VW T5 CFCA Rail pressure too high during acceleration

Hello everyone,
This forum has helped me immensely many times, thank you all.
But now I need help, I don't know where to start, so much has been changed.

I completely overhauled the engine about 20,000 km ago, and everything is in perfect condition.

About 4 weeks ago, while accelerating from a junction into 3rd gear, I experienced a brief jerk, followed by a stall, engine shut off, and then restarting. The error was gone. Home reading revealed:

Saturday, February 7, 2026, 12:34:40:00800
VCDS Version: DRV 25.3.2 runs on Windows 11 x64
www.Ross-Tech.de

Address 01: Engine Electronics Label File: DRV\03L-906-022-CFC.CLB
ECU Part Number: 03L 906 022 JF HW: 03L 907 309 H
Part and/or Version: R4 2.0L EDC H35 9108
Encoding: 0119401A232400080000
Operating number: WSC 02756 790 50316
ASAM Dataset: EV_ECM20BTD01103L906022JF 002011 (VN75)
ROD: EV_ECM20BTD01103L906022JB_002.rod
VCID: 72EC59E2A5AC010BD5-8026
2 error codes found:

5213 - Fuel System (Bank 1) Rail/System Pressure Too High
P0088 00 [10100111] - -
Warning light ON - Unconfirmed - Checked since last discharge
Environmental conditions:
Error Priority: 2
Error Frequency: 1
Odometer: 204924 km
Date: 2127.14.31
Time: 12:31:44

Motor Speed: 2516.50 /min
Normalized Load Value: 99.6 %
Vehicle speed: 54 km/h
Coolant Temperature: 53 °C
Intake Air Temperature: 21 °C
Ambient air pressure: 950 mbar
Voltage Terminal 30: 14.220 V
Fault counter via OBD: 80
Fuel temperature: 18.2 °C
Average Injection Volume: 41.96 mg/stroke
Rail Pressure Control: Status Bits 0-7: 5
Fuel High Pressure: Measured Value: 1800400 hPa
Fuel High Pressure: Target Value: 1379300 hPa
Adaptation factor of the pressure control valve: 1.0620
Fuel supply: 25.0 l

The error now occurs consistently when accelerating from the 2nd gear. Engine speed fluctuating between approximately 2500 and 3000 RPM, with noticeable jerking. Subsequently, the engine fails to respond to acceleration. "KI" error, then the engine goes into "fail-safe" mode, and the clutch needs to be depressed to allow the engine to continue running normally, which makes driving impossible!

Verified so far: (Rep. Guide VW)
- Low-pressure fuel OK (G6 pressure 0.6 Bar / 0.40 Bar - Delivery volume 1200 ml, power consumption, as well as pre-feed pump 5.0 Bar, 650ml in 30 seconds)
- New cartridge filter
-Fuel return line to tank is clear
-Return line with pressure relief valve replaced by injectors
-Original print sensor replaced
-Replacement of the Bosch pressure regulation valve on the rail
-High-pressure pump does not remove debris, submerged (I still have a good one) - user error
Getting the injectors from Bosch service overhauled also doesn't work!

I might be missing something.
Thank you in advance.

Hello,

High rail pressure is already better than low pressure (usually due to worn-out pump, leaks, or faulty injectors).

Quote:

-Print sensor, original replacement -Replacement of the Bosch pressure regulation valve on the rail

Would my approach, "How to reduce rail adhesion, with or without electrification?" be correct?

If that happens, I could imagine that the engine might stall and the line to the sensor/valve might rub somewhere or have a cable break.

Edit: It appears that the control valve is unpowered and closed, meaning that a cable break that only occurs when the engine is tilted (accelerating) would increase the rail pressure.

Best regards, Rainer

...also auch die Rücklaufleitungen auf Verschlüsse/Verstopfungen überprüfen. Wenn nötig, sind sie gebogen? Is there perhaps still a (defective) check valve/backflow preventer or something similar in the lines?

Hello, how are you?
brezelmann01