# Service bulletin LI83.70\-P\-078292

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: 11033926
- Published by NHTSA: 2026\-06\-17
- Manufacturer's number: LI83.70\-P\-078292
- Manufacturer's date: 2026\-06\-16
- NHTSA component: VISIBILITY/WIPER

## NHTSA's summary

Complaint Red warning message in instrument cluster: "Towing not allowed, see Operator's Manual, consult workshop without starting the engine again". Cause Missing diaphragm on high voltage PTC \(interior heating\) N33/14 component part results in moisture buildup in the installation space for the heater and causes an insulation fault. The entry of moisture into the high voltage PTC \(interior heating\) N33/14 in the high voltage wiring harness to the DC/DC converter N83/1 causes a slow\-acting insulation fault. This may occur sporadically only to start with before actively developing over time. Remedy Exchange high voltage PTC \(interior heating\) N33/14 with new part with diaphragm \(production date as from 22T231, see component part label\). If necessary, and after further testing/measurement, replace wiring harness for DC/DC converter N83/1 to high voltage PTC \(interior heating\) N33/14. Note: According to the Replacement Parts Department only high voltage PTCs \(interior heating\) with a diaphragm and with production date as from 22T231 are available\! This Li only applies to vehicles with PN A 000 835 83 03 installed. If the vehicle has another part number installed, this does not apply.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11033926-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11033926-9999.pdf)

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

## Components

Glass, wipers and mirrors, Wipers and washers

## Vehicles listed

- 2023 to 2025 MERCEDES\-BENZ AMG EQE
- 2023 to 2026 MERCEDES\-BENZ AMG EQE 4MATIC\+
- 2024 to 2025 MERCEDES\-BENZ AMG EQE SUV 4MATIC
- 2026 MERCEDES\-BENZ AMG EQE SUV 4MATIC\+
- 2022 to 2024 MERCEDES\-BENZ AMG EQS
- 2026 MERCEDES\-BENZ EQE 320 4MATIC
- 2026 MERCEDES\-BENZ EQE 320\+
- 2023 to 2025 MERCEDES\-BENZ EQE 350 4MATIC
- 2023 to 2026 MERCEDES\-BENZ EQE 350\+
- 2023 to 2025 MERCEDES\-BENZ EQE 500
- 2023 to 2025 MERCEDES\-BENZ EQE 500 4MATIC
- 2026 MERCEDES\-BENZ EQE SUV 320 4MATIC
- 2026 MERCEDES\-BENZ EQE SUV 320\+
- 2023 to 2025 MERCEDES\-BENZ EQE SUV 350 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQE SUV 350\+
- 2023 to 2025 MERCEDES\-BENZ EQE SUV 500 4MATIC
- 2022 MERCEDES\-BENZ EQS 450
- 2023 to 2026 MERCEDES\-BENZ EQS 450 4MATIC
- 2022 to 2026 MERCEDES\-BENZ EQS 450\+
- 2022 to 2026 MERCEDES\-BENZ EQS 580 4MATIC
- 2026 MERCEDES\-BENZ EQS SUV 400 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQS SUV 450 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQS SUV 450\+
- 2026 MERCEDES\-BENZ EQS SUV 550 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQS SUV 580 4MATIC
- 2024 to 2026 MERCEDES\-MAYBACH EQS SUV 680 4MATIC

JSON: [/v1/bulletins/11033926](/v1/bulletins/11033926)

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