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

NHTSA ID Number: 10226385

Manufacturer Communication Number: PIP5845A


This Preliminary information communicates to the dealer technician that if the vehicle’s engine coolant reservoir has transmission fluid in it or if Glycol it found in the transmission fluid the dealer should replace the Automatic Transmission Fluid Cooling Exchanger. The dealer should refer to bulletin 08-07-30-035 for the recommended components that should be replaced in the transmission and to flush the engine cooling system following service information.



Some customers may comment of the following conditions:

Engine coolant reservoir is discolored with a strawberry milkshake appearance and may be overilled to the point where coolant is being expelled from the overflow.

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.



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.


20 Affected Products


GMC SIERRA 1500 2021-2022
GMC SIERRA 2500 2021-2022
GMC SIERRA 3500 2021-2022
GMC YUKON XL 2021-2022


1 Associated Document

Manufacturer Communications

Bulletin No.: PIP5845A
Published date: 10/19/2022


MC-10226385-9999.pdf 277.132KB




Bestseller No. 1
Lubegard 19025 Kooler Kleen Transmission Cooler Flush High Pressure Formula, 18 oz.
  • High pressure water based formula physically removes gunk from transmission cooler lines by flushing out grease, dirt, sludge, and metal shavings
  • Prevents costly comebacks by eliminating build-up of new or rebuilt units and inhibits the return of foreign deposits including rust which reduces claims
  • Contains no CFC's or chlorinated solvents and leaves no soapy residue
  • OEM and large rebuilder approved; ideal for those that do not have a dedicated flushing machine
  • Standard 5/16" fitting
Bestseller No. 2
Lubegard 19001 Kooler Kleen Transmission Cooler Flush, 13.25 oz.
  • Will not leave behind water or soapy residue to contaminate the transmission
  • Removes grease, dirt, sludge, grime and metal shavings
  • Will not harm seals or degrade new automatic transmission fluid
  • Kooler Kleen is re-packaged for auto makers
  • Special Shipping Information: This item cannot be returned and has additional shipping restrictions
Bestseller No. 3
Liqui Moly Pro-Line Automatic Transmission Cleaner 20224 1 Liter (1)
  • Cleans Automatic Transmissions
  • For Optimum Gear Shift Performance
  • Cleans and Frees ATF Circuit of Deposits and Residues
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Lubegard 95001 Transmission Flush, 10 oz.
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Mophorn Flush Machine DC12V 0-60PSI Automatic Transmission Fluid Exchanger Heavy Duty Transmission Flush Machine for Small Gasoline Motor Car and Diesel Vehicle
  • Auto Transmission Flush Machine: Driving Force: (Electric) DC12V; Pressure Gauge: 0-60PSI
  • Oil cycling flow speed monitor; effectively protect the gear-box and remove the grease and metal fillings.
  • Scope: Middle, small gasoline motor car & diesel vehicle; change the oil by the power of gear-box and the exchanger.
  • The transmission oil exchanger has the vehicle in and out of the service bay in less than 15 minutes; easy convenient and no damage to other engine components.
  • The automatic refrigerant refill feature maintains a user-selectable amount of refrigerant in an internal vessel and signals when it's time to change supply tank, no monitoring required.
Bestseller No. 6
Niteo Motor Medic M1410TF Synthetic Automatic Transmission Flush - 10 oz.
  • Package Dimensions: 3.81 H x 20.066 L x 8.382 W (centimetres)
  • Prepares auto-trans for new fluid
  • Country of Origin : United States
  • Package Weight: 0.55 pounds
Bestseller No. 7
Lubegard 98602 Flush and Protect Performance Pack for Automatic Transmissions
  • Safely removes varnish deposits
  • Prepares transmission for new fluid
  • Protects against heat, wear and oxidation
  • The protectant used by transmission professionals worldwide
  • The only product used and endorsed by automakers
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Smilyeez BG Transmission Service Flush Kit PN 106 Cleaner PN 310 Conditioner with Pocket Screw Driver (1)
  • Prolongs fluid life
  • Maintains transmission performance
  • Extends transmission life
  • Prevents thermal breakdown of fluid
  • Greatly improves oxidation stability
Bestseller No. 9
Lubegard 98010 Platinum Universal Flush and Protect Performance Pack for Automatic Transmissions
  • Fit Type: Vehicle Specific
  • Package Dimensions: 1.875 L x 7.1875 H x 5.75 W (inches)
  • Package Weight : 1.4 pounds
  • Country of Origin : United States
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CTA Tools 7650 Transmission Oil Drain and Flush Kit
  • Fully Drains Transmission Oil Cleanly by Air Pressure
  • Most Draining Methods Use Gravity, Leaving Up to 26L of Oil Left in the System
  • Services Mercedes 7226 and 7229 Transmission
  • BMW 6HP And 8HP Transmission
  • Fit Type: Universal Fit

Last update on 2023-03-02 / Affiliate links / Images from Amazon Product Advertising API

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