmission) in SI. Using 08-07-30-035 as a guide repair or replace the transmission assembly following SI. Replace the Automatic Transmission Fluid Cooling Exchanger. Thoroughly Flush the Engine Coolant System to remove the contaminated engine coolant following SI. Refill the engine coolant system following SI. Warranty Information For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information. Labor Operation Description Labor Time 8451010 Automatic Transmission Fluid Cooling Exchanger Replacement. Use published labor time. Note: The Automatic Transmission Fluid Cooling Exchanger is the causal part the other components should be added to the warranty claim. Time punches should be used to support the OLH required. Version History Version 2 03/23/2022 – Created on. Modified 10/19/2022 – Updated to add addition comments for conditions. © 2022 General Motors. All Rights Reserved.

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