Recent Topics
New struts don't have slotted holes
by 92saturnsl2 - 10/20/19 02:37 PM
changed oil on the ioniq today
by WhyMe - 10/20/19 02:33 PM
Rear Brake Pistons
by Propflux01 - 10/20/19 02:18 PM
Mobil Super Synthetic on 'Clearance' at AA
by pbm - 10/20/19 01:54 PM
Weed Killer Time Frame
by Warstud - 10/20/19 01:38 PM
Liking the j frame
by Red91 - 10/20/19 12:29 PM
44.5K 2 Year Prime Guard cut open NSFBitog
by Ursatdx - 10/20/19 12:21 PM
Hollywood Casino 400 at Kansas Speedway
by bdcardinal - 10/20/19 12:18 PM
What were they thinking? Toyota
by perfect_oil - 10/20/19 12:11 PM
Used Car Inspection: DIY vs Pay a Shop?
by nobb - 10/20/19 11:55 AM
Obd2 dongle for iOS?
by buck91 - 10/20/19 11:51 AM
Tie rod end replacement
by 92saturnsl2 - 10/20/19 11:18 AM
Need steering box and pump
by 007 - 10/20/19 11:15 AM
Leather conditioner
by dawgn86 - 10/20/19 10:15 AM
Rockville MD fall car show pictures
by atikovi - 10/20/19 09:21 AM
Battery Jumpstarter Recommendation
by dkryan - 10/20/19 08:50 AM
Why the guard on wheel balancers?
by atikovi - 10/20/19 07:18 AM
Newest Members
lexus4life, visco17, Patrick1201, BloodyButUnbowed, Kazuhiro
69618 Registered Users
Who's Online Now
108 registered members (2002 Maxima SE, 53' Stude, Alfred_B, 92saturnsl2, 16 invisible), 2,242 guests, and 25 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics296,220
Posts5,093,771
Members69,618
Most Online3,532
Jul 30th, 2019
Donate to BITOG
Print Thread
Hop To
Check Engine light vs fault #5234516 10/09/19 06:38 AM
Joined: Jul 2015
Posts: 5,282
M
madRiver Offline OP
OP Offline
M
Joined: Jul 2015
Posts: 5,282
I have a 2018 Tiguan and the only very occasional issue is backing up with a cold/cool engine it hesitates and near stalls and then catches back. It has never illuminated a check engine light.

Does the computer store codes but not illuminate the check engine light?

There is a specific TSB for this and would like to get addressed:
[Linked Image from uploads.tapatalk-cdn.com]

Re: Check Engine light vs fault [Re: madRiver] #5234568 10/09/19 07:32 AM
Joined: Apr 2010
Posts: 2,641
A
atikovi Online Content
Online Content
A
Joined: Apr 2010
Posts: 2,641
Originally Posted by madRiver
Does the computer store codes but not illuminate the check engine light?


Sure does. Could have pending codes stored that won't illuminate the CEL, yet. Could have transmission codes stored some of which won't illuminate the CEL.

Re: Check Engine light vs fault [Re: madRiver] #5234594 10/09/19 08:02 AM
Joined: Sep 2015
Posts: 2,185
M
mk378 Offline
Offline
M
Joined: Sep 2015
Posts: 2,185
If the ECU loses memory backup power it may run badly the next time the engine is started until it can recalibrate. The only other symptom of that would be the emission ready codes become not ready for a time. To troubleshoot a highly intermittent problem you really should have your own code scanner.

Last edited by mk378; 10/09/19 08:03 AM.
Re: Check Engine light vs fault [Re: mk378] #5234811 10/09/19 11:21 AM
Joined: Jul 2015
Posts: 5,282
M
madRiver Offline OP
OP Offline
M
Joined: Jul 2015
Posts: 5,282
Originally Posted by mk378
If the ECU loses memory backup power it may run badly the next time the engine is started until it can recalibrate. The only other symptom of that would be the emission ready codes become not ready for a time. To troubleshoot a highly intermittent problem you really should have your own code scanner.


I understand for self diagnosis however this vehicle is covered by a 6yr/72k mile warranty. My hope is faults not CEL are in fact stored. I am unclear if a dealer will perform a TSB unless there is actual fault they can reproduce or diagnose.

Re: Check Engine light vs fault [Re: madRiver] #5234901 10/09/19 12:57 PM
Joined: May 2019
Posts: 2,234
M
Mad_Hatter Offline
Offline
M
Joined: May 2019
Posts: 2,234
Originally Posted by madRiver
I am unclear if a dealer will perform a TSB unless there is actual fault they can reproduce or diagnose.

They won't. A TSB isn't an actionable item until there's a bona fide fault.

If you don't have an OBD2 go to AZ and see if they can pull up any pending faults.

It would be nice to know if your O2's are still in closed loop when this happens. In closed loop you're running rich, maybe the rich air/fuel is causing a stall?? With an OBD2 you could monitor such things in real time.

Just a hunch...idle control maybe? At cold startup you're idling high then you put it into gear and the rpms drop too low, momentarily, causing it to almost stall out??.. check out the rpms change from P to D when cold...is it dipping well below 600 rpms for a moment?

Last edited by Mad_Hatter; 10/09/19 12:58 PM.
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™