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Old 02-27-2018, 08:55 AM
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Join Date: May 2017
Location: Western MD
Posts: 54
Traction control light code C123C

So, I have had my jeep lifted for about 5 months and run 35's, with no issues and everything was hunky dory. I have around a 80 mile round trip every day for work. About 2 weeks ago about 35 miles into my morning commute, my traction control light comes on and stays on until I get to work. Once I get back in the jeep at the end of the day, no light. Drive home no light. Next day same light, light on in morning, no light in the afternoon. this happens every morning ( different mileage intervals for the light) . Finally I got my flashcal yesterday and read my code,


When Monitored:
With vehicle speed above 11 km/h (7 mph), but not if the sensor signal is invalid.

Or, during skidding.

Or, when driving in reverse.

Set Condition:
If the Anti-Lock Brakes Module detects implausible Dynamics Sensor values.

Possible Causes




Anyone ever dealt with a problem like this? I was thinking wheel speed sensor at first but now I see this. I have looked all over the forum and my search brings up nothing.

Thanks in advance for any help/ guidance.

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Old 03-03-2018, 10:28 AM   #2
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Join Date: Jun 2014
Location: orl FL/chincoteague VA
Posts: 371
Mine did this yesterday, light on all day, then off in the evening, I was thinking sensor, cause both my lights come on when its very wet outside, but this was just the T/C light, strange,

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Old 04-25-2018, 10:24 AM
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Location: Western MD
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Anyone else ever see this problem?
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Old 04-29-2018, 08:44 AM   #4
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Location: Georgetown, Texas
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Ny light came on yesterday with 7 codes, this being one of them. Trying to figure out what the issues are.
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Old 12-07-2019, 01:21 PM   #5
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I've gotten this code twice in the last 5 days. Today it happened when I "abruptly" changed lanes. I'm still Googling. I'll post if anything turns up. Code did clear with my OBD II reader.
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Old 12-09-2019, 09:11 AM   #6
Join Date: Jan 2019
Location: Round Rock, TX
Posts: 425
I looked this code up in the factory service manual and there isn't a lot of info that isn't in the first post of this thread. The dynamic sensor contains a yaw sensor and a lateral sensor. The sensor has 4 wires, power, ground and 2 data lines. Short of checking for power and ground, there isn't a lot you can check. The sensor sends data packets to the ABS module. This is why in their troubleshooting (post 1 of this thread), you check the wires for continuity and then you replace the sensor.

It did note that when you put a new sensor in, torquing the bolts to spec is very important otherwise the sensor won't work right.

At some point, I am going to plug a scan tool in to my '14 and see if there are any data pids in the ABS related to the dynamic sensor. Might be helpful to see what the sensor is saying and if it's reasonable. For example, will it say the Jeep is full yaw left while going straight. I'd imagine that the code is related to something like that.

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