reduced engine power

hjernazian · 01-11-2011, 02:10 AM

in the last 3 or 4 months, I've had 2 reduced engine power messages in my 335i. before you say HPFP, let me say this: no long cranks, no sluggishness, no bouncing rpms. I had my HPFP replaced at about 56k miles for the first and only time. the weird thing is, once i turn the car off and then back on, everything is fine and no reduced engine power light. one of the times it happened was in Mammoth, CA where the car was parked outside in the snow at about 9 degree weather in the night.

any ideas what it could be? I know the HPFP is still plausible, but when my HPFP failed before the reduced engine power indicator would turn on every time i started the car.

Pharaoh2716 · 01-11-2011, 02:21 AM

Make sure your battery has a good charge in it. I got the reduced power light (half engine light) twice, and when I took it in they said that my battery had like no power left in it, most likely from listening to music while vacuuming out my car. Just a though

Gummi · 01-11-2011, 03:15 PM

I had the same thing happen and the dealership said the codes they pulled were HPFP and they ended up replacing it....

hjernazian · 01-11-2011, 04:23 PM

Quote:

Originally Posted by Pharaoh2716

Make sure your battery has a good charge in it. I got the reduced power light (half engine light) twice, and when I took it in they said that my battery had like no power left in it, most likely from listening to music while vacuuming out my car. Just a though

that could be the culprit, i haven't replaced my battery. i'll give it a shot, thanks.

rush111 · 01-15-2011, 04:13 PM

I have the same issue, twice in the last week and I just got a new battery installed (week ago) for other reason. I have never had the HPFP replaced. I guess I'll find out Monday at the dealer.

John 070 · 01-15-2011, 05:42 PM

Wouldn't a battery problem turn on the yellow battery icon? My 1/2 engine light that came and went was VANOS intake solenoid...

chromisdesigns · 01-15-2011, 07:49 PM

Get the codes pulled, it's the only way to know. I had one of these, never came back, but turned out to be collapsed vacuum lines to the turbo waste-gates. Service rep says it's not uncommon. Both lines were replaced under warranty. Vanos solenoid out of spec can also cause intermittent 1/2 engine lights.

01-11-2011, 02:10 AM	#1
hjernazian Lieutenant 35 Rep 458 Posts Drives: 2009 E92 M3 Join Date: Dec 2009 Location: Glendale, CA iTrader: (0)	reduced engine power in the last 3 or 4 months, I've had 2 reduced engine power messages in my 335i. before you say HPFP, let me say this: no long cranks, no sluggishness, no bouncing rpms. I had my HPFP replaced at about 56k miles for the first and only time. the weird thing is, once i turn the car off and then back on, everything is fine and no reduced engine power light. one of the times it happened was in Mammoth, CA where the car was parked outside in the snow at about 9 degree weather in the night. any ideas what it could be? I know the HPFP is still plausible, but when my HPFP failed before the reduced engine power indicator would turn on every time i started the car. __________________ '07 E92 \| Space Grey \| Sport \| Premium \| JB3 \| aFe DCI Stage 2
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01-11-2011, 02:21 AM	#2
Pharaoh2716 Private First Class 91 Rep 180 Posts Drives: 2015 BMW M4 Join Date: Oct 2010 Location: Bay Area, California iTrader: (0)	Make sure your battery has a good charge in it. I got the reduced power light (half engine light) twice, and when I took it in they said that my battery had like no power left in it, most likely from listening to music while vacuuming out my car. Just a though
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01-11-2011, 03:15 PM	#3
Gummi Private First Class 12 Rep 196 Posts Drives: 2007 E90 335i Join Date: Sep 2009 Location: Brampton, ON CANADA iTrader: (0)	I had the same thing happen and the dealership said the codes they pulled were HPFP and they ended up replacing it.... __________________ 2007 BMW 335i (E90) \|Logic Intake\|Split Second Turbo Tuner\|Blacklines\|AC Schnitzer Pedals\|19" Breyton Race GTS
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01-15-2011, 04:13 PM	#5
rush111 Private First Class 299 Rep 133 Posts Drives: 2022 G82X individual Join Date: Jan 2011 Location: Montreal iTrader: (2) Garage List 2022 G82 M4 Competi ... [9.81] 2016 X1 [0.00]	I have the same issue, twice in the last week and I just got a new battery installed (week ago) for other reason. I have never had the HPFP replaced. I guess I'll find out Monday at the dealer.
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01-15-2011, 05:42 PM	#6
John 070 Lieutenant General 1707 Rep 14,829 Posts Drives: 335i cpe Join Date: Oct 2006 Location: ZSP/ZPP/ZCW iTrader: (0)	Wouldn't a battery problem turn on the yellow battery icon? My 1/2 engine light that came and went was VANOS intake solenoid...
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01-15-2011, 07:49 PM	#7
chromisdesigns Lieutenant Colonel 45 Rep 1,754 Posts Drives: 2008 BMW 335i sedan Join Date: Jan 2010 Location: San Francisco iTrader: (0)	Get the codes pulled, it's the only way to know. I had one of these, never came back, but turned out to be collapsed vacuum lines to the turbo waste-gates. Service rep says it's not uncommon. Both lines were replaced under warranty. Vanos solenoid out of spec can also cause intermittent 1/2 engine lights.
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