Golf IV / Jetta IV :: Getting 20 Intermittent Ground Fault Codes
Oct 16, 2014
I am getting 20 intermittent ground fault codes and the kid I bought the car from had an alternator put in. I see a terminal closest to the front of the car on the alternator that has no thick wire attached to it and when I was at the junkyard they had wires connected to them. I cleaned all other grounds on the car that I can access so I think that could be the issue but I don't know where the wire should lead to and how the alternator should be grounded!
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Keep getting o2 fault codes. Replaced sensors came back. tried another set of sensors came back. Checked wiring for breaks no luck. Replaced ecu still no luck. So going through wiring again and checking for continuity. Looking for a list of what pins to check for voltages, and what each should be from ecu to sensor connectors. Looking for what wire is signal and how to and what voltages to check for...
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The vehicle is a 2004 Jetta MK4 1.8t.
Last thing I had replaced about 2 months ago was the Solenoid valve, the MAF and Solenoid hose. Car ran fine for about a month, and bam...engine light came back on, along with the ASR light. At first it was saying "cat converter" so I researched that, and what a surprise, it spoke about being a $1k piece to replace. NOTHING HAS BEEN CHEAP ON THIS CAR, and I'm losing my mind.
The latest adventure happened today coming back from the gym. Car started jerking (which has been normal since every now and then the ASR light will come on, which I'm told is the traction control light. Causing the car to jerk. Simple fix is pulling over, shutting the car off, and turning it back on. That always clears it, and then I'm back on the road.) but instantly it lost power. It wont shift, but the traction control light didn't come on. I plugged my OBD2 tool up, and came back with these fault codes:
P0420: Catalyst System Efficiency Below Threshold (Bank 1)
P0753: Shift Solenoid "A" Electrical
P2637: Torque Management Feedback Signal A
I'm going to go to these guys tomorrow, but I would just like to get an educated guess on what might be going on, so I don't look like a lost dog while they're figuring out what to do next. These guys seem knowledgeable, but they're missing something since I've been in and out of their shop several times and still getting my traction control light on at random times, and now all 3 of these codes.
Does that Solenoid code have anything to do with the Solenoid valve they put in? I was told that cleaning the throttle body and the cat converter might work. Would those be cheaper options to consider, and see if that works?
I also read that unplugging the alternator and plugging it back in, then cleaning the male and female with electrical cleaner might work. I was told about a month ago that my battery barely passed. Could this be causing any of my issues? I also did a log while I was driving, but all that's showing up is a google map document.
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I have a 2008 MK4 2.0 with only 53,000kms. At 40,000Kms I put new OEM spark plugs.
Just recently, every morning when I start the engine is sputtering and rough running. The engines want to die but I give a little gas, and run rough like it is only firing on two or three cylinders.
When it gets to the normal operating coolant temperature it runs without any problem and I can use the AC. Its only give me this problem on the first start of the day.
Does not have any MIL light on the instrument panel. I scan it with VCDS-Lite and do not found any fault codes. The only thing that's come to my mind is to change the Green Coolant Sensor.
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I recently picked up a 2000 jetta vr6 for a very good price its a glx I have owned a vr6 before and done timing chains myself on it this one is a glx , I am having 5 fault engine codes on my vagcom they are cam position sensor , knock sensor, secondary injection pump, and mass air flow it ran fine 100 miles yesterday this morning the epc came on then went off and ran bad can these codes all be related or do I have to replace each sensor individually..
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So i installed a USP test pipe and got Revo Stage 2 upgrade yesterday. I had no codes before the test pipe. I still have a CEL for 9 fault codes. 4 of which are all the o2 sensor codes. With all these codes my Traction Control light is on too. I think this may be a safety thing. I thought Stage 2 was supposed to get rid of the CEL. Especially for the 02 sensors in the rear.
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I coded a few things through VCDS (fogs as DRLs, turned up XDS, enabled TSC, etc.) and now I'm getting fault codes from ABS...
I did an autoscan before I started and there were no fault codes before.
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Well my car is crapping out lately,
I put a new steering rack in my mk4 1.8t jetta about a week before I parked it for winter. I went out to the garage yesterday and noticed a pool of PS fluid on the ground, I located one very small leak from the bottom banjo bolt on the rack (needs new crush washers, Was in a rush and didn't have time to pick new ones up :bang head: ).
But the part that confuses me is there is a puddle on/under the passenger side subframe, the rack boot appears to be dry, and I don't believe the new rack is faulty, they are supposed to be all tested and approved before reaching the buyer. and when I turn the car on I can't see a leak anywhere even with the wheel off and a decent view of the rack.
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All seems to be going well, drove the car for first 200 meters yesterday! Replacing the faulty parts is always easiest, just need to know if there are any shortcuts for fixing this. What's the engine oil temperature sensor? The one bolted in oil pan?
The intake air temperature is showing -40 degrees celsius.
MAF is plugged correctly.
VAG-COM gives me these following codes:
3 Faults Found:
000406 - Engine Oil Temp. Sensor (G8)
P0196 - 004 - Implausible Signal - Intermittent
000275 - Intake Air Temp. Sensor (G42)
P0113 - 002 - Signal too High - Intermittent
000258 - Mass Air Flow Sensor (G70)
P0102 - 002 - Signal too Low
Readiness: 0000 0000
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Car was taking 3-4 seconds to turn over when I started it one night. After that, flashing CEL and then CEL stayed. Car idles ridiculously rough, thought it was just a coil pack but seems to be a lot more. What is going on with my car?
Performance mods:
APR intake (stage 1&2)
SPM track edition turboback
Stage 2 revo software
R8 coilpacks and NGK plugs put in 9-10k miles ago
Have 52k miles on the car if that matters
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This morning, I wanted to drive to work, but all of my coolant was gone. In the last couple of weeks, I had some errors with my speedometer and had it replaced a week ago, which did not fix my problem (the P0722 sometimes still came up).
Could it be that my coolant leaked over the last weeks and somehow messed with my speedometer, or are those most likely independent errors?
My car is a 2000 Jetta VR6 and at this point I don't want to put too much into it any more. If you need more input, let me know.
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I have a 2003 VW GTI VR6. Prior to replacing the transmission there was no brake problems what so ever. Since the transmission was done I get the "Stop Brake Fault" light on the cluster Intermittently. It never seems to happen when braking. I have new brakes and rotors on all 4 corners. As I said this only started happening immediately after the transmission was replaced. I did check the wear sensor on the pad to make sure it wasn't disconnected during the install. Where else should I be looking? Could it be triggered if they didn't bleed the clutch slave properly?
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I bought an 05 golf GL with a 2.0 and 5 speed in January for commuting to work.
Well, recently. I was on my way home from work, I'm an engine tech for Cummins Inc, and I notice my CEL came on and the car stalled multiple times at red lights. So I limped it home, connected my scanner and the fault was "Implausible signal from Mass Air Flow sensor". I cleared the fault code and tried to start the car. Nothing, no crank no start. Just an audible click from under the hood.
I disconnected the battery for 5 min reconnected it and it started fine. Drove it to work the next day, no issues. I tried to start it again and nothing, CEL was on again for the MAF sensor. I pop started it, car ran like hell, rough idle, low power, etc. luckily I have a dualy that I can drive in the mean time.
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After running to operating temp, if the car is turned off then restarted (like you would at a gas station, which is where I notice this) the engine will turn and turn and turn but not fire. I have noticed that stomping on the acceleration will cough it into life during this procedure. This doesn't happen every time and I have recently run high octane gas during a long distance trip.
106K miles...
Recent p0441 fault codes and gas cap warning light...
No other problems or codes...
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2000 Jetta 2.0. 140k miles. Cranked, but would not fire. Sprayed starter fluid... nothing. No spark. Checked fuel pump and fuel pump relay, all is well. I let it sit over night. I tried starting it, ran for 4 to 5 seconds shut off. Disconnected MAF sensor, it ran. Put in a new MAF sensor, back to cranking no fire. Let it sit over night, started up again. Tried to drive, stalled. Unpliged MAF sensor, now its running. Drove around parking lot. Afraid to take it out, don't want to be stranded.
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I have an 02' 2.0 Jetta Wagon, and the A/C is having some issues. Since I know close to nothing about A/C systems, I took it in to a few places to have it looked at. I've had the whole system Evac'd and recharged, and have had the low pressure fitting replaced (apparently there was a slight leak there), and the system is still not working.
The A/C worked fine when I first purchased the car a few months ago. Shortly after my 800 mile trek from Oregon, back to home, the A/C started to only work intermittently. The compressor would engage, then disengage, repeat...It seemed like a bad idea to keep trying to use it in its sad state so I stopped using it altogether. As I said, I had the system emptied and recharged, but it still only works intermittently. It sort of follows a pattern where upon start up it works longer, and switches on and off at shorter intervals, until it doesn't engage at all.
There are no strange noises from the compressor, and when it was hooked up to the machine, it proved to be performing its function well.
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I have a 2001 GTI VR6 5 speed. It has an intermittent no start. When you turn the key on it will start as long as the EPC light was lit before cranking. If that light does not come on, it will not start. I also can't communicate with the ECU via the OBD2 connector if the EPC light does not come on. So I am assuming that the ECU/ECM is not getting power when this condition occurs. Is there an ECU relay that is possibly out? If so, what is its location?
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2.slow bev engine / 2004 golf gl / 105k miles
The car sat in a garage for 9 days. It had no problems before. Now I have a p0441 code that comes back after being cleared, and an intermittent gas cap light. Is there a typical problem that causes this?
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Over the past few weeks my 2000 Jetta GL has been occasionally been grinding on start up. The car starts fine, but it sounds like the starter doesn't realize that the engine is running and it makes that oh so lovely grinding noise for an additional half a second or so. It doesn't do it every time, just when it feels like being ornery. Is the starter going, or what?
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I have a 2002 Jetta TDI Manuel. New to me from brother. While there are some issues I can deal with ....soft touch turned to goo, etc there is one thing I am worried about.
He said the lights(all electrics) will go out intermittently. Head lights, turn signals, radio, interior lights. He says the car runs fine while the electronics are out (except no headlights). Usually only happens for a few seconds but occasionally will last minutes. Longest it has happened is 10 minutes and the lights all come back on by themselves.
What could cause this and what needs to be done for fixing? He is a outboard mechanic and has kept the car up great, but he doesn't like to mess with wiring/electrics. I'm sure he has checked the basics.
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Okay I have a 2000 Jetta GLS VR6. I had the engine replaced after i found out the block was cracked when replacing the heater core. ever since it was replaced the car runs great but it keeps throwing these 4 codes.
p1424 secondary air injection system bank 1 leak detected -intermittent
p0411 secondary air injection system incorrect flow detected
p1603 internal control module failed self test -intermittent
p0134 02 sensor bank 1 sensor no1 no activity -intermittent
The thing that is bugging me is that the sai pump is still running. On cold start it literally sounds like a Dyson vacuum. What i should try.
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