C42 error code - Suzuki SV650 Forum: SV650, SV1000, Gladius Forums

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SV1000 (03-07) Tech Info, advice or questions specific to 2003-2007 model SV1000. Sponsored By: Werks Parts

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Old 05-10-2011, 11:13 AM   #1
Join Date: Nov 2010
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Miles Kms: 10K
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C42 error code

My bike hasn't been starting correctly lately, fuel pump Wont prime. And it has gotten to the point where it doesn't start until 15-20 attempts wiggling the key around. I've narrowed it down to a c42 error, which seems to be a recurring issue on the site. But I have yet to find a proper answer on how to fix this. I really don't want to swap the ignition, is there any recommendations from anyone out there on how to fix this?
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Old 05-10-2011, 05:16 PM   #2
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Re: C42 error code

C42 is the anti-theft resistor in the Key-Switch assembly

What you can do is remove the orange/red from the key-switch and connect it via 100 ohm resistor to the orange wire. You can pick up a 100ohm resistor at RadioShack.
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Old 10-22-2011, 03:47 PM   #3
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Re: C42 error code

Hey D , I don't have a red/orange wire comming from the key switch on my sv1k . I have two red, one orange, one orange/yellow, and brown wire. Which wires do I connect with the 100 ohm resistor?
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Old 01-11-2012, 10:00 AM   #4
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Re: C42 error code

Ok I figured it out buddy... Red wire (from switch) attached to orange/yellow(in line via 100 ohm resistor)

Took a while, and I panicked a little when I didn't see a orange/red wire

Thanx man
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Old 01-11-2012, 06:38 PM   #5
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Re: C42 error code

I have had to get custom keys made because idiotically i lost my original key, and these keys thats were made for me from a locksmith work good, but could these be the culprit?

edit: im getting an error that seems to be just like this, and i have custom keys to boot. i dont want to take the anti-theft OUT of the bike, but should i look into either getting better cut keys or ?

Last edited by Exhausted; 01-11-2012 at 07:10 PM.
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Old 12-28-2014, 07:01 PM   #6
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Hi guys, I'm new here as you are my last possible solution. My SV650 let me down on boxing day while i was going home. After I finish shopping I stopped by my friend. When i left my friend's house, I start my SV650, I let it warm up for 5 minutes as every time then i get on it and tried to go home, a mile away from my friends house the engine suddently cut off. I pulled over and i switched the key off and on, the fuel pump sound was coming on as it should but when i press the start button it wouldn't do nothing, i tried push starting it I couldn't as i was by myself and it was cold outside. I managed to get it home and today in the morning i start to remove the panels and have a look around. I checked the fuses, they allright, the kill switch, stand switch and clutch switch are allright as the pump is coming on when i test it. Then the same problem i couldn't see why it doesn't react when i pressed the start button. Anyway, I needed a break as I was too angry so i got a cup if tee and warm up for about an hour. When i got back to the bike i put the key in, turn the ignition on, the fuel pump won't come in anymore, F1 on display, i put it into dealer mode to find out the Fault Code which it was -C42 and that is quite all so far, I read some threads about this, honestly i Can't understand nothing what is out there I need a quick solution cuz i really need to ride my bike. Please tell me how to fix it, as clear as possible. Suzuki SV650 K5, Fully Faired, 2005, had it for 1 and half month, Fully Serviced 3 weeks ago (K&N Filters, EBC Brake Pads, Castrol Brake Fluid, Castrol Performance Fully Synthetic oil, -30 to +140 Degrees coolant, NGK Iridium Spark Plugs). THE BATTERY IS FULLY CHAARGED.

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Old 12-28-2014, 10:37 PM   #7
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Re: C42 error code

Welcome to the Forum.

Firstly...you're in the 1K section so others with 650's might not see this...but no matter, you're here and I think we can help. The C42 says the ECU isn't seeing the correct voltage coming from the Anti-Theft resistor in the ignition cylinder. This can be caused by several things including bad connections or a worn/dirty ignition switch.

Best to check all the connections you can on the battery and starter solenoid just to make sure nothing has come loose. If all are OK, try jumping across the starter solenoid to see that the starter spins...be SURE it's in Neutral!!! If the starter runs then you can rest easy that it's good and also the wiring from the solenoid to it is sound.

The ECU setting the C42 doesn't necessarily mean the ignition switch is bad as anything robbing the rest of the bike of voltage could trip this code, but making sure the switch is clean inside a good thing to look at having this problem. The connector at the end of the ignition switch is the infamous Green Connector that tends to burn up on the 1K's...but I'm not sure if the 650's suffer the same fate. You can check the switch function easily when checking the GC so it's not a wasted effort to get to it for a check.

Unfortunately, you're probably hoping for a 'change the XXX' to fix the bike....and that's unlikely to happen. We know what it's doing (or not doing) but some things need to be checked to help figure out what is causing the problem. Double check what I mentioned above and if you don't find the problem at least we'll have a better idea where to go next. Don't worry....you can fix this!!
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Old 12-29-2014, 10:02 AM   #8
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Re: C42 error code

One thing you can do is cycle the kill switch on/off till you hear the fuel pump kick on. Easier than toggling the ignition switch back and forth and seems to work better.

I lived with this same problem for years on my DL, didn't realize it was this easy to install the resistor! But, it never left me stranded because of it.
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