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BMW fault code 11A002: fuel high pressure too low
Fuel high pressure 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 |
|---|---|
| 11A002 | High pressure fuel: Pressure too low |
| 11A001 | High pressure fuel: Pressure too high |
| 11A401 | High pressure fuel: Pressure too low during engine start |
| 119302 | Rail pressure sensor: Pressure too low |
| 110001 | Cylinder cutout: Fuel high pressure too low |
What does 11A002 mean?
The B48 is a direct-injection engine: the electric pump in the tank brings fuel to the engine at low pressure, and the camshaft-driven high-pressure pump raises it to injection pressure. If rail pressure stays below what the DME requests, these codes are stored. If pressure does not recover, the engine protects itself by cutting cylinders.
Most common causes
Top to bottom, starting with what is easiest to check.
| Cause | What to check |
|---|---|
| Low-pressure supply | The in-tank pump or its filter may not be feeding the high-pressure pump adequately. The low-pressure value is checked first. |
| High-pressure pump | The pump or its quantity control valve may be worn. |
| Rail pressure sensor | A faulty sensor reports a pressure that is actually correct as low. |
| Low fuel level | At very low fuel level the pump can draw air, especially when cornering and accelerating. |
Can you drive with this code?
The car loses pull or stumbles when accelerating. If a cylinder-cutout code is stored, do not use high load; a starved cylinder runs lean.
How it relates to tuning
More power means more fuel. Our calibrations are prepared within the healthy operating range of the B48’s factory fuel system. A tired low-pressure pump goes unnoticed at factory output and shows up first at full throttle once power is raised. By logging target and actual rail pressure together you see whether supply is keeping up.
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 11A002 mean?
The B48 is a direct-injection engine: the electric pump in the tank brings fuel to the engine at low pressure, and the camshaft-driven high-pressure pump raises it to injection pressure. If rail pressure stays below what the DME requests, these codes are stored. If pressure does not recover, the engine protects itself by cutting cylinders.
Can I drive with code 11A002?
The car loses pull or stumbles when accelerating. If a cylinder-cutout code is stored, do not use high load; a starved cylinder runs lean.
Does clearing 11A002 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 11A002?
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?
More power means more fuel. Our calibrations are prepared within the healthy operating range of the B48’s factory fuel system. A tired low-pressure pump goes unnoticed at factory output and shows up first at full throttle once power is raised. By logging target and actual rail pressure together you see whether supply is keeping up.
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: 11A001, 11A401, 119302, 110001.
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.