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2009 Elantra lost power while driving #4941530
12/02/18 12:33 PM
12/02/18 12:33 PM
Joined: Nov 2010
Posts: 321
Pennsylvania
schuylkill Offline OP
schuylkill  Offline OP

Joined: Nov 2010
Posts: 321
Pennsylvania
So my son called me Thursday night and he had the wife's Elantra out to visit a friend. Car has about 30K miles, sits alot. Original battery. While he was driving, after having started it twice that night, he lost all power. He's not sure which lights did what on the display, he was trying to get off of the road safely. Auto transmission. He got into a driveway and called. I bought a new battery and went to get him and we installed the battery. Started right up and we drive home about 30 miles. Now the battery reads 11.49 volts (11.78 yesterday before I started it.) At the battery when running read at 11.78 volts. With the car off 0 ohms between negative post and alternator body. With power on but not running 9.48 volts at power lead at alternator. Should this 9.48 volts be higher?

Do you think it's safe to assume the car needs an alternator?


09 Elantra 32K Bulk Toyota OE
12 Elantra GLS manual 299K TGMO Fram Ultra
Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941536
12/02/18 12:40 PM
12/02/18 12:40 PM
Joined: Aug 2018
Posts: 414
NH
wdn Offline
wdn  Offline

Joined: Aug 2018
Posts: 414
NH
The car is still under Hyunda powertrain warranty so I would bring it to the dealership and let them worry about it. Alternator is part of the powertrain.

Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941537
12/02/18 12:40 PM
12/02/18 12:40 PM
Joined: Oct 2006
Posts: 1,948
Oshawa, Ont. Canada
irv Offline
irv  Offline

Joined: Oct 2006
Posts: 1,948
Oshawa, Ont. Canada
Alternator time. If working properly, you should be seeing 14+ volts at the battery. Likely your old battery is still good?


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2013 Ram 5.7 L Hemi Bighorn QC 4x4
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Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941539
12/02/18 12:40 PM
12/02/18 12:40 PM
Joined: Dec 2004
Posts: 7,403
beaver land EH?
Quest Offline
Quest  Offline

Joined: Dec 2004
Posts: 7,403
beaver land EH?
Alternator, simple.

Q.


"Internet discussion boards act as echo chambers for conspiracy dittoheads" A.Allen
Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941541
12/02/18 12:41 PM
12/02/18 12:41 PM
Joined: Oct 2008
Posts: 13,445
The Old North State
Sayjac Offline
Sayjac  Offline

Joined: Oct 2008
Posts: 13,445
The Old North State
Originally Posted by schuylkill
…. At the battery when running read at 11.78 volts....
That's too low. When running should read in the ~13.5-14.5 range. Sounds a like a bad alternator.

Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941563
12/02/18 01:11 PM
12/02/18 01:11 PM
Joined: May 2009
Posts: 887
Hawaii, USA
anndel Offline
anndel  Offline

Joined: May 2009
Posts: 887
Hawaii, USA
1. Check the sepentine belt.
2. Check alternator.


1993 Toyota 4x4 p/u, 2.4L 22RE 4 cyl - M1 EP 10W-30, Fram UG Filter
2005 Toyota Avalon XL, 3.5L V6, Amsoil XL 5W-30, Amsoil Filter
2014 Toyota Tacoma 4.0L V6, Amsoil SS 5W-30, Yota OEM Filter
Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941569
12/02/18 01:17 PM
12/02/18 01:17 PM
Joined: Aug 2008
Posts: 25,014
ON, Canada eh?
StevieC Offline
StevieC  Offline

Joined: Aug 2008
Posts: 25,014
ON, Canada eh?
These vehicles have smart charging systems so it's not uncommon to see 12.3 volts up to 14.7 volts at various times. That said your voltage is too low and sounds like a defective alternator. I would fully charge the battery out of the vehicle (or with the positive lead disconnected from the vehicle). Test the voltage after allowing it to rest for 1/2 hour after charging with the charger disconnected. Then install or reattach the battery lead and take for a drive with all the accessories on for about 1/2 hour but stay close to home. If the voltage is low again when you return the alternator is toast.

If the vehicle is still under warranty then I would just fully charge the battery and take it to Hyundai. Explain that you charged the battery to get it there but that the voltage keeps going low and the vehicle is dying, so they don't think it's operating normally when you get there.

Last edited by StevieC; 12/02/18 01:19 PM.

'18 Caravan - 36k KM - AMSOIL SS 0w20, Fram Ultra, TC-W3 500:1
'06 Santa Fe - 535k KM (Retired)

There is no such thing as "lifetime" fluids! mad
Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941837
12/02/18 06:24 PM
12/02/18 06:24 PM
Joined: Nov 2011
Posts: 5,184
MTL, CANADA
Rolla07 Offline
Rolla07  Offline

Joined: Nov 2011
Posts: 5,184
MTL, CANADA
Yeah, shut off during driving id assume alt.


2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967
2015 Toyota Venza Parisian Blue Pearl 25k miles
TGMO 0W20 & OEM filter

Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941860
12/02/18 06:56 PM
12/02/18 06:56 PM
Joined: Nov 2010
Posts: 321
Pennsylvania
schuylkill Offline OP
schuylkill  Offline OP

Joined: Nov 2010
Posts: 321
Pennsylvania
Thanks guys I'll check on the warranty. Then I'll decide if it's worth the hassle and time and inconvenience dealing with the dealership. I think it's the alt too.


09 Elantra 32K Bulk Toyota OE
12 Elantra GLS manual 299K TGMO Fram Ultra
Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941870
12/02/18 07:05 PM
12/02/18 07:05 PM
Joined: Aug 2003
Posts: 13,811
NE,Ohio
Rand Offline
Rand  Offline

Joined: Aug 2003
Posts: 13,811
NE,Ohio
I'm not sure alternator is covered.. that is probably under the basic warranty but not powertrain.


2019 Jeep Cherokee Trailhawk 2.0T
Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941928
12/02/18 07:58 PM
12/02/18 07:58 PM
Joined: Dec 2003
Posts: 10,346
Florida, Cape Coral
Eddie Offline
Eddie  Offline

Joined: Dec 2003
Posts: 10,346
Florida, Cape Coral
I suspect the alternator falls under the typical 3/36K warranty. Ed


2014 CX5 Touring 2.5L :-)
Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941964
12/02/18 08:32 PM
12/02/18 08:32 PM
Joined: Aug 2008
Posts: 25,014
ON, Canada eh?
StevieC Offline
StevieC  Offline

Joined: Aug 2008
Posts: 25,014
ON, Canada eh?
Chrysler replaced my alternator that died in my Journey while I was in Florida. I had less than that mileage on mine.


'18 Caravan - 36k KM - AMSOIL SS 0w20, Fram Ultra, TC-W3 500:1
'06 Santa Fe - 535k KM (Retired)

There is no such thing as "lifetime" fluids! mad
Re: 2009 Elantra lost power while driving [Re: schuylkill] #4941993
12/02/18 08:52 PM
12/02/18 08:52 PM
Joined: Jan 2003
Posts: 947
Colorado
newtoncd8 Offline
newtoncd8  Offline

Joined: Jan 2003
Posts: 947
Colorado
I hope you can get it covered, but based upon their website, it doesn't look promising. The powertrain is:

Engine: (Cylinder block/head and all internal parts, manifolds, timing gears, timing chain, timing cover, gaskets and seals, oil pump, water pump, flywheel, oil
pan assembly, rocker cover and engine mounts, and turbocharger.)

Transmission / Transaxle and Drivetrain: (Case and all internal parts; axle shafts (front/rear); constant velocity joints; front/rear hub bearings; propeller shafts; seals and gaskets; torque
converter and converter housing; transfer case for AWD models; and rear differential for Santa Fe, Tucson, Veracruz AWD, Genesis and Equus models)


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84 Honda Accord, 70 Pontiac LeMans,
62 Ford Galaxy 500
Re: 2009 Elantra lost power while driving [Re: wdn] #4942068
12/02/18 09:52 PM
12/02/18 09:52 PM
Joined: Feb 2013
Posts: 11,597
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline

Joined: Feb 2013
Posts: 11,597
Phoenix, AZ
Originally Posted by wdn
The car is still under Hyunda powertrain warranty so I would bring it to the dealership and let them worry about it. Alternator is part of the powertrain.

Powertrain warranty covers things that oil touches.

Alternators are definitely not lubricated by engine oil.


2015 Hyundai Sonata 2.4L 99k STP Synthetic HM 10w30 & OEM
2000 Toyota Camry 2.2L 234k Mobil Super HM 10w40 & Fram Ultra
1996 Jeep Cherokee 4.0L 149k Mobil 1 HM 10w40 & Fram Ultra
Re: 2009 Elantra lost power while driving [Re: wdn] #4943305
12/04/18 12:26 PM
12/04/18 12:26 PM
Joined: Nov 2010
Posts: 838
VA
Thax Offline
Thax  Offline

Joined: Nov 2010
Posts: 838
VA
Alternator is not under powertrain. Falls under bumper to bumper, which is 6years/60,000K for Hyundai. Alternators on these elantras are cheap and easy to do , much less hassle than taking to the dealership.


2000 Ford Explorer Limited 5.0L AWD
2018 KIA Soul EX 2.0L
ASE P2 Parts Specialist
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