Mopar SP225755AB is the OEM spark plug for the 3.6 in the JL and Gladiator, the same plug as Champion 9417 (type RER8ZWYPB4). It looks almost identical to the JK plug, which is exactly why people order the wrong one. The ceramic and ground electrode differ, so don't assume a JK box fits a JL.
Fitment
2018-and-later Wrangler JL and Gladiator JT with the 3.6 Pentastar. Confirm the number printed on your old plug. Always confirm the number on your old part or run your VIN at a Mopar parts counter before you order.
Common failure symptoms
- Misfire codes (P0300–P0306) or a rough idle
- Hesitation or flat acceleration under load
- Plugs due at the maintenance interval
- Plugs found worn while the upper intake is off for other work
Cross-reference
| Brand | Part number | Notes | Source |
|---|---|---|---|
| Mopar | SP225755AB | Current. Replaces SP225755AA and 68225755AA. | source |
| Champion | 9417 / RER8ZWYPB4 | Same plug. Champion's catalog lists the same 0.043 in gap. | source |
Rebuild, repair or replace?
Always replace, in a set of six. The layout matches the JK: the upper intake comes off to reach the driver-bank plugs. The JL torque table (18 N·m / 13 ft-lbs) matches the JK spec. Don't order a Champion 9407 for a JL and call it done. That's the JK plug. If the old plugs don't show the number clearly, go by your VIN at a Mopar parts counter.
Tip from the JK side that applies here too: while the intake is off, look at the oil filter housing in the valley for weeping oil. That's a known 3.6 leak point, and the same teardown reaches it.
FAQ
Is the JL plug the same as the JK plug?
No. JK is Champion 9407 / Mopar SP149125AF; JL/JT is Champion 9417 / Mopar SP225755AB.
What torque?
13 ft-lbs (18 N·m), per the JL service manual torque table.
Does the Gladiator use the same plug?
Yes, the JT 3.6 uses the same SP225755AB plug as the JL.
Related guides
Sources
Part numbers and fitment were checked against the sources above on October 22, 2026. Mopar supersedes numbers over time. If a newer letter suffix shows up, it generally replaces the one listed here. Back to the parts lookup.