Give MAP Sensor Soot the Boot

00:00 What’s going on, guys? Danny from Slow Restoration. Today we’re working on the 2024 GMC Denali Ultimate, and of course the only engine option for these trucks is the L5P Series 2 6.6L Duramax. As you can see by this box here, we’ve got some Banks parts to install — or at least one part.

00:21 Flipping it over, this is the MAP sensor spacer kit. The EGR system can soot up the MAP sensor and cause issues when it gets plugged. So, we picked up this kit from Banks. Let’s open it up. It’s packaged extremely well — probably overkill for what it is. Foam-padded box, instructions (actually just a thank you with a QR code to scan for instructions). Inside: a wrench, a bolt, and the spacer itself.

01:05 It’s a nicely machined aluminum piece with an O-ring on the bottom. Function is simple: it moves the sensor out of the airstream so it doesn’t soot up as quickly, if at all. The MAP sensor doesn’t need to see airflow like a MAF sensor — it just measures pressure in the intake system. So this relocation keeps it cleaner.

01:51 Just to be clear, this part doesn’t add performance — no more power or fuel mileage. It only helps keep the sensor clean longer, which could prevent performance loss down the road. Packaging quality is top notch, and it even comes with a small Banks-logo wrench.

02:31 Scanning the QR code takes you to Banks’ website for instructions. The kit is part #64410, for 2017–2024 L5P Duramax (Series 1 and 2). Banks recommends disconnecting the battery because unplugging the sensor could trigger a code. Personally, I don’t see the need to unplug the sensor since there’s plenty of harness length — as long as the key’s off, we’re fine.

03:50 On the 2024, things look slightly different. There are actually two MAP sensors in the intake horn. I called Banks to verify — you want the top sensor. It’s a three-wire sensor, not four as older instructions say. The lower one is new for 2024 and doesn’t need the spacer.

04:58 Removing the top sensor: 10mm bolt, twist, and pull it out. This truck has just over 7,000 miles, and already there’s soot buildup on the sensor cage. Not terrible yet, but visible. I wiped it down gently. Banks recommends only using mass airflow sensor cleaner if needed — never brake clean or harsh solvents.

07:34 With the sensor cleaned, it’s time to install the spacer. Drop the spacer onto the intake boss, O-ring side down, line up the locating tab, and snug down the supplied bolt (pre-treated with thread locker). Then reinstall the MAP sensor into the spacer with its original bolt. Both bolts just need to be snug — factory torque is light.

09:37 And that’s it — installation complete. Total time: under five minutes, even less once you know the process. Now the MAP sensor sits out of the main airstream, protected from soot buildup caused by EGR and PCV gases. The spacer looks sharp too, with the Banks logo engraved on top.

10:56 I’ll shut the hood, start the truck, and make sure there are no codes. There shouldn’t be — Banks is tried and true. I’m really waiting on the Banks Ram-Air intake and Derringer tuner, but since the 2024s had some changes, they’re still in R&D. In the meantime, I may add Banks boost tubes. Stock piping is a mix of metal and silicone, while the Banks version is 3.5-inch all steel.

13:08 That’s the MAP sensor spacer install on a 2024 GMC Denali Ultimate with the L5P Series 2 Duramax. Super quick, super easy, and it’ll help long-term reliability. Performance parts will come later, but for now, this keeps things clean.