Audi 2.5 TDI BDG: Engine Problems & Solutions

Translated on 28-10-2026, 20:02.

Hello, maybe someone here can help me. I'm having a problem with my Audi.

During the drive, I experienced a sudden loss of power. The engine then stopped responding to the accelerator, and the check engine light came on (limp mode).

I have the following errors in the engine control unit:

01282 035 Switching valve for intake manifold control flap - N239.
sporadically
01259 031 Fuel pump relay J-17 - Open circuit/Short to ground.
sporadically
01375 031 Valves for engine mounting, Level 1 - Short circuit to ground/open circuit.
sporadically
...... Valves for engine mounting, Level 1 - Short circuit to ground.
sporadically
17809 P1401 035 Exhaust gas recirculation valves - Short circuit to ground.
sporadically
01262 031 magnetic valve, boost pressure control - N75: Open circuit/Short circuit to ground.
sporadically

The errors reappear all at once after deleting them.
"Does anyone else experience this problem? How do I fix the error? I suspect it's the engine control unit."

Guest Free account, no CAN development support

Are all the fuses okay? Are all the connections OK?

Translated on 28-10-2026, 20:04.

Yes, all fuses and connections are fine. There are no visible or measurable faults in the wiring.

Translated on 28-10-2026, 20:04.

Has absolutely no one heard of this error before, or have any idea what it might be?
I found a post in the forum from May of this year describing the same error, but unfortunately, the author hasn't responded to tell me how they fixed it.

Translated on 28-10-2026, 20:05.

I'm experiencing the exact same problem. I initially thought it might be due to one of these components, since they all share a common power supply line. I tried isolating the issue by disconnecting each component individually, but all the components seem to be okay. Have you managed to resolve the problem yet?

Translated on 28-10-2026, 20:05.

Please clean the grounding points. It's a common mistake.

Translated on 28-10-2026, 20:06.

I've been having the same problem for over three months.

1. The turbocharger boost pressure control valve (N75) was replaced. After 30 km, the errors reappeared.
2. Control unit checked. => Allegedly OK.
3 fuel pump relay J-17 units were replaced. 1000 km of trouble-free operation.
4. Contacts on the control unit connector were replaced. 650 km, all okay.

Have you found the error?