This page lists 9 ignition parts for the 2021 Chevrolet Silverado 4500 HD, across 8 part types, covering the 6.6L V8 DIESEL Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
The ignition system on the 2021 Chevrolet Silverado 4500 HD delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules. The largest groups are Crankshaft Position Sensor (2 parts), Camshaft Position Sensor (1 part) and Camshaft Position Sensor Interrupter (1 part). The other 5 part types cover the remaining 5 parts.
The 2021 Chevrolet Silverado 4500 HD came with a single engine, the 6.6L V8 DIESEL Turbocharged, and every part is verified against it.
3 brands supply ignition parts for the 2021 Chevrolet Silverado 4500 HD, led by GM GENUINE (7 parts), SPECTRA PREMIUM (1 part) and TOP NOTCH (1 part). Quality grades include Economy and Standard Replacement.
Each part number listed for the 2021 Chevrolet Silverado 4500 HD opens a page with every vehicle that part fits.
Camshaft Position Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 12636947 | 🇺🇸 US 🇨🇦 CA | International Truck(ITT) | View on Amazon |
This table covers the sensors that report camshaft position to the ECU. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.
This group shows a single part: GM GENUINE 12636947.
Camshaft Position Sensor Interrupter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 12633929 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the interrupter wheels the camshaft sensor reads.
This group shows a single part: GM GENUINE 12633929.
Camshaft Position Sensor Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 12626252 | 🇺🇸 US 🇨🇦 CA | Color: Orange | View on Amazon |
This table covers the seals at the Camshaft Position Sensor. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
One part is listed for the 2021 Chevrolet Silverado 4500 HD — GM GENUINE 12626252.
Crankshaft Position Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM | S10567 | 🇺🇸 US | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 12641040 | 🇺🇸 US 🇨🇦 CA | International Truck(ITT) | View on Amazon |
This table covers the sensors that report crankshaft position and engine speed. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.
2 Crankshaft Position Sensor parts for the 2021 Chevrolet Silverado 4500 HD come from 2 brands — SPECTRA PREMIUM and GM GENUINE.
The Economy section lists 1 option from SPECTRA PREMIUM — the catalog's value-priced group. SPECTRA PREMIUM S10567 is listed in this group.
In the Standard Replacement grade, GM GENUINE supplies 1 part: built to original-equipment specification. A representative part number is GM GENUINE 12641040.
This group includes SPECTRA PREMIUM S10567 and GM GENUINE 12641040.
Crankshaft Position Sensor Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 12626252 | 🇺🇸 US 🇨🇦 CA | Color: Orange | View on Amazon |
This table covers the seals at the Crankshaft Position Sensor. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
One part is listed for the 2021 Chevrolet Silverado 4500 HD — GM GENUINE 12626252.
Diesel Glow Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TOP NOTCH | TN68G | 🇺🇸 US | View on Amazon |
This table covers the Diesel Glow plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes.
One part is listed for the 2021 Chevrolet Silverado 4500 HD — TOP NOTCH TN68G.
Diesel Glow Plug Controller
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 12746363 | 🇺🇸 US 🇨🇦 CA | LABELED 12746363, 12687698 | View on Amazon |
This table covers the controllers that fire the glow plugs.
One part is listed for the 2021 Chevrolet Silverado 4500 HD — GM GENUINE 12746363.
Ignition Lock Cylinder
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 84668679 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the lock cylinders in the ignition switch.
This group shows a single part: GM GENUINE 84668679.
Buying Ignition Parts for a 2021 Chevrolet Silverado 4500 HD
On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
- Confirm you have the 6.6L V8 DIESEL Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Crankshaft Position Sensor and Camshaft Position Sensor .
Frequently Asked Questions
How many ignition parts fit the 2021 Chevrolet Silverado 4500 HD?
Our catalog currently lists 9 ignition parts for the 2021 Chevrolet Silverado 4500 HD across 8 subcategories and 3 brands, covering the 6.6L V8 DIESEL Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of ignition problems on a 2021 Chevrolet Silverado 4500 HD?
Common symptoms include misfires under load, rough idle, flashing check-engine light, or poor starting in damp weather. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Chevrolet Silverado 4500 HD was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Chevrolet Silverado 4500 HD?
Every part on this page is matched to the 6.6L V8 DIESEL Turbocharged engine. Then gap matters even on “pre-gapped” plugs — verify against spec, and replace coil boots when they come off a high-mileage engine. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Chevrolet Silverado 4500 HD
Ignition Parts for Other Chevrolet Silverado 4500 HD Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.