Code P0504 - Hyundai Forums : Hyundai Forum
 
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#1 Old 02-14-2010, 10:57 AM
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jimbonj
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Was driving on the highway yesterday and the ESC OFF light came on. When I got home I pulled code P0504 from my OBD2 reader but I don't see P0504 in my manual and a search of P0504 didn't have anything useful.

My manual shows:
P0503 - Vehicle Speed Sensor Intermittent/Erratic/High
P0505 - Idle control System Malfunction

She drives fine and I wonder how serious the P0504 code is and should I get to the dealer ASAP ?

Thanks in advance for any help.

Jim.
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#2 Old 02-14-2010, 11:47 AM
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You have two brake switches. One is a normally open switch, the other normally closed. They cross-check each other.

Hyundai's info for P0504:

The Stop lamp switch is used to judge whether the acceleration system is abnormal or not. The stop lamp switch has a duplex system(signals brake test or brake light) to memorize the abnormality when the signals of depressing and releasing the brake pedal are detected simultaneously.

Checking output signals from both brake switch. When all of them are ON or OFF simultaneously, if abnormal signal is detected for more than 0.5 sec., an error is recognized. And if this condition lasts for certain period, PCM sets P0504. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

The '07 models had some issues with brake switches. Yours could just be another of those. Ask your dealer about TSB# 09-01-018. Should be caught by any dealer if you take it in for service for any other reason. This will be done on their nickel.

"IMPORTANT: DEALERS MUST PERFORM THIS CAMPAIGN ON ALL AFFECTED
VEHICLES WHENEVER AN AFFECTED VEHICLE IS IN THE SHOP
FOR ANY MAINTENANCE OR REPAIR."
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#3 Old 02-14-2010, 01:40 PM
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jimbonj
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QUOTE (canderson @ Feb 14 2010, 11:47 AM)
Quote:
You have two brake switches. One is a normally open switch, the other normally closed. They cross-check each other.

Hyundai's info for P0504:

The Stop lamp switch is used to judge whether the acceleration system is abnormal or not. The stop lamp switch has a duplex system(signals brake test or brake light) to memorize the abnormality when the signals of depressing and releasing the brake pedal are detected simultaneously.

Checking output signals from both brake switch. When all of them are ON or OFF simultaneously, if abnormal signal is detected for more than 0.5 sec., an error is recognized. And if this condition lasts for certain period, PCM sets P0504. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

The '07 models had some issues with brake switches. Yours could just be another of those. Ask your dealer about TSB# 09-01-018. Should be caught by any dealer if you take it in for service for any other reason. This will be done on their nickel.

"IMPORTANT: DEALERS MUST PERFORM THIS CAMPAIGN ON ALL AFFECTED
VEHICLES WHENEVER AN AFFECTED VEHICLE IS IN THE SHOP
FOR ANY MAINTENANCE OR REPAIR."
Thanks for the quick response. I went to hmaservice but couldn't find TSB 09-01-018. I found a recall for the 2007 Santa Fe (Hyundai recall # 092) which deals with the stop lamp switch but my dealer told my VIN was not subject to that recall. I'll be visiting the dealer shortly and would like to be able to point them to the TSB if possible.

Jim.
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#4 Old 02-14-2010, 02:58 PM
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Hate to point you to a different forum, but here you can make yourself a hardcopy of the PDF of the letter owners should have received:

http://www.myhyundaiforums.com/09-01-018.pdf
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#5 Old 02-14-2010, 03:02 PM
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Also, since you said you could get to hmaservice.com (I didn't spot the TSB there either, but...) you can find all of the codes in the [b]DTC section, including P0504. The switches are evidently monitored by the ECU for this error, so head for Engine > Engine Control to find this one. It's called "Brake Switch A/B Correlation".
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