BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Did I fry my ECU?

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      12-17-2017, 11:16 PM   #1
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Drives: 2008 335xi e90
Join Date: Mar 2011
Location: Boston, MA

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Red face Did I fry my ECU?

Today I did a radiator flush and had a small charger on during the bleeding/air lock waterpump procedure to finish up. After, decided to remove the Procede - expecting to sell this car soon. Disconnected the battery at the trunk, spaced and left the charger hooked up, and started de-accessing the connectors to the ECU. Heard some electric humming and saw headlights flicker and finally remembered, then disconnected, the charger. After all buttoned up car ran normal for ~20 sec then died. Now starter turns ++ but no ignition. BavTech says "cannot reach" engine ECU and the "ECU reset" command fails.

If someone knows that the ECU is probably gone, please let me know, but I'd be glad to hear otherwise. And for a wrecked ECU, what's the least expensive fix? I'd rather just trade out the ECU in my driveway than tow to a shop, etc.

Thanks for any comments,

2008 e90 SGM 335xi, w/ PP, CW, CA, Sport. Mods: PROcede v2.5, Helix I/C, ER c.p., Forge DVs, BMS OCC, CP-e catless, Borla Cat-back, Quaife, KW V3 w Swift springs, Dinan fixed camber plates, OEM 216's, PWM Meth, StopTech BBK. "Someday": RB turbos, CF sunroof delete (gasp).
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      12-18-2017, 04:52 PM   #2
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feuer's Avatar

Drives: wife crazy!
Join Date: Apr 2015
Location: Chicago, IL

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Did you check the big red fuse in the ECU compartment?
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bavtech, bmw, ecu, fried, n54

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