PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Can/Should I turn off this SES code...?

Thread Tools
 
Search this Thread
 
Old Dec 13, 2006 | 08:45 PM
  #1  
pdanrichey's Avatar
Thread Starter
TECH Resident
iTrader: (4)
 
Joined: Nov 2004
Posts: 768
Likes: 1
From: Keller, TX
Question Can/Should I turn off this SES code...?

DTC P0704 Clutch Switch Circuit

Can I just delete this code? The SES light kicked on about 2 weeks ago, scanned it and I think it was this code. Well, it just came on again tonight...but everything on my car works and runs just fine. Can I just HP Tuners to just turn this code off? Seriously...what the heck does it do anyways?

I don't have my HP Tuners PC connector with me, but will get it later this week. Thanks!
Reply
Old Dec 14, 2006 | 01:09 PM
  #2  
pdanrichey's Avatar
Thread Starter
TECH Resident
iTrader: (4)
 
Joined: Nov 2004
Posts: 768
Likes: 1
From: Keller, TX
Default

TTT... I'd like to figure this biatch out so I can fix it tonight!
Reply
Old Dec 14, 2006 | 01:12 PM
  #3  
TAQuickness's Avatar
TECH Junkie
iTrader: (28)
 
Joined: Jan 2004
Posts: 3,250
Likes: 1
From: Houston
Default

clutch switch prevents you from starting the vehicle with out depressing the clutch. You can turn it off, but why not replace the switch?
Reply
Old Dec 14, 2006 | 02:33 PM
  #4  
pdanrichey's Avatar
Thread Starter
TECH Resident
iTrader: (4)
 
Joined: Nov 2004
Posts: 768
Likes: 1
From: Keller, TX
Default

I've never been able to start the car without pushing the clutch in anyways. Not to sound like a moron, but I don't even know where the stupid sensor is... I'm wondering though if that's the reason why my cruise control just stopped working out of the blue?? Fuses are all intact.
Reply
Old Dec 15, 2006 | 01:23 PM
  #5  
2002_Z28_Six_Speed's Avatar
TECH Veteran
iTrader: (19)
 
Joined: Aug 2005
Posts: 4,538
Likes: 1
From: Wash, DC
Default

Well if you turn off a code does it disable the function? I thought if you turned it off it would only not trigger the MIL while the functionality would still be there.
Reply
Old Dec 15, 2006 | 01:48 PM
  #6  
LilSlo1's Avatar
10 Second Club
iTrader: (3)
 
Joined: Aug 2006
Posts: 305
Likes: 1
From: Plainfield, Illinois
Default

You need HP tuners or LS1 edit, to "turn off" turn off the sensor. You would set the sensor/code to "no errors reported". That does not turn the sensor off, but if the sensor fails or is bad, it will not throw a code or turn on the check engine light.

Honestly, you should just replace it, its actaully a good safety device (so you don't try to start the car in gear with the clutch pedal released. That sensor is probably why your cruise doesn't work. I think the cruise is designed to turn off when the clutch pedal is pressed. I know on a third gen f-body the sensor, or button in under the dash by the clutch pedal.
Reply
Old Dec 15, 2006 | 01:55 PM
  #7  
2002_Z28_Six_Speed's Avatar
TECH Veteran
iTrader: (19)
 
Joined: Aug 2005
Posts: 4,538
Likes: 1
From: Wash, DC
Default

That is what I meant. If the switch doesn't working and you mask the code the PCM is still reacting to it. Because I wanted to do that with rear O2s but i knew it wouldn't work

The computer is still going to mess with the mixture and ....

Last edited by 2002_Z28_Six_Speed; Dec 15, 2006 at 02:32 PM.
Reply
Old Dec 15, 2006 | 03:16 PM
  #8  
greatwhite99's Avatar
On The Tree
 
Joined: Dec 2001
Posts: 147
Likes: 0
From: New Jersey
Default

The switch is easy enough to get to once you remove the inspection cover from the dash. Mine broke off of one of the mounting things so I just zipped tied it back in place.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-1

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-2

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-3

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-4

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-5

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-6

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-7

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-8

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-9

10 Camaros You Should Never Buy

 
Old Dec 15, 2006 | 03:43 PM
  #9  
2002_Z28_Six_Speed's Avatar
TECH Veteran
iTrader: (19)
 
Joined: Aug 2005
Posts: 4,538
Likes: 1
From: Wash, DC
Default

I actually did the exact same procedure!
Reply
Old Dec 15, 2006 | 03:52 PM
  #10  
LilSlo1's Avatar
10 Second Club
iTrader: (3)
 
Joined: Aug 2006
Posts: 305
Likes: 1
From: Plainfield, Illinois
Default

Originally Posted by 2002_Z28_Six_Speed
That is what I meant. If the switch doesn't working and you mask the code the PCM is still reacting to it. Because I wanted to do that with rear O2s but i knew it wouldn't work

The computer is still going to mess with the mixture and ....
You can do that to your rear O2's. I have mine set to no error reported. Car runs fine. From what I know and heard the rear O2's have nothing to do with mixture.
Reply
Old Dec 15, 2006 | 05:21 PM
  #11  
TAQuickness's Avatar
TECH Junkie
iTrader: (28)
 
Joined: Jan 2004
Posts: 3,250
Likes: 1
From: Houston
Default

You may have problems with DFCO as well if the switch is malfunctioning. I would replace it rather than delete the code.
Reply
Old Dec 15, 2006 | 09:24 PM
  #12  
pdanrichey's Avatar
Thread Starter
TECH Resident
iTrader: (4)
 
Joined: Nov 2004
Posts: 768
Likes: 1
From: Keller, TX
Default

Rear O2's do not affect the car's performance. You can just delete those codes and be just fine.

I have HP Tuners, that's why I'm able to "delete" it. After I went to the track one night, on the way home I noticed that my cruise wasn't working. A couple weeks later, the check engine light came on. I put in the scanner, checked it and up popped this code for the cruise switch.
Within HP Tuners, a few others came up as well, but they said (history) (old) next to them. Does that mean at one point they were there but no longer mean anything for how the car is running now? Even though I clear them, they keep coming up saying (history), etc... Can anyone answer that?

Also, how much does the clutch switch sensor cost and how exactly again can I replace it? Thanks fellas.
Reply
Old Dec 15, 2006 | 09:48 PM
  #13  
LilSlo1's Avatar
10 Second Club
iTrader: (3)
 
Joined: Aug 2006
Posts: 305
Likes: 1
From: Plainfield, Illinois
Default

Originally Posted by pdanrichey

a few others came up as well, but they said (history) (old) next to them. Does that mean at one point they were there but no longer mean anything for how the car is running now? Even though I clear them, they keep coming up saying (history), etc... Can anyone answer that?
What codes where they ?
Reply
Old Dec 15, 2006 | 09:58 PM
  #14  
pdanrichey's Avatar
Thread Starter
TECH Resident
iTrader: (4)
 
Joined: Nov 2004
Posts: 768
Likes: 1
From: Keller, TX
Default

Off the top of my head...?

I think they date back to a year ago when my bro in law unplugged a front O2 instead of the rear and simulated the front one. The car ran like crap...flashing SES lights at me. Of course I just told it to shut up, I slammed my laptop lid closed and hit my 8th stage of NOS. Then, the floorboard on my passenger side unbolted itself and fell off. Sparks flew all over the place, almost got me right in the eye! It was a close call!

Seriously though, I think they were like...bank 2 lean...can't switch, etc.
Reply
Old Dec 16, 2006 | 01:29 PM
  #15  
wait4me's Avatar
TECH Addict
iTrader: (10)
 
Joined: Feb 2003
Posts: 2,961
Likes: 2
From: warsaw, in
Default

That Clutch switch is important, It changes things in the pcm too. It is the only thing that it gets to see that your making a gear change or not.
Reply
Old Dec 16, 2006 | 11:49 PM
  #16  
deejaydaze's Avatar
11 Second Club
iTrader: (11)
 
Joined: Jul 2004
Posts: 491
Likes: 0
From: Orlando, FL
Default

This drove me nuts for months on my girl's SS.

There are 2 switches!

Clutch safety switch is at the bottom of the pedal and black in color. It's about 1" x 2" x 1" switch with a big part of it being the "button". This is the switch that will not let you start the car.....blah ...blah blah. (I'm thinking of replacing mine because my car sometimes won't start and I have a hunch.)

The other switch is at the top of the pedal and it's white in color. Look WAY up there. I want to say its cylinder shaped. It has a tiny moving part that is spring loaded and pin shaped. It comes out about 5/8 of an inch or so. The pin faces the pedal so that when the pedal is up ALL THE WAY the pin is in. As soon as you push the pedal down and start to engage the clutch the pin comes out. This switch is a threaded adjustable type. If its not fitted correctly your PCM thinks that the clutch pedal is on the way down to the floor. The problem for me was the pedal was up all the way and the pin was still out! To screw the switch closer to the pedal I disconnected the wire harness because I had to turn it about 10 times. The wires would have been seriously tangled if I hadn't done so.

This information is VERY useful and is on this forum some where. I found it when I was troubleshooting and SES light and no cruise control after a master cylinder swap.

This is just my experience.
Reply
Old Dec 17, 2006 | 07:12 AM
  #17  
2002_Z28_Six_Speed's Avatar
TECH Veteran
iTrader: (19)
 
Joined: Aug 2005
Posts: 4,538
Likes: 1
From: Wash, DC
Default

I thought the rear O2 has functionality like the CAT overtemp and protection stuff.
Reply
Old Dec 17, 2006 | 09:44 AM
  #18  
wait4me's Avatar
TECH Addict
iTrader: (10)
 
Joined: Feb 2003
Posts: 2,961
Likes: 2
From: warsaw, in
Default

Yes, you are correct, You never even really need to remove them. Even if you pull of the cats, Usually people just pull them out. Mine are still in my cars to fill the holes.
Reply




All times are GMT -5. The time now is 12:32 PM.

story-0
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-1
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-2
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-3
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-4
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-5
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-6
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-7
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-8
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-9
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE