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Chrysler 300 (2012-2017) Suspension Torque Specs and Diagnostic Overview is a working reference for owners, technicians, and buyers comparing replacement parts. It covers what to check before purchase, which symptoms matter, and how to plan an installation that does not lean on guesses about year, trim, or drivetrain.

Everything below traces back to the published reference for this platform: three front torque ranges, a rear-torque warning, four ESC and traction-control codes, and a buying checklist. Where the data gives a range, you get the range. Where it points to a factory service manual, so does this article.

The layout, and the numbers you came for

For 2012-2017 Chrysler 300 models, the front suspension uses MacPherson struts and the rear uses a multi-link design. That split matters here because the published torque values concentrate up front, while the rear values shift with trim and drivetrain.

Three front fastener groups carry ranges in the reference data:

• Front strut-to-knuckle pinch bolts — around 85-95 lb-ft.
• Upper strut rod nuts — usually 20-30 lb-ft.
• Sway-bar link nuts — around 45-55 lb-ft.

Those ranges are wide because hardware changed across the run. Land on the exact value your factory service manual lists for your vehicle before the wrench turns.

The four codes, and what actually trips them

Four diagnostic trouble codes belong to the ESC and traction-control side of this platform: C1201, C1202, C121A, and U0121. The reference lists three triggers: a misaligned steering angle sensor, a faulty wheel-speed sensor, and loose suspension components.

Read that list twice. Not every code means a dead sensor, and not every code means a bent part. Loose suspension hardware alone can set one off — one reason the torque ranges above deserve respect.

When the rear wheel-speed signal is the suspect

A faulty wheel-speed sensor sits on the trigger list, and that sensor lives at the hub. If the rear of the car is already apart, it is the moment to check hub condition. For non-ABS Chrysler 300, Dodge Charger, and Magnum applications, KOEEP carries a rear wheel hub bearing assembly built for the non-ABS configuration, so the sensor fault and the hub check can share one order.

What to verify before ordering

Start with the vehicle year, make, model, engine or drivetrain, and the original equipment number printed on the removed part. Match connector shape, mounting points, dimensions, and left or right position where applicable. A similar-looking component can still be incompatible, so read the seller's fitment notes and hold the original part next to the new one before installation.

• Record the VIN and exact trim level.
• Compare the OE or interchange number and connector layout.
• Check whether the part is front or rear, left or right, or a complete set.
• Inspect nearby components that could cause the same symptom.

Trim and drivetrain change more than ride height. They move rear fastener torque, which is the reason this guide gives no fixed rear figure. Order against the VIN and the OE number, not the trunk badge.

One corner, or the whole assembly?

If the car is a 2012-2019 Chrysler 300 or Dodge Charger with AWD, KOEEP's Front (2) Complete Struts Assembly covers that range as a matched pair — one line item instead of a strut, spring, seat, and mount ordered separately. It also lines up with the inspection rule in the reference data: when struts are replaced, the spring seats get inspected.

Swapping only the worn piece works too. The verification list above applies either way, and the OE number on the removed part stays the final word.

Servicing an earlier 300 as well?

KOEEP's catalog also reaches back to the 2005-2010 RWD generation with a 2x Lower Ball Joint + 4x Inner Outer Tie Rod End kit for that chassis. Different years, same discipline: the OE number decides, and the fitment notes get read before the box opens.

Installation and diagnostic checklist

Disconnect power when the procedure requires it. Support the vehicle correctly. Follow the workshop manual for torque values and calibration steps — a misaligned steering angle sensor is a listed trigger for the codes above, so those steps are not optional bookkeeping.

• Disconnect power where the procedure calls for it.
• Support the vehicle correctly before anything comes loose.
• Follow the workshop manual for torque values and calibration steps.
• Clean mating surfaces before assembly.
• Route wiring away from heat and moving parts.
• Test the repair before the vehicle returns to service.

If a warning light remains on after the work, scan the relevant codes and verify the repair. Recheck power, grounds, fasteners, alignment, and the codes themselves, then compare the installed part with the removed one before buying anything else.

How to choose the right replacement

Prioritize verified compatibility, material quality, warranty coverage, and clear product photos. For safety-critical systems — brakes, steering, sensors, and fuel delivery — use the vehicle-specific specification rather than a universal substitute.

For the broader picture before you commit to a parts list, KOEEP's suspension system comparison guide breaks down the different designs and what each means for the way you drive — useful context for MacPherson and multi-link layouts alike.

When it is time to browse, the KOEEP steering and suspension collection gathers struts, links, joints, and hub assemblies in one place, so fitment notes can be compared side by side instead of listing by listing.

More from the KOEEP blog

Two references travel well with this guide.

• Suspension Strut Torque Specs & Diagnostic Tips for 2005–2009 GM Minivans — the same fastener-by-fastener approach on a different chassis.
• 41610-1R100 Master Cylinder Clutch: 2026 Technical Review for Hyundai Accent (2012–2017) & Kia Rio (2012–2018) — how one OE number anchors the whole fitment decision.

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