Hello, this is my first post so I’m not sure if this is the right thread, but I’ve been having an issue with my 2012 vw Jetta tdi. A few weeks ago it randomly had a check engine, power steering, and blinking glow plug light, as well as loss of speedometer use and randomly going into limp mode. I ran multiple code readers on it and nothing came back. I figured it was the ECM so I bought a new one and had it coded, yet the errors are still present. Does anyone have any idea what may be causing this or if/how I can fix it without bringing it to a mechanic?
Flashing glow plug, power steering, check engine light, speedometer not working, intermittent limp mode
- Thread starter rmedolla
- Start date
P2B
Top Post Dawg
You need to use VCDS, it speaks VW fluently. Without diagnostic codes your guess is as good as mine or anyone else's.
I ran the VCDS and these are the codes I got;
049441 - No Communication with ABS Brake Control Module
U0121 - 002 - - Intermittent - MIL ON
000403 - Fuel Pressure Sensor (G247)
P0193 - 000 - Short to Plus - Intermittent
000144 - Valve for Fuel Metering (N290)
P0090 - 000 - Open Circuit - Intermittent
008852 - Fuel Pressure Regulator Valve (N276)
P2294 - 000 - Open Circuit - Intermittent
009778 - Relay for Fuel Pump 2 (J49)
P2632 - 000 - Open Circuit - Intermittent
009572 - Turbocharger Boost Control Position Sensor Circuit
P2564 - 000 - Signal too Low - Intermittent
008215 - Intake Manifold Flap Position Sensor (Bank 1)
P2017 - 000 - Short to Plus - Intermittent
001029 - EGR Sensor 1
P0405 - 000 - Signal too Low - Intermittent
001158 - Exhaust Gas Recirculation Sensor 2
P0486 - 001 - Electrical Malfunction - Intermittent
000069 - Boost Pressure Control Valve/Solenoid (Bank 1)
P0045 - 000 - Open Circuit - Intermittent
008448 - Throttle Actuator Control Circuit
P2100 - 000 - Open Circuit - Intermittent
000280 - Engine Coolant Temp. Sensor (G62)
P0118 - 000 - Signal too High - Intermittent
000387 - Fuel Temp. Sensor A (G81)
P0183 - 000 - Open or Short to Plus - Intermittent
005184 - EGR Valve (N18)
P1440 - 000 - Open Circuit - Intermittent
001114 - EGR Valve 2 (N213)
P045A - 000 - Electrical Malfunction - Intermittent
008200 - Intake Manifold Flap; Bank 1
P2008 - 000 - Electrical Malfunction - Intermittent
008450 - Throttle Valve Actuator Module (J338): Motor Circuit
P2102 - 000 - Signal Low - Intermittent
001592 - Throttle Body Actuator Bank 1 (J338)
P0638 - 000 - Implausible Signal - Intermittent
049478 - No Communication with Diagnostic Gateway
U0146 - 003 - - Intermittent
x1800MODMY360x
Veteran Member
You have a wiring issue or a lot of dead sensors / modules.
P2B
Top Post Dawg
... and/or issues related to changing ECUs.
I would clear codes and see which ones come back.
BobnOH
not-a-mechanic
Yes, this^
Sometimes a weak battery will trigger multiple erroneous codes.
Sometimes a weak battery will trigger multiple erroneous codes.
ZippyNH
Veteran Member
Sounds kinda like what mine did during a start with a battery that barely started the car.....
Feeling lucky?!
But honestly could be a wiring issue etc.
Guess you could unleash the parts cannon....or get special softwares, or simply pay somebody a diagnostic fee.
Feeling lucky?!
But honestly could be a wiring issue etc.
Guess you could unleash the parts cannon....or get special softwares, or simply pay somebody a diagnostic fee.
BobnOH
not-a-mechanic
Load test the battery or charge then check with a hydrometer suitable for the task.
P2B
Top Post Dawg
Or just look at the hydrometer which is built in to any automotive battery made in the last 20 years.
BobnOH
not-a-mechanic
Never seen battery with 6 hydrometers. You need to check all 6 cells to one-hundredth of a gravity.
P2B
Top Post Dawg
Maintenance free batteries typically dont provide a way to access the individual cells, that's why they have built in hydrometers.
oilhammer
Certified Volkswagen Nut & Vendor
Must be different in Canada, I see very few batteries with those. Many of the VAG ones use them, though.
The Motorcraft branded ones in my Ford trucks don't. None of the [crappy] AC-Delco branded ones we have here at the shop don't. The Toyota (JCI) branded one I just installed in a Highlander yesterday didn't. The seven batteries in our core pile don't, either. *shrug*
To the OP, in addition to the obvious voltage (and ground) checking, I'd also look around the engine compartment for signs of rodent activity, especially under the underhood fusebox area, where several harnesses travel including the engine harness.
The Motorcraft branded ones in my Ford trucks don't. None of the [crappy] AC-Delco branded ones we have here at the shop don't. The Toyota (JCI) branded one I just installed in a Highlander yesterday didn't. The seven batteries in our core pile don't, either. *shrug*
To the OP, in addition to the obvious voltage (and ground) checking, I'd also look around the engine compartment for signs of rodent activity, especially under the underhood fusebox area, where several harnesses travel including the engine harness.