2004 Hyundai Santa Fe P0446 CEL Code - RPMs Drop to Zero at

BRIAN.WOLFE86

MEMBER
2004 HYUNDAI SANTA FE
4 CYL
2WD
AUTOMATIC
96,000 MILES

Hi,

I'm having an issue where about every other time I get on the highway and get my car up to speed (about 70 mph), within the first minute of maintaining that speed, my engine's RPMs drop to zero and the car lurches and begins losing speed. If I pump the accelerator a few times the engine usually comes back, but the time it takes for this to happen is lengthening.

Originally it happened for less than 2 seconds, then it took about 5 seconds, now it's about 10 seconds. This last time it occurred, I tried turning the key to the "Start" position to see if the engine had died and nothing happened.

I can provide any more details necessary on this, but I was wondering if this was sounding more like an electrical issue (battery or alternator), emissions issue (PCV valve, charcoal canister, etc) or something else (crankshaft position sensor).

Any ideas?

Thanks,

Brian

4 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Hi there,

The first check is to get a scan done to check for any unresolved fault codes, do this and report your findings for more assistance.

Mark (mhpautos)

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Tuesday, October 13th, 2009 AT 4:50 PM

BRIAN.WOLFE86

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3 POSTS

Are you talking about the CEL (Check Engine Light) code I referred to in my previous post? Or is there some other code I should be referring to?

Thanks,

Brian

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Tuesday, October 13th, 2009 AT 4:57 PM

MHPAUTOS

MECHANIC
31,937 POSTS

Yes, any check light will indicate a set code has been lodged in the memory of the ECU, you can also have fault code set with out a check light coming on so a scan is always a good place to start any diagnosis.

Mark (mhpautos)

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Tuesday, October 13th, 2009 AT 5:00 PM

BRIAN.WOLFE86

MEMBER
3 POSTS

Thanks for the reply Mark. I think I've got what you asked for (or at least everything that AutoZone would tell me).

The two codes stored in memory are:

P0335 - Crankshaft position sensor circuit malfunction

P0446 - Evaporative emissions control vent circuit low

My guess would be the CKPS over the emissions vent circuit. Could anyone shine some light on whether this is something a weekend mechanic could (or should) do? Or should I just drop the $500 for a shop to fix it? (Got two quotes at around that price)

Thanks,

Brian

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Wednesday, October 14th, 2009 AT 8:38 AM