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2012 Hyundai veloster
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Discussion Starter #1
Has anyone happen to have/had any issues with the vehicle's antitheft module. ie: car starts but won't shift into into any gear. Engine is running but no tacho signal to dash, just stays at 0. Only fix I've found so far is to either shut it off and unplug the battery to rest or shut off get out lock doors, then unlock get back on and then restart the car. Any help would be appreciated. Thanks in advance.
 

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2012 Hyundai veloster
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13 Posts
Discussion Starter #3
It has a battery that is only two years old. Will get it tested as soon as possible. Just to be sure.
 

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Testing from an auto parts store are bs. All they test is the internal resistance.

Use a multimeter and see what the resting voltage is in the morning before you start the car. Should be no less than 12.4 volts.

Have someone start the car while you look at the voltage drop. Note the drop. Should not go below 9.5 volts.

After the car warms up and stabilizes note the voltage at idle and then at 2000rpm. Voltage at idle 12.9 volts minimum, 14volts to 15 volts at fast idle.

***
 

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2012 Hyundai veloster
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Discussion Starter #10
Testing from an auto parts store are bs. All they test is the internal resistance.

Use a multimeter and see what the resting voltage is in the morning before you start the car. Should be no less than 12.4 volts.

Have someone start the car while you look at the voltage drop. Note the drop. Should not go below 9.5 volts.

After the car warms up and stabilizes note the voltage at idle and then at 2000rpm. Voltage at idle 12.9 volts minimum, 14volts to 15 volts at fast idle.

***
Sorry for taking so long. At rest battery is a little low at 12.1v. When staring it only drops to 10.3v. Then after it warms up and at idle it sits at 14.2v, then while revving 14.6v.
 

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At 12.1 volts, the battery is less that 50% charged or conversely 50% discharged. The alternator is working fine. The drop while starting is within standard.

A battery can meet the voltage tests for being at full charge, yet be much lower than it's original capacity. If plates are damaged, sulfated, or partially gone from long use, the battery may give the appearance of being fully charged, but in reality acts like a battery of much smaller size.

State of charge, or conversely, the depth of discharge (DOD) can be determined by measuring the voltage. This will NOT tell you how good (capacity in AH) the battery condition is - only a sustained load test can do that. Voltage on a fully charged battery will read 2.12 to 2.15 volts per cell, or 12.7 volts for a 12 volt battery. At 50% the reading will be 2.03 VPC (Volts Per Cell), and at 0% will be 1.75 VPC or less. This can vary with battery types and brands somewhat

Your battery is not toast, but it is an extremely bad performer and will let you down when you least expect it.

At 50% discharged the useful life is about 35 minutes and is probably the reason for you electrical problems.

There is a set out regime for charging new batteries which was probably not followed when the acid was added.

I suggest to take it back for warranty.
 

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2012 Hyundai veloster
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13 Posts
Discussion Starter #12
At 12.1 volts, the battery is less that 50% charged or conversely 50% discharged. The alternator is working fine. The drop while starting is within standard.

A battery can meet the voltage tests for being at full charge, yet be much lower than it's original capacity. If plates are damaged, sulfated, or partially gone from long use, the battery may give the appearance of being fully charged, but in reality acts like a battery of much smaller size.

State of charge, or conversely, the depth of discharge (DOD) can be determined by measuring the voltage. This will NOT tell you how good (capacity in AH) the battery condition is - only a sustained load test can do that. Voltage on a fully charged battery will read 2.12 to 2.15 volts per cell, or 12.7 volts for a 12 volt battery. At 50% the reading will be 2.03 VPC (Volts Per Cell), and at 0% will be 1.75 VPC or less. This can vary with battery types and brands somewhat

Your battery is not toast, but it is an extremely bad performer and will let you down when you least expect it.

At 50% discharged the useful life is about 35 minutes and is probably the reason for you electrical problems.

There is a set out regime for charging new batteries which was probably not followed when the acid was added.

I suggest to take it back for warranty.
If the battery is at 50%, why is it only every once in a while that it experiences these episodes? Plus I have had a completely dead battery before this one. I had to travel with a portable jumper pack and it never did this.
 
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