The 2013 Jeep Grand Cherokee (JGC) offers an available Quadra-Lift air suspension system that provides adjustable ride height and improved off-road capability. However, like any complex system, it can develop problems over time. Understanding the key air suspension parts, their common failure points, and your replacement options is essential for keeping your JGC riding smoothly. This guide covers everything you need to know about 2013 JGC air suspension parts, from compressors and struts to control modules and air springs.
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Common Air Suspension Problems in the 2013 JGC
The air suspension on the 2013 Grand Cherokee is generally reliable, but owners often report issues after 60,000–100,000 miles. The most frequent problems include:
- Compressor failure: The compressor works hard to maintain system pressure. Over time, moisture and debris can cause internal damage or overheating.
- Air spring leaks: Front or rear air springs can develop cracks or pinhole leaks, leading to a sagging ride or compressor overwork.
- Height sensor malfunction: Sensors that monitor ride height can fail or become misaligned, causing uneven ride height or warning lights.
- Valve block issues: The valve block controls air distribution; it can stick or leak, resulting in poor system response.
- Dried-out seals: Over time, seals in the struts or air springs can degrade, causing gradual air loss.
Recognizing early symptoms—such as the compressor running excessively, the vehicle sitting low, or a “Service Air Suspension” message—can help you address problems before they escalate.
Key 2013 JGC Air Suspension Parts
Whether you’re repairing or upgrading, these are the primary components you’ll encounter:
Air Compressor Assembly
The compressor is the heart of the system. It pressurizes the air springs and maintains the correct ride height. OEM part numbers include 68139873AB or 68139873AC. Aftermarket options are available from brands like Arnott, Dorman, and Bilstein. When replacing the compressor, it’s also wise to replace the dryer (desiccant) cartridge to prevent moisture damage.
Front and Rear Air Springs (Struts)
Each wheel has an air spring (air strut) that supports the vehicle’s weight. Front struts are usually sold as assemblies with the shock absorber and air bag. Rear air springs may be separate from the shock. Common OEM numbers:
- Front left: 68139867AA / Front right: 68139868AA
- Rear (pair): 68139875AA
Aftermarket air springs from Arnott, Dorman, and Vogue are popular. Some owners convert to coil springs, but that’s a separate choice.
Height Sensors
There are four height sensors—one per wheel—that relay ride height data to the control module. Part numbers: 56029506AB (front left), 56029507AB (front right), 56029508AB (rear left), 56029509AB (rear right). Sensors can be replaced individually; they’re relatively inexpensive compared to other parts.
Valve Block (Solenoid Block)
Located near the compressor, the valve block directs air to each corner. It includes solenoids that can fail. Replacement part numbers: 68139873AB (includes compressor on some units) or separate block 68004072AA. Cleaning or replacing the valve block may resolve uneven ride height issues.
Control Module (ECU)
The air suspension control module manages the system based on sensor inputs. It’s mounted behind the glove box or under the dash. Part number: 56029193AC. If the module fails, you may get error codes or complete system failure. Reprogramming is often needed after replacement.
Air Lines and Fittings
Cracked or disconnected air lines can cause sudden loss of pressure. Use OEM-style nylon tubing with push-to-connect fittings. Common line sizes are 5mm (front) and 6mm (rear). Check for leaks at connections and along the frame.
OEM vs. Aftermarket Parts: Which Should You Choose?
For critical parts like the compressor and air springs, quality matters. OEM parts from Jeep offer guaranteed fit and durability but come at a premium. Aftermarket options can save money, but quality varies:
- Arnott: Known for remanufactured compressors and air springs with good warranties. Many owners report long service life.
- Dorman: Offers aftermarket air springs and compressors at a lower price point. Some have mixed reviews regarding longevity.
- Bilstein: Their b6 air struts are a popular upgrade, offering better damping but higher cost.
- Vogue: A newer player; some owners use them as budget replacements.
Bottom line: If your 2013 JGC has over 80,000 miles, replacing with high-quality aftermarket parts (like Arnott) is often a smart investment. For low-mileage cars, OEM may be preferable.
Replacing vs. Converting to Coil Springs
Some owners facing repeated air suspension issues consider converting to a conventional coil spring setup. Conversion kits are available from companies like Arnott, Mopar, and others. Pros:
- Eliminates future air suspension problems
- Lower cost for parts and labor
- Potentially more reliable in harsh conditions
Cons:
- Loss of ride height adjustability
- Possible change in ride quality (harsher)
- Need for suspension re-calibration and control module reprogramming
Conversion is a viable option if you rarely use the adjustable height feature and want to minimize future expenses.
How to Diagnose Air Suspension Problems Yourself
Before buying parts, narrow down the issue with simple checks:
- Visual inspection: Look for sagging corners, visible air spring cracks, or broken lines.
- Listen for the compressor: Does it run more than 30 seconds? Under normal operation, it should run for about 10–20 seconds after startup and then shut off. Continuous running suggests a leak.
- Check for error codes: Use an OBD-II scanner that supports air suspension codes. Common codes like C157B (compressor relay), C157C (vent solenoid), or C1581 (pressure too low) point to specific parts.
- Soapy water test: For air springs, spray a soapy water solution on the bags; bubbles indicate a leak.
- Test height sensors: Disconnect sensor links and manually move the arm while watching ride height changes—this can identify sensor failure.
Recommended Replacement Strategy for the 2013 Jeep Grand Cherokee
When one air suspension component fails, others may not be far behind. A strategic approach saves time and money:
- Replace the compressor and dryer together if the compressor has run excessively or is old. The dryer is cheap and prevents moisture from damaging the new compressor.
- Replace air springs in pairs (both front or both rear) to maintain even ride height. The side that hasn’t failed is likely worn too.
- Consider replacing all four height sensors if you have multiple sensor faults—they’re relatively cheap and easy to replace.
- Inspect the valve block if you have air distribution issues. A simple solenoid cleaning may work, but replacement is more reliable.
Example: If your front left air spring leaks, replace both front struts (or air springs) and consider a new compressor if it’s old. This prevents a soon-to-fail component from leaving you stranded.
Final Recommendation
For most 2013 JGC owners needing air suspension parts, the smartest path is:
- For a single failed air spring: Replace the pair with quality aftermarket units from Arnott or OEM (if budget allows).
- For compressor failure: Replace with a remanufactured Arnott compressor (includes new dryer) or a new OEM unit.
- For multiple component failures (especially above 100,000 miles): Evaluate a full conversion to coil springs only if you don’t need ride height adjustability. Otherwise, replace the entire air suspension system with high-quality aftermarket parts.
Always match parts to your specific model (2013 JGC with Quadra-Lift, not Quadra-Drive II without air suspension). Verify VIN and build date to ensure correct fitment. Replacing air suspension parts on your 2013 Grand Cherokee can restore its factory ride and off-road capability—just choose parts wisely and address problems early.