2007 IS350 Code C1203
Thread Starter
Driver School Candidate
Joined: Mar 2017
Posts: 2
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From: FL
2007 IS350 Code C1203
Hi,
I have a 2007 IS 350 with 122,000 miles. the VSC, ABS warning light have coming on. In the past I just open and closed the gas cap and the light went off. So I went an bought a new gas cap. That worked for three weeks. The lights have come on again and the little trick hasn't worked. Brought it to a mechanic and Code C1203 came up; Electronic Control Module Communications Circuit Malfunction. Has this happen to anyone else? This sounds like an expensive fix. The car is running great.
I have a 2007 IS 350 with 122,000 miles. the VSC, ABS warning light have coming on. In the past I just open and closed the gas cap and the light went off. So I went an bought a new gas cap. That worked for three weeks. The lights have come on again and the little trick hasn't worked. Brought it to a mechanic and Code C1203 came up; Electronic Control Module Communications Circuit Malfunction. Has this happen to anyone else? This sounds like an expensive fix. The car is running great.
Lead Lap
Joined: Sep 2016
Posts: 418
Likes: 66
From: Texas
This isn't for a IS 350 but it is for a Toyota so it stands to reason that it is representative of the problem you are having.
http://share.qclt.com/%E4%B8%B0%E7%9...em/0370017.pdf
Anyway, you look at it, it will be expensive to fix. Worst case a new ECM for c1203.
http://share.qclt.com/%E4%B8%B0%E7%9...em/0370017.pdf
Anyway, you look at it, it will be expensive to fix. Worst case a new ECM for c1203.
Driver School Candidate
Joined: Jun 2021
Posts: 1
Likes: 0
From: CA
I know it's been a few years, but just thought I'd mention since this post shows up when Googling these exact keywords. On my 2015 IS250 I also got the "Check ABS" warning and the "VCS Off" symbol as well as ABS Code C1203 DTC - ECM Communication Circuit. This was after changing all brake pads and rotors while having the car fully on jack stands. We think this happened because I messed with the transmission shifts while wheels were off ground. Which is something you should never do with cars like these, and my bonehead self found the hard way.
None of the DIY Zero Point Calibration tricks on Youtube worked for me, maybe I did them wrong or the ones I found weren't meant for this car. I took it to my local Mechanic who was able to calibrate with his Snap-On scan tool easy within 20 minutes, of course that didn't come free lol!
None of the DIY Zero Point Calibration tricks on Youtube worked for me, maybe I did them wrong or the ones I found weren't meant for this car. I took it to my local Mechanic who was able to calibrate with his Snap-On scan tool easy within 20 minutes, of course that didn't come free lol!
I know it's been a few years, but just thought I'd mention since this post shows up when Googling these exact keywords. On my 2015 IS250 I also got the "Check ABS" warning and the "VCS Off" symbol as well as ABS Code C1203 DTC - ECM Communication Circuit. This was after changing all brake pads and rotors while having the car fully on jack stands. We think this happened because I messed with the transmission shifts while wheels were off ground. Which is something you should never do with cars like these, and my bonehead self found the hard way.
None of the DIY Zero Point Calibration tricks on Youtube worked for me, maybe I did them wrong or the ones I found weren't meant for this car. I took it to my local Mechanic who was able to calibrate with his Snap-On scan tool easy within 20 minutes, of course that didn't come free lol!
None of the DIY Zero Point Calibration tricks on Youtube worked for me, maybe I did them wrong or the ones I found weren't meant for this car. I took it to my local Mechanic who was able to calibrate with his Snap-On scan tool easy within 20 minutes, of course that didn't come free lol!
https://www.clublexus.com/forums/is-...l#post10248684
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