Cruise control not working

worldwide73

Well-known member
Joined
Mar 12, 2012
Location
Richmond, IN
TDI
99.5 Jetta TDI GLS
99.5 tdi, 5 speed.


History, worked when I bought the car.. Did a timing belt change, and Egr delete. Now it doesn't work. I checked the fuses #14/#15 both good. I haven't checked the clutch pedal sensor, I assume thats easy.

I have a vag-com so what do I need to check in there to see if its working or???

I searched and I couldn't find much in the forum

thanks for any help
 

aNUT

Vendor , w/Business number
Joined
Nov 29, 2006
Location
Boulder, Colorado
TDI
'01 TT (ALH-ish), B7 Audi gasser, '05 Golf
Use engine measuring blocks 006 to check stalk and pedal switches. Any buttons that don't make the digits change are likely faulty.
 

where2

Veteran Member
Joined
Oct 29, 1999
Location
North Palm Beach, FL, USA
TDI
One '13 JSW_TDI & One '04 Variant_TDI
In my case, on my MkIV after the dealer replaced the brake light switch under warranty, the cruise control no longer worked. I traced it to a faulty clutch pedal switch adjustment. The switch plunger was somehow messed with when the brake pedal switch was replaced. I adjusted the plunger, and all was working again.
 

worldwide73

Well-known member
Joined
Mar 12, 2012
Location
Richmond, IN
TDI
99.5 Jetta TDI GLS
Ok I checked the 006 blocks, all buttons working on that screen. Checked all bulbs, the only bulb that doesn't work is the trunk light bulb for some reason? The bulb looks good though. I checked all turn signal, brake and back up lights all working. I checked the clutch switch, it looked good, re-adjusted and still nothing.

It worked at one point and all the button are throwing signal according to vag-com.. I'm lost now
 

worldwide73

Well-known member
Joined
Mar 12, 2012
Location
Richmond, IN
TDI
99.5 Jetta TDI GLS
OK I figured it out.. the cruise control block is 001 when on, and 101 when the button is pushed, but needs to go to 011 to be engaged. Turn the turn signal right and it engages.. switch is bad!

Thanks for all the pointers.
 

keendog

Well-known member
Joined
Mar 18, 2011
Location
Jackson, WY and Bozeman, MT
TDI
1998 Black Jetta TDI aka "Chuck Norris" for its ninja like driving abilities.
I sometime have to do something I like to call the toe mod on my clutch pedal. The pedal sags a bit, and is just out of position for the cruise switch's liking. A brief hold with my left toe to set the pedal back up and the cruise works great until I hit a big bump or sometimes on a hill it will cut out.

probably a better way but I have replaced the switch and the problem kept on.
 

evolDiesel

Veteran Member
Joined
Feb 15, 2011
Location
PACIFIC NW
TDI
2011 JSW 6MT (and several others in the past)
OK I figured it out.. the cruise control block is 001 when on, and 101 when the button is pushed, but needs to go to 011 to be engaged. Turn the turn signal right and it engages.. switch is bad!
For several months my CC works intermittently. I read somewhere a while back that the solution is typically to replace the stalk. I plan to do it soon as I found one online for $90.
 

evolDiesel

Veteran Member
Joined
Feb 15, 2011
Location
PACIFIC NW
TDI
2011 JSW 6MT (and several others in the past)
Found a new stalk on ebay for $48 shipped. I will install this Friday and report back.
 

farmer 4 baby bear

New member
Joined
Aug 14, 2012
Location
Canada
TDI
2004 Jetta
loosing speed while on cruise

I'm a new member. I have a question. We have a 2004 Jetta TDI,when the cruise control is engaged it loses speed when going up an incline and when you push on the acelerator it regains the proper speed. Our vw dealer said our fuel pumps were in need of replacing. I replaced them but the problem still exists. Does anyone have a suggestion?
 

jettawreck

Top Post Dawg
Joined
Aug 2, 2004
Location
Northern Minnesota-55744
TDI
2001 Jetta and 2003 Jetta
I'm a new member. I have a question. We have a 2004 Jetta TDI,when the cruise control is engaged it loses speed when going up an incline and when you push on the acelerator it regains the proper speed. Our vw dealer said our fuel pumps were in need of replacing. I replaced them but the problem still exists. Does anyone have a suggestion?
Fuel pump(s)?? Which ones, the lift pump the tandem pump or both?
How is the performance in general?? Have you tested the MAF sensor? Common for failed MAF to cause it to not hold speed on hills.
 

farmer 4 baby bear

New member
Joined
Aug 14, 2012
Location
Canada
TDI
2004 Jetta
cruise control

Thank you for your response. I replaced the lift pump and the tandem pump. The performance is ok. How do you check the maf sensor? What other things could cause this to occur?
 

farmer 4 baby bear

New member
Joined
Aug 14, 2012
Location
Canada
TDI
2004 Jetta
Fuel pump(s)?? Which ones, the lift pump the tandem pump or both?
How is the performance in general?? Have you tested the MAF sensor? Common for failed MAF to cause it to not hold speed on hills.
I replaced both the lift pump and the tandem pump. The performance is ok. I haven't checked the maf sensor. How do you check the maf sensor? Could it be that the intake manifold needs cleaning?
 

jettawreck

Top Post Dawg
Joined
Aug 2, 2004
Location
Northern Minnesota-55744
TDI
2001 Jetta and 2003 Jetta
I replaced both the lift pump and the tandem pump. The performance is ok. I haven't checked the maf sensor. How do you check the maf sensor? Could it be that the intake manifold needs cleaning?
MAF sensor can be checked w/VCDS by logging the actual vs requested values. Or, w/o VCDS, you can unplug the sensor and take it for a drive over a route you are familiar with how the car normally runs. If performance is about the same or better its a pretty good bet the MAF is bad.
Intake clogging check?? You have to take the charged air tube off the EGR inlet (better yet take the EGR off for a better look) and inspect it with a light. Don't worry about an oily mess, thats normal. Look for obvious restriction downstream of the EGR.
 

farmer 4 baby bear

New member
Joined
Aug 14, 2012
Location
Canada
TDI
2004 Jetta
cruise control losing speed on hills

Still haven't solved criuse control losing speed on hills. Just bouht vcds and ran autoscan. Says our lateral accelerometer is not working properly. This is used with the electronic stability program on our car. Do you think this sensor could cause the loss of speed on cruise?
 

mtbr297

Vendor
Joined
Nov 3, 2002
Location
Bogata TX., USA
TDI
2015 Golf Wagon TDI, Seat Leon FR PD 150 6 speed.
I had one come in the shop today with cruise inop. Found a single contact bulb in a double contact hole. It made the brake light come on when the head/tail light came on.
 

DanVito

Active member
Joined
Sep 20, 2008
Location
Lakeland, FL
TDI
2004 Jetta Wagon, BEW, 242k miles & counting
Erratic cruise control

Farmer: I'm having a very similar problem with my 2K4 Jetta Wagon TDI. Actually, it's pretty much the same as yours, but I don't necessarily need a hill. It will start losing speed on a flat stretch. Some times are better than others, but it's a regular problem.

I took it to the dealer, who said they found a "code" indicating a bad "crank speed sensor". That was replaced, but to no affect. Finally, they said the only option was to replace the computer for around $1600, but there was no guarantee it would solve the issue. Translation: They have no clue.

So, I've been living with it, but would prefer fixing it. I've heard the mass airflow sensor mentioned before re: cruise control issues, but I wouldn't know a MAS if it bit me. Or, where the EGR valve is, either. But, I'm willing to learn.

I'd be very interested in what you learn about your issue and any suggestions anyone else may have.
 

worldwide73

Well-known member
Joined
Mar 12, 2012
Location
Richmond, IN
TDI
99.5 Jetta TDI GLS
My MAF went bad and I unplugged it. With cruise control it would lose speed going uphill, whereas with the MAF working it would not.
 

Bugwithaltitude

Veteran Member
Joined
Jan 10, 2006
Location
Ft Collins, CO
TDI
2005 Blue Lagoon New Beetle GLS TDI
Mine does the same thing. Loses speed sometimes with CC but if I tap the accelerator it'll return to the set speed. This happens quite frequently, more often on hills, but not always. I went through the whole limp mode, MAF testing thing about a year ago b/c she lost power badly and it was the turbo valve. This feels very different. This is not a power issue.

About a year after I bought her she would suddenly take off in CC, accelerating rapidly and only limited by the gear! That was interesting. Happens every couple months or so.
 

ricaroo

Well-known member
Joined
Feb 20, 2011
Location
new hampshire
TDI
2011 jetta sportwagen
My Glow plug light blinks, my cruise control doesn't work and my brake lights stay on.

dealer installed a new brake light switch, I installed new brake light bulbs and nothing has changed. dealer says no codes?

2011 DSG TDI Jetta sport wagon 59,000 miles

Any advice?
 

Mongler98

Top Post Dawg
Joined
Mar 23, 2011
Location
COLORADO (SE of Denver)
TDI
98 Jetta TDI AHU 1.9L (944 TDI swap in progress) I moved so now i got nothing but an AHU in a garage on a pallet.
I know its an old thread but i dont think anyone figured out what i just learned.

You know how a bad brake light will mess up the CC, well you also know how if you have a bad turn signal it will flash rapidly letting you know you have a bad bulb. Ok

if you put led's into the turns they blink fast too, the car does not sense that it has bulbs as the led's have such a different output voltage. Ok so i have LED's on every part of the car, brakes and turns and what not. i just now JUST NOT added led's to the 3rd brake light and now that every bulb is an led, the cruise control stopped working. I swapped out ONLY the left or Right bulb and it fixed it same with just the 3rd brake light. I wired in a 3rd brake light bulb in the rear tray , hidden, just to make the system happy. BAM cruise control works again. LOL
 

OKMD

Member
Joined
Dec 28, 2004
Location
OK
TDI
2004 Jetta
Farmer 4 Baby Bear- did you ever figure this out? I have an '04 Jetta PD TDI with the exact same problem. I've got 251k miles on it and have been trying to figure this out for the last 100k. At first no mechanic believed me; they would just tell me to downshift. I told them nudging the gas to fix a problem means it has nothing to do with shifting. My lift pump was bad, but replacing it didn't fix this. Replaced the tandem pump a year later, but that didn't fix the problem. I don't have any lights out anywhere. I've never had any lights on on the dash. I don't have a code reader and I don't know if any of the mechanics ever checked for an error code, so that's probably the next step, though that doesn't appear to have revealed an easy fix for anyone else.

The only thing I've noticed is that the problem gets worse as the fuel tank gets lower. On a completely full tank, it may not do it at all, or only intermittently.

Thoughts?
 

jettawreck

Top Post Dawg
Joined
Aug 2, 2004
Location
Northern Minnesota-55744
TDI
2001 Jetta and 2003 Jetta
C C stopped working after D M F replaced. Is there a vacum line I can check?
This thread is over 6 years old so a new thread about your issue is probably more appropriate, but FYI the cc isn't vacuum operated, it's all electronic. Perhaps a wire damaged or a connector left open.
 

2001BeetleNM

Member
Joined
Jul 1, 2021
Location
Albuquerque
TDI
2001 Beetle TDI 1.9
I know its an old thread but i dont think anyone figured out what i just learned.

You know how a bad brake light will mess up the CC, well you also know how if you have a bad turn signal it will flash rapidly letting you know you have a bad bulb. Ok

if you put led's into the turns they blink fast too, the car does not sense that it has bulbs as the led's have such a different output voltage. Ok so i have LED's on every part of the car, brakes and turns and what not. i just now JUST NOT added led's to the 3rd brake light and now that every bulb is an led, the cruise control stopped working. I swapped out ONLY the left or Right bulb and it fixed it same with just the 3rd brake light. I wired in a 3rd brake light bulb in the rear tray , hidden, just to make the system happy. BAM cruise control works again. LOL

Thanks man. I put LED on one of my turn signals and CC works 50% of the time. Do you think that could affect a glow light?
 
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