2011-2012 Fisker Karma Steering Knuckle: Diagnosing Noises, Failures, and Replacement

Symptoms of a Failing Steering Knuckle

A steering knuckle is a robust component that typically only fails due to a significant impact, like hitting a curb or a deep pothole, or from extreme corrosion. Symptoms of a bad knuckle are often similar to those of other failing suspension parts, so careful diagnosis is key.

Noises and Vibrations

• Clunking or Popping: A common sign is a clunking or popping sound when turning at low speeds, such as in a parking lot. This can indicate that the knuckle is bent, causing other components like ball joints to bind and release under load.
• Squealing or Grinding: Squealing during turns can be caused by a bent knuckle that misaligns the brake rotor with its dust shield or puts stress on the wheel bearing.
• Steering Wheel Vibration: A vibration or shimmy felt in the steering wheel, especially at highway speeds, can be a symptom of a damaged knuckle that has thrown the wheel assembly out of balance.

Steering and Alignment Issues

• Vehicle Pulls to One Side: If the car consistently pulls to the left or right even after a professional wheel alignment, it's a strong indicator that a knuckle is bent. A bent knuckle changes the camber and toe angles in a way that alignment adjustments cannot correct.
• Off-Center Steering Wheel: The steering wheel may be crooked even when driving straight.
• Poor Steering Response: The steering may feel loose, vague, or slow to return to center after a turn.

Visual Signs and Tire Wear

• Uneven Tire Wear: A classic sign of a bad knuckle is rapid or uneven wear on the inner or outer edge of just one front tire. This is caused by the wheel being held at an incorrect angle.
• Visible Damage: In a worst-case scenario, you may be able to see a physical crack or bend in the aluminum knuckle itself. Any visible crack makes the part unsafe and requires immediate replacement.

Known Issues, TSBs, and Recalls for 2011-2012 Fisker Karma

While the Fisker Karma was subject to several recalls, none were related to the steering knuckles or suspension components. Recalls primarily addressed the high-voltage battery cooling system, a low-temperature cooling fan, and Takata airbags.

Service Bulletin for Front Wheel Clicking Noise

The most relevant technical issue for this part of the vehicle is Service Bulletin 254120035.03, issued to address a clicking sound from the front wheels during low-speed turns. As noted earlier, this is not a knuckle failure but a noise that can be misdiagnosed. The official repair involves cleaning the wheel and rotor hub surfaces and replacing all lug nuts with updated, coated versions.

Buying a Used 2011-2012 Fisker Karma Steering Knuckle Assembly

Due to the rarity of the Fisker Karma and the bankruptcy of the original manufacturer, new OEM parts can be extremely difficult to find. Furthermore, there is no significant aftermarket support for this specific component. For these reasons, a quality used OEM steering knuckle is the most practical and often the only available option for repair.

What to Inspect on a Used Knuckle

• Check for Cracks: This is the most important inspection. The Karma's knuckles are cast aluminum. Carefully examine the entire part, especially around the mounting points for the ball joints and tie rod. Any crack, no matter how small, means the part is scrap and unsafe to use.
• Inspect Mounting Holes: Look at the tapered holes where the ball joints and tie rod end mount. Check for any signs of warping, elongation, or damage (sometimes called "wallowing out"). A damaged mounting hole will prevent the new joint from seating correctly and securely.
• Look for Impact Damage: Check for scrapes, gouges, or bends that indicate the donor vehicle was in a collision or hit a major road hazard. A bent knuckle is useless.
• Condition of Bearing Surface: While you will likely press in a new wheel bearing, inspect the bore in the knuckle where the bearing sits. Ensure it is smooth and free of deep scoring or corrosion that could prevent the new bearing from seating properly.

Mileage and Compatibility

Mileage is not a primary concern for a steering knuckle, as it is a solid metal part with no internal moving components. The condition, determined by its history of impacts and corrosion, is far more important. A part from a 50,000-mile car that hit a curb is worse than a part from a 100,000-mile car with no impact history. The successor company, Karma Automotive, continued to use a very similar chassis for the later Revero model, so parts may be compatible. For example, part number C1311222002 is for a front right knuckle on a 2020-2022 Revero and may fit the earlier Fisker Karma. Always verify compatibility with the seller by comparing photos and mounting points.

Cost to Replace a Fisker Karma Steering Knuckle

Costs for a niche luxury vehicle like the Fisker Karma will likely be higher than for a mainstream car. The estimates below are based on general industry pricing and should be adjusted for the Karma's rarity.

Related Parts to Consider Replacing

Replacing a steering knuckle requires disassembling the entire corner of the suspension. This is the ideal time to replace other wear items, as you will not have to pay for the overlapping labor again.

• Wheel Bearing/Hub Assembly: It is highly recommended to press a new wheel bearing into the replacement knuckle before installation.
• Ball Joints: Both the upper and lower ball joints connect to the knuckle. Inspect them for play and replace if worn.
• Tie Rod End: Connects the steering rack to the knuckle. Check for looseness.
• ABS Sensor: These can sometimes be seized in the old knuckle and damaged during removal. It's wise to have a new one on hand.

Frequently Asked Questions (FAQ)