99.5 vw tdi stand. tranny glow plug light blink... check engine lite is on
runs bad at times hasitation dtc 1246 instaled all new gp & relay not fixed . glow plugs look wet when i pulled the old ones out . any help in what may be wrong be great. thanks
I believe that 1246 is needle lift sensor circuit range/performance it's aka VW 17654 code. The glow plug light will show a bunch of faults but the glow plugs never are the cause of bad running after the engine is warmed up. My guess as to why they are wet are it's fuel or oil.
About the light, my guess is a wiring problem. Clean the battery terminals, the glow plug harness connectors, and the plug that is attached to a wire coming from injector #3. Read the injector/nozzle FAQ in the FAQ list at the top of the forum and it'll explain how it works and might give you a clue as to why this fault is being thrown.
A broken or frayed wire could cause this fault. Believe it or not, a bad taillight can also cause the glow plug light to flash. A more serious problem is a bad injection pump or bad nozzles. The nozzles can be cleaned and at your mileage it's a good idea to replace them if they haven't been replaced yet.
If you intend to work on your car any more than checking for codes getting a vag com will help tremendously. An obd2 scan is a good start but you can't check engine timing or other things without a vag com, see here for vag com. http://www.ross-tech.com/ Yiou don't need the expensive cable, the one for $250 is fine. Here's a list of stuff that it does on the TDI http://www.ross-tech.com/vag-com/cars/tdi.html
The hesitation might be a boost leak. Check for loose or broken hoses along the intake tract. Also check all the vacuum lines for frayed ends or cracks or rub throughs. Your car is now 10 years old, give it regular maintenance and it'll take you another 10 years!
The hesitation could be limp mode, there's a writeup here for how to diagnose it.
Here is a list of things that could set a glow plug light from mogolf
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
17970 - Quantity Adjuster (N146): Upper Limit Reached
P1562 - 35-10 - - - Intermittent
It also flashes when an interface tool has put the ECM in 'basic settings' mode
What is the tranny light, do you have an auto? It sounds like you have a handful, to get the tranny light code you might need a vag com, not sure if the generic obd2 scanner can pick up what code that is,
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