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BMW fault code 152108: super-knocking (pre-ignition)
Super-knocking fault. What the code means, its most common causes and what to do.
Codes in this family
Six-digit BMW codes stored by the engine control unit (DME). The same code appears in this form in ISTA and in the MOSTUNED app.
| Code | Meaning |
|---|---|
| 152108 | Super-knocking, cylinder 1: Fuel injection deactivation |
| 152208 | Super-knocking, cylinder 2: Fuel injection deactivation |
| 152308 | Super-knocking, cylinder 3: Fuel injection deactivation |
| 152408 | Super-knocking, cylinder 4: Fuel injection deactivation |
What does 152108 mean?
Super-knocking is the mixture igniting by itself before the spark; it occurs at low rpm under high load and is technically called low-speed pre-ignition (LSPI). Unlike normal knock it cannot be prevented by retarding ignition. When the DME detects it, it temporarily switches off injection on that cylinder and stores this code. The code shows the protection working.
Most common causes
Top to bottom, starting with what is easiest to check.
| Cause | What to check |
|---|---|
| Fuel quality | Low-octane or poor-quality fuel is the most common trigger. |
| Engine oil | Use BMW-approved oil of the correct specification; unsuitable oil increases the tendency to pre-ignite. |
| Combustion-chamber deposits | Deposits built up in short-trip use create hot spots. |
| Driving style | Full throttle in a high gear at low rpm is the condition most favourable to pre-ignition. |
Can you drive with this code?
A one-off entry shows the protection did its job. If it repeats, review your fuel and oil, avoid full throttle at low rpm and have the cause found.
How it relates to tuning
Our calibrations keep knock and super-knock protection in place; we do not touch that safety net. Each power level is prepared for a specific fuel quality, and we state it clearly before you buy. On a car run on the right fuel and the right oil, the calibration works within the engine’s protection limits.
Read the code yourself, free
- 1 Install MOSTUNED on your iPhone.
- 2 Connect to the car with an ENET cable or WiFi-ENET adapter.
- 3 Open “Fault Codes” under Diagnostics; stored codes are listed with their descriptions.
- 4 Note the code, fix the cause, then clear it from the same screen and read again to confirm.
Frequently asked questions
What does BMW fault code 152108 mean?
Super-knocking is the mixture igniting by itself before the spark; it occurs at low rpm under high load and is technically called low-speed pre-ignition (LSPI). Unlike normal knock it cannot be prevented by retarding ignition. When the DME detects it, it temporarily switches off injection on that cylinder and stores this code. The code shows the protection working.
Can I drive with code 152108?
A one-off entry shows the protection did its job. If it repeats, review your fuel and oil, avoid full throttle at low rpm and have the cause found.
Does clearing 152108 fix the problem?
Clearing removes the entry, not the cause. If the cause remains, the code returns when the conditions occur again. The right order is: read the code, fix the cause, clear it and read again to confirm.
How do I read code 152108?
You read it for free with the MOSTUNED app: connect your iPhone to the car with an ENET cable or WiFi-ENET adapter and open Fault Codes under Diagnostics. Bluetooth OBD (ELM327) adapters do not provide this connection.
Does tuning cause this code?
Our calibrations keep knock and super-knock protection in place; we do not touch that safety net. Each power level is prepared for a specific fuel quality, and we state it clearly before you buy. On a car run on the right fuel and the right oil, the calibration works within the engine’s protection limits.
I cannot find the cause. What should I do?
Send us your car model, the code and a Logger recording if you have one on WhatsApp and we will look at it together. Related codes: 152208, 152308, 152408.
Next step
- All BMW fault codes — B48 / G-series code guide
- Download the app — Fault reading and clearing are free
- ENET cable and adapter guide — What you need to connect
- Using the Logger — Narrow down the cause with live data
Contact
Not sure?
Send your model, hardware and goal — we will pick the right package together. We do not sell what does not fit.