Parts for your 2017 Haval H6-Ignition coils

2017 Haval H6 ignition coils — fitment, purpose and service tips

Ignition coils are absolutely fitted to the 2017 Haval H6. Technical sources including the Haval/Great Wall H6 workshop manual for the GW4C20 2.0‑litre turbo petrol (and the GW4G15B 1.5‑litre turbo used in some markets) specify a coil‑on‑plug direct ignition system. This is also backed up by mainstream aftermarket catalogues (e.g., NGK, Bosch, Denso) that list replacement coil‑on‑plug units for the 2017 H6 sold in Australia and New Zealand.

On this model, each cylinder gets its own coil mounted directly on the spark plug. The job is simple but critical: step up the 12‑volt battery supply to tens of thousands of volts and fire the plug exactly when the ECU commands it. Coil‑on‑plug improves spark energy and timing accuracy, trims electrical losses, and helps the H6 run cleaner and more efficiently.

Coils aren’t a consumable with a set interval, they’re replaced on condition. During routine servicing, a tech will usually inspect the coil boots and plug tubes, check for oil or moisture under the bonnet, and scan for misfire counts. Spark plugs should be changed to spec and on time, because worn or incorrectly gapped plugs make coils work harder and can shorten their life.

• Common signs of a failing coil: rough idle, hesitation under load, higher fuel use, hard starting, and an engine light with P0300–P0304‑type misfire codes.
• Typical causes: heat soak, oil in the plug wells from a rocker cover gasket leak, water ingress from engine‑bay washing, or running the wrong plugs.

Good practice when replacing coils on a 2017 H6:

1. Pinpoint the fault first. Use a scan tool’s misfire counters, do a quick “swap test” between cylinders, and rule out plug or injector issues.
2. If one coil has failed at modest kilometres, replace the single unit and fit new plugs if due. At high kilometres, many workshops recommend replacing coils in pairs or as a set to cut future downtime.
3. Avoid blasting the area with a pressure washer. Keep plug tubes clean and dry, fix any cam cover leaks promptly.
4. When fitting: seat the boot fully on the plug, use a dab of dielectric grease, don’t overtighten the hold‑down (light torque only), and clip the connector until it clicks. Clear codes and road‑test.

Sticking with quality, OE‑spec coils and the right plugs will keep the H6’s turbo petrol engine smooth, efficient and happy on Kiwi and Aussie roads.

Popular questions about 2017 Haval H6 ignition coils

How often should the ignition coils be replaced?
There’s no fixed kilometre interval on the H6, coils are replaced when they fail testing or show symptoms. Many last well beyond 150,000 km. Inspect the boots and plug wells at each service and change spark plugs on time to reduce coil stress.

Should all coils be replaced at once?
Replacing just the failed coil is fine if the vehicle has moderate kilometres and the others test healthy. If the H6 has high kilometres or multiple misfires, replacing coils as a set can be a smart move. Always fit fresh plugs if they’re due.

What causes coil failure on the H6?
Heat, oil contamination from a leaking rocker cover gasket, moisture in plug tubes, incorrect spark plug gaps or types, and rough handling of connectors are the usual culprits. Keeping the top of the engine clean and dry and using the correct plugs goes a long way.