2007 BMW 328i No Start

Donald Technician North Carolina Posted   Latest   Edited  
Resolved
Drivetrain
2007 BMW 328i 3.0L (N51B30A) 6-spd (GA6-L45R)
Vehicle Will Not Start

Car does not see park when looking at transmission data, no codes in the transmission, cannot remove the key from the slot. looking at data the transmission thinks it is 5th gear. CAN seems normal. no wiring damage noticed. Customer stated the car sat for a period before being towed in, the shop installed a CAS and programmed to the car before my arrival due to not powering up or recognizing any keys. The car will now power up but no starter engagement, no anti theft codes. Does the mechatronic unit in these have a history of these type of problems?

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Brandon Diagnostician
Arizona
Brandon
 

Is the CAS trying to send the start signal to the starter? Can you manually put the transmission in park? Does the data parameter follow?

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Donald Technician
North Carolina
Donald
 

You can shift the transmission from park to drive, data does not change, the gear indicator does by the shifter.

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Louie Technician
New York
Louie
 

Check the body to engine ground strap for corrosion or breakage extremely common with a BMW this age.

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Agree
Jose Technician
California
Jose
 

Gear position switch appears to be under shift selector in console on this model. Maybe customer spilled soft drink. Check wiring under gear shifter.

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Helpful
Donald Technician
North Carolina
Donald
 

Have checked the gear indicator at the shifter, it does change when moving the gear selector.

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Dan Owner
Ohio
Dan
 

Well then…. have you checked if the trans is actually in Park?? Car can't be moved? Shift cable hooked up, not removed by tow operator ;-) I've seen the actuator rod/piston from the selector detend inside the trans break off on numerous occasions but I don't remember if I ever got a no start out of it? However the EGS/ Mechatronic also has a trans position switch! I assume the piston is sheared…

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Agree
Daniel Technician
Virginia
Daniel
 

I agree, the gear position plunger breaks. It seems you've checked everything else.

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Agree
Dan Owner
Ohio
Dan
 

Does the gear indicator on the console change at all? If not I'd go with Jose in the direction of the Selector lever/circuit to go after. Good Luck.

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Bill Owner/Technician
Michigan
Bill
 

Verify the main engine ground strap. (Lower side of engine near mount to body)

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Elias Owner/Technician
California
Elias
   

This may not help but the earlier years had a similar problem not power up part of the mechatronics hence not sending correct gear and no start release from a blown fuse. Try powering up car and sending direct signal to the starter. You may then get faults to help you diag FURTHER​.​BUT for sure check every fuse. I THINK THE OIL LEVEL SENSOR CIRCUIT WOULD SHORT OUT.

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Donald Technician
North Carolina
Donald Update
 

Sorry haven't closed the post, the car is a literal project parked to the side while repairing other cars, hope to get it in the bay in a few days and will post results and hopefully some kind of fix.

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Update Ð Awarded
Keith Technician
Colorado
Keith
   

This is a GM transmission and some are prone to the manual valve breaking. Usually the units with a serial number under 593323. Here is the part number for the valve … Happy hunting.

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Agree
Donald Technician
North Carolina
Donald Resolution
 

Keith was on the spot with the broken shift rod. removed the pan and the plastic piece fell out. Installed a new shift rod(requires removing the valve body) and car now starts, runs and moves under its own power, thanks to all.

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Resolution Ð Awarded