2012-2016 Cadillac SRX Rear Coil Spring: Solving Sag and Verifying FE2 Suspension

Compatibility: The Most Critical Check

How to Verify Your Suspension Code (RPO)

Before purchasing, you must verify your vehicle's suspension package. General Motors uses Regular Production Option (RPO) codes to identify every feature. You are looking for the code FE2.

1. Locate the Service Parts Identification sticker. This is a silver or white label with dozens of three-character codes.
2. Check these common locations for the sticker: inside the glove box door, or in the rear cargo area under the spare tire cover.
3. Scan the list of codes for "FE2". If you see "FE3", this part is not correct for your vehicle.

Symptoms of a Failing Rear Coil Spring

Coil springs typically fail in two ways: they can lose their tension and sag over time, or they can physically crack and break. Here are the most common symptoms to watch for:

• Vehicle Sagging: The most obvious sign is a lower ride height in the rear. You may notice the car leaning to one corner or the entire rear end sitting lower than the front.
• Clunking or Banging Noises: A broken piece of the spring can move around, creating a loud clunking or rattling sound, especially when going over bumps.
• Excessive Bouncing: While shocks are the primary dampers, weak or sagging springs can contribute to a bouncy, uncontrolled ride and cause the suspension to bottom out over bumps.
• Uneven Tire Wear: Incorrect ride height from a bad spring throws off the vehicle's alignment, which can cause the inside or outside edges of the rear tires to wear out prematurely.
• Poor Handling: The vehicle may feel unstable or sway excessively during turns because the failed spring can't properly manage the vehicle's weight transfer.

Important Note: Rear Toe Link Recall (NHTSA 21V-473)

The 2010-2016 Cadillac SRX was recalled for an issue with the rear suspension toe links, which could become loose or separate. The symptoms of a loose toe link—swaying, instability, uneven rear tire wear, and noise—can be very similar to a bad coil spring. If you are experiencing these issues, it is crucial to have a dealer check if the recall work (GM recall number N212340980) has been performed on your vehicle. A failed toe link can cause a loss of vehicle control.

Buying a Used Coil Spring

A used OEM coil spring is an excellent, cost-effective option, as they rarely fail and an original GM part often has better material quality than a cheap aftermarket alternative. Here's what to look for:

• Verify Compatibility: This is the most important step. Confirm the spring came from a 2012-2016 SRX with AWD and the FE2 suspension. Ask the seller to verify the RPO code from the donor vehicle if possible.
• Physical Inspection: Carefully inspect the entire spring. Look for any cracks, which often occur on the first or last coil. Check the protective coating; while surface rust is usually okay, avoid springs with deep, flaking rust that could indicate the steel has been compromised.
• Check for Sag: When buying a pair, stand them next to each other on a flat surface. They should be the same height. If one is visibly shorter, it has sagged and should be discarded.
• Mileage Isn't Everything: A spring from a 100,000-mile highway-driven car is often in better condition than one from a 50,000-mile city car that has seen more potholes and road salt. Condition and lack of corrosion are more important than mileage alone.

Cost Comparison

Replacement Overview

Replacing the rear coil springs on an SRX is a straightforward job for a DIY mechanic with the right tools. Unlike front struts, the rear springs are separate from the shock absorber and typically do not require a spring compressor, making the job safer and easier.

The basic process involves safely jacking and supporting the vehicle, removing the rear wheel, unbolting the lower shock mount, and carefully lowering the control arm with a jack until the spring tension is released and it can be removed. Installation is the reverse of removal.

Frequently Asked Questions