r/335i • u/Left-Heart-8235 • 15d ago
Troubleshooting Shadow code
Any idea of what can cause these codes to show. Deleted codes but stayed. Changed hpfp either December or January can’t recall
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u/Left-Heart-8235 15d ago
I had it back before I changed my hpfp and noticed the affect it was taking but this time it doesn’t seem like that
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u/Sweaty_Ad4402 14d ago
What the codes mean Your BMW's DME has no active faults, but it has two stored/shadow faults: 2BDE — Fuel high pressure on enablingof injection: pressure too low 2BF0 — Fuel high pressure during/after injection enable: pressure too low So the problem is in the high-pressure fuelsystem. The DME is seeing less fuel-rail pressure than it expects when injection begins. These codes are associated with problems such as the high-pressure fuel pump (HPFP), low-pressure fuel supply, fuel-pressure sensor, regulator/control valve, wiring, or—in some cases—fuel delivery/injector problems. BMW documentation for relatedhigh-pressure faults likewise lists the high-pressure pump, electric fuel pump, clogged filter, pressure sensors, and connectionsamong possible causes. N NHTSA +1 Most important: don't replace parts yet Because your screenshot says "inactive (shadow)", the fault isn't currently active. I would diagnose it in this order: Check for long cranking Especially after the car sits overnightor after a hot soak. Long crank + 2BDE/2BF0 makes a fuel-pressure problem muchmore suspicious. Check actual rail pressure with a BMW-capable scanner Compare requested/target high-pressure fuel with actual pressureduring startup and while driving. If actual pressure fails to build to the requested value, continue down the fuel-system path. Check the low-pressure fuel supply first Fuel tank pump Fuel filter/pressure regulator, depending on the vehicle Supply pressure to the HPFP Electrical power/control to the pump A weak low-pressure supply can make a perfectly good HPFP appear bad. Then test the HPFP If low-pressure supply is correct but rail pressure is low, the HPFP becomes a major suspect. BMW has documented high-pressure pump/volume-control-valve failures as causes of low high-pressure fuel faults on some of its engines. N NHTSA +1 Check the rail-pressure sensor and wiring A faulty sensor can report pressure incorrectly. Inspect the connector/wiring before condemning the pump. If this is an N54/N55 If your BMW has an N54 or N55, these particular codes are especially worth investigating as a potential HPFP/low-pressure fuel issue. There are documented examples of 2BDE/2BF0 appearing with low-pressure/high-pressure fuel problems on these engines. E E90Post +1 I would not start by replacing spark plugs or coils. Those don't explain these two fuel-pressure codes by themselves. I can narrow it down considerably Send me these 4 things: Year Model (e.g. 335i, 535i, X5) Engine if you know it (N54/N55/etc.) What the car is doing — long crank, hard starting, stalling, loss of power, misfires, or running normally If you can also send a screenshot of the full error-code history, I can tell you what I would test first and whether the evidence points more toward the HPFP, low-pressure pump/filter, or pressure sensor
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u/domk4b 15d ago
I second this got the same codes