# Service bulletin LI20.00\-P\-073432

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11005346
- Published by NHTSA: 2024\-07\-31
- Manufacturer's number: LI20.00\-P\-073432
- Manufacturer's date: 2024\-07\-27
- NHTSA component: ENGINE

## NHTSA's summary

Complaint Yellow "Coolant" message in instrument cluster • Compare the sound and feel of each pump. An improperly functioning, bled, or faulty pump will make a very distinct churning noise. The pumps should be near silent and should not vibrate or heat up. • If you find a pump that is making more noise than the others it is most likely pulling in air from somewhere or is encountering a restriction \(refer to the first point in this section\) If nothing of note is found, proceed to step 2. Step 2: Disassemble underfloor paneling and wheel well interior trim at front right to gain access to the two low temperature pumps. Take note of or photograph the part number of the pump holder, along with the production date. Step 3: Check the installation position of the pumps at the front right of the low\-temperature circuit \(Fig. 1\) : SPECIFIED PART NUMBER AT EACH LOCATION: Outer: A 000 500 5500 \(Fig. 1, position A\) Inner: A 000 500 3800 \(Fig. 1; position B\) a. If installation position is OK, skip to step 6 b. If installation position is not OK, continue to step 3 Step 4: Photograph the pump part numbers at the front right so that the QR\-code/DMC code and the part number are visible and legible. Please label the pictures with the original installation position, upload them to the case and proceed to step 4. Operation step 5: Order new pump\(s\) \(where the item numbers differ from the specified part number\) SPECIFIED PART NUMBER: Outer: A 000 500 5500 \(Fig. 1, position A\) Inner: A 000 500 3800 \(Fig. 1; position B\) Operation step 6: Use a vacuum bleeder to fill the cooling system of the low\-temperature circuit Operation step 7: Vent the cooling system of the low\-temperature circuit using XENTRY. The following fault code may also be present in the PTCU: P2B2A7A \- The speed of the 'Coolant pump' component part is too high. A leak or defective seal was detected. Notes on fault code: The fault code affects the 15W pump at the rear right of the vehicle. It is located on the side of the transmission \(Fig. 1, position C\). This fault code is set because there is air in the system, so it performs an emergency dry run function. This LI DOES NOT APPLY to model year 2024 and up vehicles. For these vehicles pump PN's A0005009100 and A0005008900 are the correct pumps Cause Various possible causes Remedy PLEASE READ ALL THE STEPS AND NOTES BELOW BEFORE PERFORMING ANY STEPS. Then perform the following steps. Document any findings and discrepancies, where applicable, and create a PTSS case if the following do not remedy the complaint. Step 1: With the engine cold, use Xentry to activate the two pumps at the passenger front. As they are running, remove the cap from the low temp cooling circuit reservoir and observe the coolant. • If it overflows the reservoir, or blows out upon removal of the cap there is a restriction somewhere in the coolant lines. • This can take the form of a physical restriction inside of one of the lines or pumps or a damaged or kinked hardline or rubber hose. • Activate each pump in succession and listen to it using a stethoscope or by placing an ear to a screwdriver or other implement placed on the pump • Compare the sound and feel of each pump. An improperly functioning, bled, or faulty pump will make a very distinct churning noise. The pumps should be near silent and should not vibrate or heat up. • If you find a pump that is making more noise than the others it is most likely pulling in air from somewhere or is encountering a restriction \(refer to the first point in this section\) If nothing of note is found, proceed to step 2. Step 2: Disassemble underfloor paneling and wheel well interior trim at front right to gain access to the two low temperature pumps. Take note of or photograph the part number of the pump holder, along with the production date. Step 3: Check the installation position of the pumps at the front right of the low\-temperature circuit \(Fig. 1\) :

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11005346-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11005346-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Trouble codes named

P2B2A

## Vehicles listed

- 2021 to 2022 MERCEDES\-BENZ AMG GLE63 S
- 2023 MERCEDES\-BENZ AMG GLE63 S 4MATIC\+
- 2020 to 2022 MERCEDES\-BENZ AMG GLS63
- 2023 MERCEDES\-BENZ AMG GLS63 4MATIC\+
- 2023 MERCEDES\-BENZ AMG GLS63E
- 2021 MERCEDES\-MAYBACH GLS 600
- 2022 to 2023 MERCEDES\-MAYBACH GLS 600 4MATIC

JSON: [/v1/bulletins/11005346](/v1/bulletins/11005346)

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