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Old June 13th, 2018, 20:48   #1
miltoncf
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Join Date: Jan 2009
Location: arizona
Default No codes found for blinking glow plug light

Hello,
Autozone used a cheap OBD2 scanner that had to plugged into a PC after doing the scan, and O'Reilly used a stand-alone Bosch scanner. Neither one found a code. However Autozone noticed that my R+L brake lights were out, with the centre one still working. As my 2003 TDI had the brake light switch recall work done in 2007, should I be having this problem? In other words, did the dealer put in a switch identical to the one that was to be replaced? They did just that when replacing a faulty temperature sensor that went out at 40k, only to have it go bad again at 80k, and even after replacing it again, it lit up the red temp. light like clockwork at 120k, yet it did disappear after something else was fixed. I suppose a real VAG scanner should be used, but should the light be flashing when the brake lights are out with the new & improved brake light switch?
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Old June 13th, 2018, 20:54   #2
STDOUBT
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I'm sorry I didn't save the name of the tdiclub member that posted this, but I saved it for a reference. Here ya go:

Quote:
Causes of a flashing glow plug light
Because this is a frequently asked question, I went digging through info for '01 ALH and made the followin
g list of known reasons for the glow plug light to flash. They are listed with the VW code and generic rea
der P code.

00741 Brake pedal monitoring - implausible signal
01044 Control unit incorrectly coded
16705/P0321 Engine speed sensor - implausible signal
16706/P0322 Engine speed sensor - no signal
16955/P0571 Brake light switch (F) - implausible signal
17653/P1245 Needle lift sender (G80) - short to earth
17654/P1246 Needle lift sender (G80) - Implausible signal
17655/P1247 Needle lift sender (G80) - Open circuit/short to positive
17762/P1354 Modulating piston movement sender (G149) - electrical fault in current circuit
17969/P1561 Metering adjuster (N146) - control difference
17978/P1570 Engine control unit blocked
18020/P1612 Control unit incorrectly coded
18026/P1618 Glow plug relay (J52) - short to positive
18027/P1619 Glow plug relay (J52) - open circuit/short to earth
18040/P1632 Accelerator position sender - voltage supply

It also flashes when an interface tool has put the ECM in 'basic settings' mode.

There may be more; these are the ones I found documented.
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Old June 14th, 2018, 04:01   #3
JETaah
 
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Did you check the bulbs and fuses for the brake lights?
A failure in that system will cause a flashing glow plug light.
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Old June 14th, 2018, 04:24   #4
AndyBees
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The two brake light bulbs being out is the cause of the flashing GP light. (should be on the list)

The ECU monitors the left and right brake lights but not the top center light. When both go out is the prompt for the ECU to send the cue for the GP light to flash.

MoGolf originally put that list together. I expanded it a bit and from time to time posted it. I don't have it on this laptop.
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Old June 14th, 2018, 08:16   #5
JB05
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Yep, MOGolf is the OP to the above mentioned thread. He has other informative threads; as well.
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Old June 14th, 2018, 08:58   #6
BobnOH
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Believe that list was for CEL accompanied by flashing GP.
May not be a code for bulbs. I do know the bulbs/sockets can be finicky
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Old June 14th, 2018, 10:44   #7
miltoncf
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Thanks for the replies. As it's unlikely that the two light blew at the same time or are wired in series, I'll check the fuse.
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Old June 14th, 2018, 11:04   #8
BobnOH
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Also check the bulb sockets, clean and carefully bend the bottom tang up just a tad.
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Old June 14th, 2018, 21:08   #9
AndyBees
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If only one bulb is blown, the GP will not flash. If both are blown the GP will flash, and if I remember correctly, there will not be a CEL.

I have a "dummy" single bulb set-up under the back seat of my 84 Vanagon with the ALH for the ECU to monitor. It is happy and there's no flashing GP light (Yep, I installed the Jetta cluster..)

If there is no current going through the bulb filament, the GP will flash. Also, LEDs and the ECU do not get along. Seems someone posted how to use a resister to fool the ECU. Not sure how that works or would inform you if the LED brake light quit working
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Old June 15th, 2018, 02:58   #10
Tdijarhead
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I like to keep a couple of extra bulbs around I’m afraid I’d have replaced the bulbs and checked the sockets already on both sides.

They didn’t fail together one died about a 2 months ago and the other went out a week or so ago and it’s just been noticed.
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Old June 15th, 2018, 03:21   #11
oilhammer
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I had BOTH the headlight bulbs on my Mazda pickup blow suddenly at the same time.... saw it happen, I know for sure, because the truck was in the driveway up against the closed garage door, wife was with me. 5am, 3 degrees, dark winter morning.

So never assume both bulbs cannot go at once. However, it is FAR more likely I agree that one has been bad for a while and finally the other went. While we do have biannual inspections here, we at the shop always check lights on every car we pull in here, no matter what it is here for. And there is NEVER a day that goes by that we don't find a vehicle with a bulb out somewhere. Good habit to try and check them periodically.
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