P0E30 is the code for a third fuse in the high-voltage system, after A (P0A95) and B (P0E2F). No manufacturer documents P0E30 publicly. How such a fuse is checked can be seen from the siblings: Volvo and Polestar have the battery control module compare the voltage measured after each fuse output with the pack voltage, and Porsche numbers its Taycan fuses as fuse and fuse 2 under P0A95 and P0E2F. A pack with only two fused branches never sets P0E30. What the third fuse protects, for example a heater, compressor or charger branch, is decided by the maker. If it opens, the consumers on that branch lose power; a blown fuse normally follows a short circuit that has to be found before the fuse or the battery unit is replaced.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Symptoms
- HV system warning message
- Consumers on the affected branch without function
Most likely causes
- Short circuit in a consumer on the third fused branch
- Faulty voltage measurement behind the fuse
- Software error in the battery control module
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- It can trigger limp mode.
What each character of P0E30 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- E: Subsystem depends on the code range
- 30: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0E30?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P0E30?
The most common causes are: short circuit in a consumer on the third fused branch; faulty voltage measurement behind the fuse; software error in the battery control module.
Related codes
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.