BodyB121A98
SeriousSeverity: Serious - have it checked soon
Electrical expansion valve 'Heat exchanger for cooling the high-voltage battery' has a malfunction. The component or the system has overtemperature.
Key terms: Control module: a small computer that runs one part of the car
1What it means in plain English
A body system has a fault. Depending on the make, this range can include airbags and seat belts, windows, locks and climate control, and also charging, brake, oil or coolant sensors.
2Common causes
- Wiring or connector fault
- Faulty sensor or switch
- Water or corrosion in a connector
- Control module fault
- Low battery voltage
3Can I drive?
Stop safely away from buildings and people - battery overheating can lead to fire. Do not charge or drive. Have the vehicle recovered.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 1
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | B121A98 | Electrical expansion valve 'Heat exchanger for cooling the high-voltage battery' has a malfunction. The component or the system has overtemperature. Brand | Body |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Related codes
Browse Bxxx codes or B121xx codes.