2010-2016 SRX & 2011 9-4X Rear Coil Spring Guide: FE2 vs FE3 and the Toe Link Recall

Symptoms of a Bad Coil Spring

A broken or worn-out coil spring will make itself known through several distinct symptoms. Because the spring's main job is to support the vehicle's weight, failure often results in obvious changes to ride height and handling.

• Vehicle Sagging: The most common sign is a noticeable drop in ride height at one rear corner. The vehicle will look uneven or slanted when viewed from the back.
• Clunking or Rattling Noises: A sharp 'clunk' or a continuous rattling sound, especially when driving over bumps, often indicates a broken piece of the spring is loose in the suspension.
• Poor Handling: With a failed spring, the vehicle may feel unstable, lean excessively in turns, or bounce more than usual. This compromises control and can be dangerous.
• Bottoming Out: If the suspension compresses fully and hits the bump stops or the undercarriage strikes the ground over bumps, the spring is no longer providing adequate support.
• Uneven Tire Wear: A collapsed spring changes the suspension geometry, putting uneven pressure on the tire and causing accelerated wear on the inside or outside edge.

Crucial Safety Warning: Check the Rear Toe Link Recall First

Before you conclude your coil springs are bad, you MUST check the status of a critical safety recall. GM issued a recall for the rear suspension toe links on all 2010-2016 Cadillac SRX and 2011-2012 Saab 9-4X models (NHTSA Campaign Number: 21V473000, GM Recall Number: N212340980).

The problem is that an adjustable toe link in the rear suspension can loosen or separate. The symptoms of a failed toe link are nearly identical to a bad coil spring: swaying or wandering at highway speeds, loud metallic noises from the rear, and uneven rear tire wear. A separated toe link can cause a sudden loss of vehicle control, increasing the risk of a crash.

What to do: Contact a GM dealer with your Vehicle Identification Number (VIN) to see if the recall work has been performed on your vehicle. A dealer will inspect and replace the part free of charge if it's covered under the recall. Diagnosing this issue first can save you from unnecessarily replacing the coil springs.

The Most Important Step: Verifying Your Suspension Code

The single biggest mistake when buying a replacement coil spring for these vehicles is getting the wrong one. The correct spring depends on two factors: your vehicle's drivetrain (Front-Wheel Drive or All-Wheel Drive) and its specific suspension package. GM uses Regular Production Option (RPO) codes to identify these packages.

The two main suspension RPO codes for the SRX and 9-4X are:

• FE2: Ride and Handling Suspension
• FE3: Sport Suspension

To find your vehicle's RPO codes, look for the silver 'Service Parts Identification' sticker. It is typically located on the inside of the glove box door, but can sometimes be found in the trunk near the spare tire. The sticker contains a long list of three-character codes. Scan this list for either FE2 or FE3 to determine which suspension your vehicle has.

Buying a Used Coil Spring: What to Inspect

A used OEM coil spring is an excellent, budget-friendly choice. These are simple, durable parts, and an original GM spring is often made of higher quality steel than a cheap aftermarket alternative. However, a thorough inspection is key.

• Verify Compatibility: This is the most important step. Confirm the donor vehicle's year, drivetrain (AWD/FWD), and RPO code (FE2/FE3). If possible, ask the seller to provide a picture of the donor vehicle's RPO sticker.
• Inspect for Cracks: Carefully check the entire spring, paying close attention to the very top and bottom coils where the spring tapers and sits in its mount. This is where cracks most often form. Even a small fracture means the spring is junk.
• Check for Corrosion: Look for heavy rust, pitting, or flaking of the protective coating. While some surface rust is normal, deep corrosion weakens the steel and can lead to failure, especially in areas that use road salt in the winter.
• Buy in Pairs: Always replace coil springs in pairs (left and right side). Springs fatigue and sag over time. Replacing only one will result in an uneven ride height and unbalanced, unpredictable handling. A used pair from the same vehicle ensures they have experienced similar wear.

Replacement Overview & Difficulty

Replacing the rear coil springs on a 2010-2016 SRX or 2011 9-4X is a manageable job for a DIYer with some mechanical experience.

• Difficulty: 2 out of 5.
• Special Tools: Unlike front struts, the rear springs are mounted separately from the shock absorbers. This means a dangerous spring compressor tool is typically not required for the rear. You will need a good set of metric sockets, wrenches, a floor jack, and sturdy jack stands.
• General Procedure: The process involves safely jacking the vehicle and supporting it on jack stands, removing the rear wheel, supporting the lower control arm with a floor jack, unbolting the lower shock absorber mount, and then carefully lowering the control arm until the spring's tension is released and it can be removed. Installation is the reverse of removal.

Cost of Replacement

Opting for a used OEM coil spring can offer significant savings over new parts, especially when compared to dealer prices.

Verified Part Numbers

Part number databases can sometimes be inaccurate. For example, the number 22808430 is sometimes associated with these vehicles but is actually for a Mack truck instrument cluster. Always verify fitment using your VIN and RPO code. Some common, correct part numbers you may encounter for the rear suspension include:

• AC Delco (OEM): 20907392, 20906124
• Moog (Aftermarket): 81731 (Rear Spring Set)

Note that different part numbers exist for FWD, AWD, FE2, and FE3 configurations. The numbers above are for reference and may not fit your specific vehicle.

Frequently Asked Questions (FAQ)