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Glow Plug Lit Up and No Power

Glow Plug Lit Up and No Power

 
Old 06-07-2019, 09:56 AM
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Default Glow Plug Lit Up and No Power

Searching for diagnostic help on 2015 Q5 TDI. Emissions fix at about 64K and currently have about 76k miles. Driving 3 hours at 70+ mph (I know. So slow. But that's not today's problem.) After rest stop, vehicle had no acceleration power. Backed into rest area, shut down, and restarted. Power OK. Drove about 15 minutes and lost power and saw glow plug light steadily illuminated. Got off highway and shut off. When restart, light did not reappear and had power. Found nearby Audi dealer. Was told the code showed: Exhaust Gas Recirculation System Malfunction. Dealer has had vehicle for a week and reports being unable to get problem to recur and therefore does not know what to do next. Dealer reports taking vehicle at highway speed for several trips (perhaps 30 miles each way) without problem recurring. Dealer is in rural area about 3 hours from my home. Besides not having fix, I'm concerned about being stranded on way home. Would appreciate thoughts on likely causes and likely ways for dealer to determine if those causes are at work. Thanks for your help.
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Old 06-08-2019, 12:40 PM
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The no power behavior sounds like limp mode, which the engine control software activates under many different triggers -- it allows one to "limp" to a safe location using reduced operating capabilities. Shutting the ignition off, then back on, resets the mode and power is again available -- until limp mode is re-triggered. Many things can cause limp mode but if the dealer can't get it to happen again it may be difficult for them to get to the root cause of the problem. The EGR malfunction may or may not be the cause, it could just be a symptom.

For example we had a 2009 Touareg TDI that would go into limp mode. I scanned it multiple times, received at least 4 different error codes, none of which were the root cause. Might consult the dealer and ask their opinion on trying to drive it home with someone following you, having it towed back, or leaving it there until they can find out what's wrong. Not recommending it to you, but we caravaned that Touareg 900 miles from where we bought it (while on vacation), to home, but it only went into limp mode a couple of times over the trip. In any case, good luck.

Last edited by Tom B.; 06-08-2019 at 12:49 PM.
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Old 06-09-2019, 11:01 AM
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Tom - Thanks so much for sharing your experience. Short of flat-bedding, I may well be following your example of limping, shutting down, restarting, and I hope going a considerable distance before a recurrence of limp mode. Vehicle will stay at dealer for at least another week. Dealer is driving it. So maybe it will recur. Too bad that so many different causes can generate the same code. But I do appreciate your giving me hope that I may well be able to get the car to my home dealer. Thanks.
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Old 06-13-2019, 03:08 AM
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Good luck, let us know how things turn out.
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