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Old 08-14-2009, 07:54 AM
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Default Problem w/ECM Computer on '01 Jetta?

Hi everyone- Tuckaseegee here. My wife has an '01 Jetta VR6. Great car, but has had some reliability issues over the years. It's started running a bit rough and is kicking out multiple codes on the check engine. The mechanic (who we think is pretty good) has diagnosed it as a bad ECM computer. He says there's no way that as many things are as wrong as the ECM says. I believe they've tried to reset it, and it runs well for a bit, then startes to run badly, and kisks out a bunch of codes again. He's recommending we replace the computer.

He gave me a quote on a new computer of $690 for the part (w/labor on top of that). I suggested we try looking for a used computer, as there are some on ebay for ~$150. He's open to this idea, but says he's heard from some vw folks that we could be risking serious compatibility issues when we try and enter a second VIN # into the used computer. He's looking for a remanufactured ECM, and is still doing some research on the issue.

Since this car has given us some trouble, our goal is to get this problem fixed, spruce up the vehicle and sell it. Thinking of buying a new TDI wagon.

What do you guys think? If your computer was bad, would you replace it with a new one or a used part?

Last edited by tuckaseegee; 08-14-2009 at 01:13 PM. Reason: Update: 8/14/09
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Old 08-14-2009, 08:54 AM
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Used and Chipped would be my purchase...your sounds like used and sold is the best bet.
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Old 08-14-2009, 12:00 PM
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If your keeping the car I would do new because of a warrenty and install it yourself. Since your selling the car get used and install it yourself
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Old 08-14-2009, 01:22 PM
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Default Now not sure it's the computer... Codes listed

I called him today and he said based on a conversation with some other specialists, he's no longer sure it's the computer. I got him to give me the codes. Here they are:

17832- Secondary air injector system bank 1 P1424
16684- Misfire P0300
16686- Cylinder 2 mis-fire P0302
16804- Catalyst system cylinder bank 1 operation too low P0420 intermittent
16795- Secondary air injection faulty flow P0411 intermittent
18011- ECU defective P1603 intermittent

Yeeeesh! What do you guys think is causing all of this? Any ideas? I'm putting out a call for all of your collective wisdom and brainpower to help me figure out the best way to proceed.

Last edited by tuckaseegee; 08-14-2009 at 01:24 PM.
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Old 08-15-2009, 05:56 AM
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due a tune up. plugs,wires and a new coil pack. That would cause misfire and O2 sensor code. Not sure if it would cause ecm code but if you know someone with a vr6 then i would swap ecm's to see if yours runs any better. If so then replace ecm. the 2ndary air pump code is logged only @ startup. The pump runs @ startup to put fresh air into system for cleaner emission. Pump only runs for 15-20 seconds when first started. That also could cause a O2 code but not misfire. Hope this helps
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02 Jetta GLX VR6 12v

1 of those stubby things on the roof
Euro switch
AEM CAI
Unitronic stage 1+
2.5 in borla catback w/o resonator
35% tint
2 12" JL W1v2
JL A1200 Amp
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Old 08-16-2009, 05:13 PM
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The secondary air injection problems shouldn't be causing a problem with the car running as it's just part of a VVT procedure during startup. Try replacing the plugs, plug wires, and the ignition coil. Sometimes a code thrown for a cylinder misfire can trigger a bunch of unrelated and related codes. One step at a time, besides, it's about time for some maintenance anyways. Be sure to only use OEM parts for replacement parts or you will run into bigger problems. Craig@vwdiscountparts.com can get you a deal on OEM parts that are genuine vw.
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