02 Jetta TDI problem - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 03-01-2014, 10:48 PM Thread Starter
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02 Jetta TDI problem

My son has an 02 VW Jetta TDI he replaced the battery in and he inadvertently got the polarity wrong on the battery cables. The car starts and runs but has no radio or headlights. It is also throwing a P0225 and P0228 codes. Does anyone have any idea what damage he may have done and what would possibly be needed to repair it?
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post #2 of 6 (permalink) Old 03-02-2014, 02:53 AM
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My son has an 02 VW Jetta TDI he replaced the battery in and he inadvertently got the polarity wrong on the battery cables. The car starts and runs but has no radio or headlights. It is also throwing a P0225 and P0228 codes. Does anyone have any idea what damage he may have done and what would possibly be needed to repair it?
Usually the first thing to go is the diode bridge in the alternator. The circuits you mention are each protected by individual fuses. Keep in mind each headlamp has it's own protection fuse so there are two. Some of the radios also had two but I don't remember the brand of stereo.

The question I seek an answer for is simply; why, or why not?
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post #3 of 6 (permalink) Old 03-02-2014, 03:26 AM
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Those codes are for"Throttle/Petal Position Sensor/Switch C Circuit Malfunction" and "Throttle/Petal Position Sensor/Switch C Circuit High Input". Your electronic throttle is acting up or bad. My guess is it is bad due to the reverse polarization.

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post #4 of 6 (permalink) Old 03-02-2014, 02:32 PM Thread Starter
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I don't know yet if it got the alternator and thought he may have taken out the diodes. My son has the car a couple of hours away at college. I guess the headlights work but the light in the radio housing is not lighting up. It's minus 5 degrees here today so I doubt he will check the fuse behind the radio until it warms up. The fuse in the fuse panel is ok.

What concerns me with the tps codes is that it may have damaged the ecm. So was just wondering if anyone has had an experience like this before.

I will post an update when I know more.
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post #5 of 6 (permalink) Old 03-02-2014, 04:43 PM
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I don't know yet if it got the alternator and thought he may have taken out the diodes. My son has the car a couple of hours away at college. I guess the headlights work but the light in the radio housing is not lighting up. It's minus 5 degrees here today so I doubt he will check the fuse behind the radio until it warms up. The fuse in the fuse panel is ok.

What concerns me with the tps codes is that it may have damaged the ecm. So was just wondering if anyone has had an experience like this before.

I will post an update when I know more.
Most radios use a bulb behind the faceplate to illuminate either the faceplate display, or the background. Hopefully it's that simple.

I'd have the alternator off car bench tested for output ripple as it may still work with some of the diodes blown; just not as effectively and/or efficiently at recharging the starting battery(s).

The question I seek an answer for is simply; why, or why not?
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post #6 of 6 (permalink) Old 03-07-2014, 01:57 AM Thread Starter
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It looks like this story has a happy ending. The fuse was blown on the back of the radio and after replacing that everything appears to be working ok even the alternator. I will have to check the tps codes next time I get a chance to see if they are active or current. Thanks for the input.
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