Check Engine, TRAC, AND/OR VSC On? Read Me!
- Thread starter BlackWorksInc
- Start date
4thTRDRunner
Junior Member
Dreaded head gasket leak
A few days ago all of these lights came on at the same time. I was hopeful it was something simple or at least cheap, such as a new sensor. Codes being read for the light are P0306 and C1201. Haven't confirmed it is a head gasket leak yet, but it isn't overheating or driving rough so I'm staying hopeful. Appreciate the information on this, I've only had my 4Runner for around a month and I was unsure what VSC and VSC Trac actually meant.
A few days ago all of these lights came on at the same time. I was hopeful it was something simple or at least cheap, such as a new sensor. Codes being read for the light are P0306 and C1201. Haven't confirmed it is a head gasket leak yet, but it isn't overheating or driving rough so I'm staying hopeful. Appreciate the information on this, I've only had my 4Runner for around a month and I was unsure what VSC and VSC Trac actually meant.
So I've had the check engine light, the VSC OFF and the VSC TRAC lights on for a week or two now. I took it to an autoparts store and it pulled the code p0430 which it says is the catalyst efficiency below normal in bank 2. What can I do to fix this problem? is it worth taking to a dealer?
Sisente
Member
Amazon Denso, knockoffs or just bad luck?
I have an 03, v6. I’ve purchased 3 O2 sensors from Amazon. 2x 234-4805 purchased in 2016 and again in 2017, and 1x 234-4804 purchased in 2016. I am now with yet another 4805 sensor code. This will be the third amazon purchased denso 4805. Anyone else have this issue with amazon sensors?
I have an 03, v6. I’ve purchased 3 O2 sensors from Amazon. 2x 234-4805 purchased in 2016 and again in 2017, and 1x 234-4804 purchased in 2016. I am now with yet another 4805 sensor code. This will be the third amazon purchased denso 4805. Anyone else have this issue with amazon sensors?
Sisente
Member
Amazon Denso, knockoffs or just bad luck?
I have an 03, v6. I’ve purchased 3 O2 sensors from Amazon. 2x 234-4805 purchased in 2016 and again in 2017, and 1x 234-4804 purchased in 2016. I am now with yet another 4805 sensor code. This will be the third amazon purchased denso 4805. Anyone else have this issue with amazon sensors?
I have an 03, v6. I’ve purchased 3 O2 sensors from Amazon. 2x 234-4805 purchased in 2016 and again in 2017, and 1x 234-4804 purchased in 2016. I am now with yet another 4805 sensor code. This will be the third amazon purchased denso 4805. Anyone else have this issue with amazon sensors?
dareames
New member
Thought it was the gas cap...
I have a 2006 4Runner SR5 V-6. I have the CEL, VSC TRAC and Traction control lights on. Last time this happened, it was the gas cap. Even though the gas cap was not tightening properly, it isn't the issue as I have replaced the gas cap and have driven it about 1000 miles and the lights haven't gone out.
The codes that are being reported are P0441, P0455 and C1201. Anybody have a clue? I've got an appointment with the dealer for this Friday, but if it's something I can fix myself, I'd rather. Thanks!
I have a 2006 4Runner SR5 V-6. I have the CEL, VSC TRAC and Traction control lights on. Last time this happened, it was the gas cap. Even though the gas cap was not tightening properly, it isn't the issue as I have replaced the gas cap and have driven it about 1000 miles and the lights haven't gone out.
The codes that are being reported are P0441, P0455 and C1201. Anybody have a clue? I've got an appointment with the dealer for this Friday, but if it's something I can fix myself, I'd rather. Thanks!
Shiftless Joe
Member
Toyota Part No.: 84340-69025
SWITCH ASSY, STOP LAMP
Solved a similar issue for me, but my lights would go off once in a while.
Trail edition 5th gen
My 4WD indicator light and crawl control feature lights constantly stay blinking of and on of and on, also, am not able to use crawl control features such as locking rear diff, multi terrain, etc.. . Unplug battery, reconnect, still there. ABS wires replaced, still there, performed yaw control 0 point calibration, still there. Any ideas on what to do next?
My 4WD indicator light and crawl control feature lights constantly stay blinking of and on of and on, also, am not able to use crawl control features such as locking rear diff, multi terrain, etc.. . Unplug battery, reconnect, still there. ABS wires replaced, still there, performed yaw control 0 point calibration, still there. Any ideas on what to do next?
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AuSeeker
Elite Member
Mike, this is the 4th Gen forum and you have a 5th Gen, you may have better luck with your issue if you post in the 5th Gen forum.
That being said I would go to your local auto parts store and see if they can use their OBD 2 code reader to see what trouble codes you have to start fidning out what the issue is with your light being on.
On my 2006 I had VSC and TRAC lights but no check engine. Turned out to be my ODBII itself. I was using a Bluetooth plug-in and torque pro to log while driving. Apparently the computer didn't like that, but after I unplugged it the lights went out and haven't come back on.
Sent from my SM-T280 using Tapatalk
Sent from my SM-T280 using Tapatalk
I see, honestly don’t think so, every one on fifth gens finds their solution through the above methods I’ve tried. Also, I have different lights on then them so it’s leading me to believe it’s an entirely separate issue. Just those 2 green flashing lights. (Crawl control/multi terrain) + (4WD icon) with no codes being thrown at the local auto store
Bluesky 07
Senior Member
Thanks to BlackWorksInc for this outstanding writeup, which enabled me to quickly diagnose and remedy my issue. I was lucky, I hadn't quite gotten the gas cap tightened up after adding some fuel treatment. Cleared the code and checked over 5 hours later, good to go.
Greatly appreciate all the people who contribute knowledge, experience, and wisdom to the forum.
Greatly appreciate all the people who contribute knowledge, experience, and wisdom to the forum.
I read more of this thread to learn what of “loose” (or tired) gas cap gaskets... ...and it seem exhausted! So we’re off to O’Reilly’s tonight. I still welcome any ideas from the more experienced members
Thanks for an awesome info base. Tony
Bigshankhank
New member
My recent experience with this group of dash lights;
Code read as a dirty MAF sensor, I have cleaned it repeatedly to no avail and even replaced it. No affect. One day the brake warning light came on, and had been noticing a potential rear wheel bearing issue. I confirmed the passenger rear bearing was going bad, and noticed that the wheel speed sensor was covered in gear oil. Replaced the bearing and the sensor and sure enough the dash is clear once again.
Code read as a dirty MAF sensor, I have cleaned it repeatedly to no avail and even replaced it. No affect. One day the brake warning light came on, and had been noticing a potential rear wheel bearing issue. I confirmed the passenger rear bearing was going bad, and noticed that the wheel speed sensor was covered in gear oil. Replaced the bearing and the sensor and sure enough the dash is clear once again.
Check, VSC and TRAC lights on, the latter blinking.
Scan reveals P0031 and C1201 (in the ABS computer).
Both auto parts stores that read this said bad 02 sensor.
What say ye?
Thanks.
Edited to add: Just re-read original post to see that the C1201 code is just piggybacking on the P0031. Guess I'll just replace that O2 sensor, and hope that clears both.
Scan reveals P0031 and C1201 (in the ABS computer).
Both auto parts stores that read this said bad 02 sensor.
What say ye?
Thanks.
Edited to add: Just re-read original post to see that the C1201 code is just piggybacking on the P0031. Guess I'll just replace that O2 sensor, and hope that clears both.
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Arcturus08
New member
+1 for the stoplight switch.
Recently had the VSC, ABS, and TRAC lights coming on and off. Replaced the stoplight switch with an OEM replacement and the lights have not came back.
Recently had the VSC, ABS, and TRAC lights coming on and off. Replaced the stoplight switch with an OEM replacement and the lights have not came back.
frankthetank820
New member
C1203 Code.
First time posting here so sorry if I'm in the wrong location as I know this is an old post and I cannot create a new post.
My 2006 V6 4Runner is throwing a C1203 code, so I took the vehicle to the dealership and they said it was a bad ECM. Instead of paying over $1000 for them to install I went online and bought a used ECM that I replaced myself and took to the dealership to re-program. After completing the re-program, the C1203 code remained in the system even though the guy said the replaced ECM was working properly. Now they want me to take the vehicle back in for further diagnosis and spend $130 an hour on something I've already thrown alot of money at. Any chance that anybody knows a solution? I tried clearing the code, disconnecting battery for several hours etc.. but nothing has worked. THANKS!
First time posting here so sorry if I'm in the wrong location as I know this is an old post and I cannot create a new post.
My 2006 V6 4Runner is throwing a C1203 code, so I took the vehicle to the dealership and they said it was a bad ECM. Instead of paying over $1000 for them to install I went online and bought a used ECM that I replaced myself and took to the dealership to re-program. After completing the re-program, the C1203 code remained in the system even though the guy said the replaced ECM was working properly. Now they want me to take the vehicle back in for further diagnosis and spend $130 an hour on something I've already thrown alot of money at. Any chance that anybody knows a solution? I tried clearing the code, disconnecting battery for several hours etc.. but nothing has worked. THANKS!
Abs pump running too often?
One of the first issues I encountered after purchasing my 2003 sport v6 was failure of my ABS motor.
I was able to replace it with a remanufactured part, but I noticed that the brake pump would kick on or cycle every other push of the brakes. General consensus from dealers and technicians is that this is normal.
I plan to post pictures soon.. however please take a look at the air box diagram undermeath the hood of your rig. Located at the back of the airbox filter is a small vaccum hose labeled "pressure regulator"
While completing the hcf delete mod, I noticed that the
Plastic nipple for this regulator was caked completely shut. No vaccum pressure was making its way through this hose.
I tried to push a paperclip through the gunk and ended up busting the plastic hose filing off of the airbox.
I drilled a new hole and screwed in a metal hose filing to replace it.
When i started the rig the abs pump pressurized and maintained pressure even after i pumped the brakes a few dozen times. No longer is the abs motor kicking on every other stop and the brakes are much more stiff.
Im calling it a win.
One of the first issues I encountered after purchasing my 2003 sport v6 was failure of my ABS motor.
I was able to replace it with a remanufactured part, but I noticed that the brake pump would kick on or cycle every other push of the brakes. General consensus from dealers and technicians is that this is normal.
I plan to post pictures soon.. however please take a look at the air box diagram undermeath the hood of your rig. Located at the back of the airbox filter is a small vaccum hose labeled "pressure regulator"
While completing the hcf delete mod, I noticed that the
Plastic nipple for this regulator was caked completely shut. No vaccum pressure was making its way through this hose.
I tried to push a paperclip through the gunk and ended up busting the plastic hose filing off of the airbox.
I drilled a new hole and screwed in a metal hose filing to replace it.
When i started the rig the abs pump pressurized and maintained pressure even after i pumped the brakes a few dozen times. No longer is the abs motor kicking on every other stop and the brakes are much more stiff.
Im calling it a win.
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