trouble code: P0252 what is it

ss44camaro · June 19th, 2008, 23:13

my car not running good. has no power. it just started all the sudden. i scanned it and it comes up with code P0252 (Injection Pump Fuel Metering Control). what does this mean. could it be just a clogged fuel filter? i just bought the car this month and i have been running bio diesel a friend of mine makes from waste veggie oil. he has been running it over a year and i have used 3 tanks so far. could this be a problem?

DanG144 · June 20th, 2008, 05:30

WVO can cause many problems.

It tends to break loose all kinds of crud in a hurry. It will clean the heck out of your fuel system, causing a large crud burst. Most of this should be caught by your filter.

Have you changed your filter? It is very common to plug a fuel filter when switching to WVO. This would be the first thing to do - replace it. A plugged filter can put bubbles in your injector pump. The bubbles will not allow the injector pump to send the right amount of fuel, the car's ECU senses this and increases the stroke, sometimes to a limit, causing an error code.

You can also plug your tank pickup unit. The thread below can help with that.

http://forums.tdiclub.com/showthread.php?t=68872

I am not a big fan of WVO in these cars - it seems too big a risk. But to each his own, ain't America great?

DanG

ss44camaro · June 20th, 2008, 12:23

i replaced the fuel filter... seems to be running good. lost the little wire clip that holds the T fitting on top the filter on. hoping i can get a replacement with new clip at autozone. Is there anything else i should do. preventative maintence wise...?

DanG144 · June 20th, 2008, 14:27

Put in some water removing fuel additive. Power Service and others make good ones. I would periodically add a biocide also - about every 3 to 6 months. Both of these are more important if you use WVO.

Check with other WVO users on oil change frequency - I know one guy who does it every 1000 miles.

DanG

ss44camaro · June 21st, 2008, 09:06

thanks for the help. i got a new problem now im going to start a new tread

Bio-Beetle · July 28th, 2009, 16:28

I thought I would post my experience with this issue. Today I got a P0252 code in our 2003 Jetta TDI, and the car was running sluggishly. Never seen that code before. Found this thread and changed the fuel filter and all is well. DanG, thanks for the info.

Shaun

mbraden · January 1st, 2010, 14:09

I have the P0252 code and recently had my Injector Pump replaced. I just got back from a 2,500 mile trip after the Injector Pump was replaced . . . Any thoughts. The car runs great and I actually got 49+ mpg on this trip. Better than before the IP replacement.

DanG144 · January 1st, 2010, 19:35

I would replace my fuel filter, clear the code, and see if it returns.

Check for air bubbles in your fuel line, too.