5 Common Great Wall Cannon Problems in 2026 and How to Fix Them Yourself

Since its arrival, the Great Wall Cannon has carved out a significant niche in the dual-cab ute market, offering a compelling blend of value, features, and rugged capability. As we move through 2026, a substantial number of these vehicles are now outside their initial warranty period, and a clear pattern of common issues has emerged. For the savvy owner, understanding these common Great Wall Cannon problems isn’t about criticism—it’s about empowerment.

This guide is designed for the DIY enthusiast, the weekend warrior, or any Cannon owner who wants to avoid costly workshop visits for minor issues. We’ll delve into the five most frequently reported problems, explain their likely causes, and provide clear, actionable steps for fixing Great Wall Cannon issues yourself. Let’s get your ute back in fighting shape.

Keeping your Cannon running smoothly ensures it’s always ready for the next adventure. (Image: Representational)

1. Diesel Particulate Filter (DPF) Blockages and Regeneration Issues

The DPF problem is arguably the most notorious issue plaguing modern diesel utilities, and the Cannon is no exception. The filter traps soot to reduce emissions, but it needs to periodically “regenerate” (burn the soot off) at high temperatures. Short, stop-start driving cycles prevent this, leading to warnings, reduced power, and eventually, a forced limp mode.

Symptoms:

• Dashboard DPF warning light (often an orange icon).
• Loss of power, sluggish acceleration.
• Increased fuel consumption.
• In severe cases, the engine may not start.

The DIY Fix:

Don’t panic at the first warning light. Here’s your action plan:

1. Force a Manual Regeneration: If the dashboard indicates “DPF Full” or shows a regeneration request, take the vehicle for a sustained drive. This is the best Cannon DPF fix. Drive for at least 20-30 minutes on a highway or open road, keeping engine RPMs above 2,000 (this usually means a speed of 80km/h+ in 4th or 5th gear). This allows exhaust temperatures to rise and trigger an automatic regeneration.
2. Use a DPF Cleaning Fuel Additive: For mild soot loading, a quality DPF cleaner added to the fuel tank can help break down deposits. Follow the product instructions carefully. Brands like Liqui Moly or Wynns are reputable choices.
3. Check and Clean Related Sensors: A failed Differential Pressure Sensor or faulty exhaust temperature sensors can falsely indicate a blockage. Locate the DPF pressure sensor (on or near the DPF unit), disconnect it, and clean its ports with electrical contact cleaner. Consult your owner’s manual for its exact location.
4. Prevention is Key: Regularly take your Cannon for a good, long drive. If you primarily do city driving, make a conscious effort to take a highway trip once a week.

When to Call a Pro: If the warning light persists after a forced drive, or turns red, the DPF may be severely blocked and require professional forced regeneration or even removal for cleaning.

2. Electrical Gremlins and Infotainment Glitches

As with many modern vehicles packed with technology, the Cannon can suffer from intermittent electrical problems. These often manifest in the infotainment system, instrument cluster, or peripheral features.

Symptoms:

• Touchscreen freezing, rebooting, or going blank.
• Bluetooth connectivity failures.
• Erratic behavior from parking sensors or the reverse camera.
• Unexpected warning lights on the dash.

Electrical resets solve a majority of minor infotainment glitches. (Image: Representational)

The DIY Fix:

Most of these issues are software-related and can be solved with a reset.

1. The Master Reset – Disconnect the Battery: This is the most effective first step. Disconnect the negative (black) terminal of your 12V battery. Wait a full 15-20 minutes. This allows all capacitors in the vehicle’s electronic control units (ECUs) to fully discharge, clearing temporary memory glitches. Reconnect the terminal and tighten securely. You may need to reset your clock and radio presets.
2. Infotainment Soft Reset: Look for a small pinhole reset button on the face of the touchscreen unit. Use a paperclip to press and hold it for 10 seconds. If no button exists, holding the power button for 10-20 seconds may force a reboot.
3. Check for Loose Connections: For issues with specific components like the reverse camera, inspect the wiring harness connections. The camera’s connection is often found behind the interior trim in the tailgate. Ensure plugs are clicked in firmly.
4. Fuse Inspection: Locate your fuse boxes (one under the bonnet, one inside the cabin). Use the diagram on the lid to identify fuses for the audio, infotainment, or ADAS systems. Pull them out and visually inspect the metal strip inside for breaks.

3. Rough Idle, Stalling, and EGR Valve Concerns

A rough, lumpy idle or occasional stalling, especially when the engine is cold, is a common complaint. The usual suspect is the Exhaust Gas Recirculation (EGR) valve or the related EGR cooler. Carbon buildup from recirculated exhaust gases can cause the valve to stick open or closed.

Symptoms:

• Unstable or rough idle, feels like the engine is “shaking.”
• Engine stalling shortly after startup.
• Loss of low-end power.
• Increased exhaust smoke.

The DIY Fix:

1. Clean the EGR Valve:
   • Locate the EGR valve (refer to your manual; it’s typically on the intake manifold).
   • Disconnect the electrical plug and vacuum lines (note their positions).
   • Remove the valve using appropriate sockets/wrenches.
   • Soak the valve and its passages in a dedicated EGR/carbon cleaner. Use a toothbrush and plastic scraper to remove all carbon deposits. Do not use metal tools that could score the sealing surface.
   • Ensure the valve mechanism moves freely before reinstalling with a new gasket.
2. Check and Clean the MAP/MAF Sensors: A dirty Mass Air Flow or Manifold Absolute Pressure sensor can also cause rough running. Spray these sensitive sensors with dedicated MAF cleaner and let them air dry completely.
3. Use a Quality Fuel System Cleaner: Regular use of a diesel-specific injector cleaner can help reduce overall carbon buildup in the intake system.

When to Call a Pro: If cleaning doesn’t solve the issue, the EGR valve may be faulty and need replacement. A diagnostic scan for fault codes is recommended.

4. Clutch Wear and Gear Selection Issues

Owners of manual-transmission Cannons, particularly those used for towing or heavy loads, sometimes report premature clutch wear or difficulty selecting gears. This can be a combination of component wear and adjustment issues.

Symptoms:

• Clutch pedal feeling “spongy” or engaging very high/low.
• Difficulty shifting into gear, especially first and reverse.
• Burning smell or shuddering during clutch engagement.
• Grinding noises when shifting.

The DIY Fix:

1. Check and Adjust Clutch Hydraulic Fluid: Inspect the clutch master cylinder reservoir (usually near the brake fluid reservoir). Top it up with the correct DOT 4 brake fluid if low. Low fluid often indicates a leak in the slave cylinder, which will need professional repair.
2. Bleed the Clutch Hydraulic System: If the pedal feels spongy, air may be in the line. This is a two-person job. One person pumps the clutch pedal, holds it, while the other opens the bleed nipple on the clutch slave cylinder (located on the transmission bellhousing) to release fluid and air. Tighten the nipple before the pedal is released. Repeat until firm.
3. Inspect the Clutch Master Cylinder: Look for signs of fluid leaking down the firewall behind the clutch pedal inside the cabin.
4. Lubricate Linkage and Cables (if applicable): For older or cable-operated systems, ensure the gear selector linkages and cables are properly lubricated.

When to Call a Pro: If adjustments and bleeding don’t restore a firm pedal, the clutch disc, pressure plate, or release bearing is likely worn and requires a major transmission-removal job.

Hydraulic system maintenance can often postpone a major clutch replacement. (Image: Representational)

5. Suspension Noises: Clunks and Creaks

Over rough roads and with age, the Cannon’s suspension can develop annoying noises. These are often simple wear-and-tear items that are perfect for DIY replacement.

Symptoms:

• A loud “clunk” or “knock” over bumps or when turning.
• Persistent squeaking or creaking from the front or rear.
• A feeling of looseness or vagueness in the steering.

The DIY Fix:

1. Identify the Source: Have a helper rock the vehicle side-to-side and front-to-back while you listen and feel around suspension components. Use a pry bar (carefully) to check for play in joints.
2. Common Culprits and Fixes:
   • Sway Bar Links: The most common cause of front-end clunking. Check for torn rubber boots and play in the ball joint. Replacement is straightforward with basic tools.
   • Sway Bar Bushings: Dry, cracked, or worn bushings cause squeaking. Loosen the brackets, replace the polyurethane or rubber bushings, and retighten.
   • Control Arm Bushings/Ball Joints: Worn lower control arm bushings or ball joints cause clunks and looseness. Replacement is more involved but often within a competent DIYer’s ability.
   • Leaf Spring Bushings (Rear): Squeaks from the rear are often from the leaf spring shackle or eye bushings. Lubricate with a dry silicone spray or replace if hardened and cracked.
3. Tighten Everything: Simply go around and ensure all suspension nuts and bolts (especially upper strut mounts, control arm bolts, and sway bar brackets) are torqued to specification. A loose component is a noisy component.

Conclusion: Empowerment Through DIY Maintenance

Owning a Great Wall Cannon in 2026 means you have a capable and value-packed ute. Like any complex machine, it has its known quirks. However, as we’ve shown, many of the most common Great Wall Cannon problems—from DPF warnings and electrical glitches to rough idles and suspension noises—can be diagnosed and often resolved in your own garage with basic tools, patience, and a methodical approach.

Embracing this DIY mindset not only saves you significant money but also deepens your connection with your vehicle, making you a more informed and prepared owner. Always start with the simplest solution: a reset, a clean, or an adjustment. Keep a quality OBD2 scanner handy for reading fault codes, and don’t hesitate to consult online forums specific to the Cannon for community wisdom. With this knowledge, you’re well-equipped to keep your Cannon running strong for many more kilometers and adventures to come.

Disclaimer: This guide is for informational purposes. Always prioritize safety. If you are unsure about any repair, consult a qualified automotive technician. Refer to your official Great Wall Cannon workshop manual for specific procedures and torque specifications.