Replacing an ignition coil pack on a Mercedes-Benz V12 sounds simple enough: remove the old unit, connect the new one, clear the fault codes, and enjoy that wonderfully smooth twelve-cylinder engine again.
Unfortunately, on Mercedes M275-powered cars such as the SL65 AMG, S65 AMG, S600 and CL65 AMG, one small installation mistake can turn a brand-new coil pack into a very expensive paperweight.
If you are installing a Mercedes A2751500480 right ignition coil pack, there is one rule we want you to remember before touching the connector:
Once the ignition coil connector has been unplugged, do not immediately plug it back in while the vehicle is still powered or the ignition is on. Fully switch off the ignition first. Our technician recommends waiting approximately 3–5 minutes before reconnecting the ignition coil connector.
That short wait can make a very big difference.
What Is the A2751500480 Ignition Coil Pack?
The A2751500480 is a right-side ignition coil pack used on various Mercedes-Benz models equipped with the M275 V12 engine. Related and interchange part numbers may include A0040103003, A2751500580, A2751500680 and A2751500780, depending on the application and revision.
Typical applications include selected Mercedes-Benz:
- SL65 AMG
- SL600
- S65 AMG
- S600
- CL65 AMG
- CL600
Always confirm your vehicle, VIN and original part number before ordering.
Looking for the right-side Mercedes M275 ignition coil pack?
View the JCarPart A2751500480 Right Ignition Coil Pack
Looking for the left-side Mercedes M275 ignition coil pack?
View the JCarPart A2751500480 Left Ignition Coil Pack
The Installation Mistake That Can Damage a New Coil Pack
Here is the situation we especially want owners and technicians to avoid.
You unplug the ignition coil connector while diagnosing the vehicle. A few seconds later, you plug it straight back in. The key may still be in the ON position, or the electrical system may not have completely powered down.
That is exactly what you should not do.
The M275 ignition system contains sensitive electronics. Reconnecting the coil pack while the circuit is still energized can place the replacement component at risk. If the coil pack is electrically damaged during installation, replacing connectors or clearing fault codes afterward will not bring it back.
In simple terms: do not rush the connector.
How Should You Reconnect the Ignition Coil Connector?
For this replacement part, our technician recommends the following precautions:
- Read the instruction sheet included inside the package before installation.
- Make sure the vehicle ignition is completely switched off.
- If the ignition coil connector has been unplugged, do not immediately reconnect it.
- Wait approximately 3–5 minutes after completely switching off the ignition.
- Only then reconnect the coil pack connector securely.
- Inspect all connectors, wiring and related ignition components before starting the engine.
If the connector was disconnected while the ignition was on, stop and allow the electrical system to power down completely before reconnecting anything.
Misfire After Installation? The Coil Pack May Not Be the Only Problem
Another common frustration with Mercedes M275 engines is assuming every misfire means the coil pack has failed.
It does not.
When several cylinders on the same bank are misfiring, the problem may involve the ignition coil pack, ignition module or ignition transformer. Wiring, connectors, spark plugs and oil contamination around the plug area can also create similar symptoms.
That is why replacing parts without diagnosis can become expensive very quickly.
If your old coil pack failed, it is worth asking one more question before installing the replacement:
Why did the original part fail?
If another component in the ignition system is defective, installing a new coil pack without correcting the underlying problem may not solve the misfire.
Common Symptoms of an M275 Ignition Problem
Owners commonly start investigating the ignition system after noticing symptoms such as:
- Check Engine Light
- P0300 or cylinder-specific misfire codes
- Rough running or shaking
- Loss of power under acceleration
- Misfires during heavy throttle or boost
- Limp mode
- Multiple cylinders misfiring on one engine bank
These symptoms are useful clues, but they do not automatically prove that the coil pack itself is defective. Reading the fault codes and diagnosing the ignition system first can save a lot of unnecessary parts swapping.
A Five-Minute Wait Is Cheaper Than Another Coil Pack
The Mercedes M275 is an impressive engine, but its ignition system deserves patience.
Before installing an A2751500480 ignition coil pack, verify the correct part number, inspect the related ignition system and read the instructions supplied with the product.
Most importantly, remember the connector rule: if the ignition coil plug has been removed, switch the ignition completely off and wait approximately 3–5 minutes before reconnecting it.
It is a small extra step, but when you are working with an M275 V12, small steps can prevent very expensive mistakes.
Need a replacement right-side coil pack for your Mercedes-Benz M275?
Check Fitment and View the A2751500480 Ignition Coil Pack at JCarPart
Frequently Asked Questions
Can I reconnect an M275 ignition coil immediately after unplugging it?
No. For this replacement coil pack, our technician recommends completely switching off the ignition and waiting approximately 3–5 minutes before reconnecting the ignition coil connector.
Does a misfire always mean the M275 coil pack is bad?
No. The coil pack is one possible cause. The ignition transformer/module, spark plugs, connectors, wiring and other ignition-system problems should also be considered during diagnosis.
Is A2751500480 a left or right ignition coil pack?
A2751500480 is associated with the right-side ignition coil pack. Always compare your original part number and vehicle information before purchasing.