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Ask -Brad- Your Own Question
-Brad-, Dodge Dealership Tech
Category: Dodge
Satisfied Customers: 8063
Experience:  16 Yrs Chrysler/Dodge Technician. ASE Master Certified(L-1)
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I have a Chrysler 300 Limited with a 3.5L V6. The issue i am

Customer Question

Hi my name is ***** ***** I have a Chrysler 300 Limited with a 3.5L V6. The issue i am having is a C121C ABS code
JA: Thanks. Can you give me any more details about your issue?
Customer: When I drive the car down the road, it will drive fine for about a 1/4 of a mile then it will go into limp mode.
JA: OK got it. Last thing — Dodge Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.
Category: Dodge
Expert:  -Brad- replied 1 year ago.

Good morning and welcome to JustAnswer!!

Can I get the last 8 of your VIN also is the ABS or brake lights on?

Talk soon,


Customer: replied 1 year ago.
Expert:  -Brad- replied 1 year ago.

Thanks for the VIN!!

There is a bulletin that addresses the C121C code and I attached it for you to follow.. If you have the old MAP style I would replace it first to see if it resolves your issues..

I hope this helps, and if you need anymore assistance all you have to do is reply..
And feel free to request me for all your Chrysler-Dodge-Jeep needs.

Have a great day,

Customer: replied 1 year ago.
There are no ABS or brake lights on either. The only 2 lights on are the ESP light and the light with the lightning bolt and they only come on when the vehicle goes into limp mode.
Customer: replied 1 year ago.
The MAP sensor is the old style but when it comes to the TSB shouldn't all of those codes be active.
Expert:  -Brad- replied 1 year ago.

No if any of the codes are setting we start by replacing the old style MAP sensor first... I also attached the diagnostics for C121C as well..

Glad I could help and don't forget to RATE so I'm credited for my time

Have a great day,


Expert:  -Brad- replied 1 year ago.

Are you still here? Do you need more assistance?

Customer: replied 1 year ago.
No Sir, the Map sensor fixed it
Expert:  -Brad- replied 1 year ago.

Glad I could help and don't forget the RATING so I'm credited for my time..

Have a great day,