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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
Brand new to this forum as i'm usually on the ones for the vehicles with the little blue oval on the front.
The wife bought a 2014 JK about a year ago and hasnt been treating me nicely lol. Had to pull the valve covers and replace the rockers at 75k miles as one was going out. Wheel speed sensors, and various other small things.
The one that I'm struggling with now is this C121a Steering angle sensor not initialized. I've read a broken clock spring can cause this. I have no scanner that can read this and was debating getting Jscan as i know it can read the sensors live data, does anybody know if you can reinitialize the sensor with that software assuming its not broken?
Couple days late here, but this is all the service manual has for that code -
I know Jscan can read the steering angle sensor, but i am not sure about any re-intitialization of it. Replacing clocksprings on these JKs is a pretty common thing. I could tell you that I replaced with a Crown unit years ago at a much cheaper price and it's been fine.
I found several variations on the Steering Angle Sensor Initialization Procedure, but they are similar.
Leave the Car Running: Make sure your vehicle is on and running.
Turn the Steering Wheel All the Way to the Left: Rotate your steering wheel fully to the left and hold it in that position.
Turn the Steering Wheel All the Way to the Right: Now, turn your steering wheel fully to the right and hold it there.
Return to the Center Position: Move your steering wheel back to its center position. (some say turn left again, them back to center)
Turn Off the Car: After reaching the center position, turn off your vehicle.
Clear the Fault Code: Finally, clear any fault codes that may have been logged in your vehicle’s system. You'll need to spring (pun intended) for an OBD2 reader and a program like JSCAN.
If the fault comes back it's likely the clockspring. Be aware that there is an airbag in the center of the steering wheel if you decide to DIY.
C121a Code
