Red lightning bolt, traction control lights and limp mode, codes C121C, P2173 and P061A

2008 CHRYSLER 300

65,000 MILES • 3.5L • V6 • 2WD • AUTOMATIC

MEMBER
2 POSTS
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I bought my car in December '19 and decided it was time to change the spark plugs. The only issue prior to the change was some hesitation when I initiated acceleration. My neighbor who is familiar with regular auto maintenance assisted me. O'Reilly recommended Champion Double Platinum 7034 and we verified all were gapped at .050 in. When I drove the next day, I was at a stoplight when the lightning bolt and traction control lights pop up then my car went into limp mode. I can temporarily fix the problem by turning it off and then on. There were 3 codes pulled:
C121C
P2173
P061A

Apr 25, 2021 at 7:30 PM

KASEKENNY

CERTIFIED EXPERT
18,907 POSTS

I doubt this is related to the spark plugs so I would suggest starting with the P2173 code. I supplied the testing for all these codes below.

Please run through this material and let us know if you have other questions and what you find. Thanks

Images (Click to enlarge)

Apr 26, 2021 at 8:35 PM

[email protected]

MEMBER
2 POSTS

Thank you! It was weird how it started right after it happened but I'll go through the testing and go from there.

Apr 27, 2021 at 2:43 PM

KASEKENNY

CERTIFIED EXPERT
18,907 POSTS

Totally understand. Unfortunately these coincidences happen frequently. It could be related to the repair if something was left unhooked or damaged but it would not be the plugs themselves.

Please let us know if you have other questions or what you find. Thanks

Apr 27, 2021 at 7:47 PM