IS - 3rd Gen (2014-present) Discussion about the 2014+ model IS models

low battery voltage causes codes

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Old Nov 29, 2019 | 12:21 AM
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Default low battery voltage causes codes

Recently decided to scan my IS350 with the BlueDriver that I have. There were no light on the dashboard and the car had no visible problems with mpg being actually fairly decent...around 20.7mpg (mixed driving).




So, after scanning, it showed me:
1 electronic-controlled power steering code [C1241 - low or high power supply voltage]
3 advanced parking guidance system codes [U0131, U0140, U0163]
1 antilock brake system code [c1241]
4 A/C codes [B1441, B1442, B1454, B1455]
1 telematic code B15C4 - SRS communication error

I suspected that the battery was to blame, unless a ton of stuff just went bad for no reason.
After realizing that in the last 2-3 months it started to get a bit cold, and I at the same time, stopped driving the car too much, I thought that it might just be the battery and the best way to charge it would be just driving it.
So, after giving it about 1 hr continuously, and resetting the codes, I rescanned it again and the BD came up with 0 codes.

Last edited by sunamer; Nov 29, 2019 at 12:27 AM.
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Old Dec 1, 2019 | 12:07 AM
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That's normal for modern cars, since a lot of the systems/components are electronic. They depend on a minimal voltage to work properly and to register as working without issues.
For example if your power steering components started going bad(it can happen) you will notice steering issues/handling issues since the system assumes some worst case scenario and tries to do something about it. This is common on previous Toyota models and you can search about this on Google if you are interested in the current issues on Toyota cars. Another good one is your MAF sensor, if it was going bad it could register low or high voltage and the system assumes a set scenario and runs off of that and one effect would be MPG.
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Old Dec 1, 2019 | 06:19 AM
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Originally Posted by ex00
That's normal for modern cars, since a lot of the systems/components are electronic. They depend on a minimal voltage to work properly and to register as working without issues.
For example if your power steering components started going bad(it can happen) you will notice steering issues/handling issues since the system assumes some worst case scenario and tries to do something about it. This is common on previous Toyota models and you can search about this on Google if you are interested in the current issues on Toyota cars. Another good one is your MAF sensor, if it was going bad it could register low or high voltage and the system assumes a set scenario and runs off of that and one effect would be MPG.
you mean, MAF sensor could set off the same C1241 code?
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Old Dec 1, 2019 | 01:42 PM
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Originally Posted by sunamer
you mean, MAF sensor could set off the same C1241 code?
Not the same code but another code that is similar I would say...
Codes might show up later on as the car sits and stuff. I think it's just normal and it doesn't warrant any alerts for now.
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