Cummins
Shop All
SKU #: WLK-256-1003
MPN #: 256-1003
Walker Oil Pressure Switch 11-16 GM 6.6L Duramax LML
Description
Is your truck’s dashboard showing false oil pressure warnings? The Walker Oil Pressure Switch restores accurate oil pressure feedback to your engine management system, enabling it to monitor and report real-time engine health properly. A failing oil pressure switch can trigger warning lights, erratic gauges, and even put your truck into limp mode, but installing this direct‑fit replacement restores confidence in your oil system monitoring, helping you know your engine is truly protected.
Built to meet or exceed OEM standards, this pressure switch features a durable housing and quality internal contacts designed to withstand engine bay heat, vibration, and daily service conditions. It installs easily into the factory port, delivers consistent and accurate pressure signals, and helps eliminate false warnings and miscommunication between sensors and your vehicle’s computer. Engineered for long‑term reliability, it provides dependable performance mile after mile.
Enter your zip and we'll see if installation is available.
- Request quotes from local installers at checkout
- Compare options and choose the best fit for your install
About WrenchConnected
WrenchConnected is an independent installation marketplace operating in partnership with Diesel Power Products.
How it works
After checkout, we route your vehicle info and part SKU to verified installation shops near you. Local installers review the job and submit competitive bids; you pick the shop you want based on price, reviews, and availability. Your name and email stay private until you select an installer.
Pricing
You pay for the bid from your preferred shop. The full amount is shown before you confirm — installers cannot add charges without your written consent. Payments are processed securely by Stripe.
Your privacy
During bidding, shops see only your service ZIP code, vehicle year/make/model, and the part SKU — not your name, email, or address. Only the shop you select receives your contact details after payment. We never sell your personal information.
More detail at wrenchconnected.com.
About Walker
Walker Products has built its reputation as a trusted name in the automotive aftermarket by consistently delivering high-quality Sensors and fuel system components that meet or exceed OEM standards. Founded in 1946, Walker has weathered decades of industry change, staying at the forefront of innovation while maintaining a commitment to precision and reliability. From engine sensors and fuel system components to ignition parts and carburetor kits, Walker Products has a solution for nearly every light-duty and heavy-duty vehicle on the road today.
Blog
June 12, 2026
The diesel particulate filter (DPF) on your Cummins engine traps soot before it leaves the tailpipe. Over...
Read MoreCummins DPF Cleaning: Signs, Methods & Tips
June 12, 2026
P2509 flags when your Cummins ECM isn't seeing stable voltage coming from the battery and charging system....
Read MoreP2509 Cummins Code: Causes, Symptoms & Fixes
June 10, 2026
It starts small. Maybe the truck is a little slower to spool than usual. Maybe it sounds...
Read MoreHow to Find a Boost Leak Without Special Tools
June 05, 2026
Your exhaust system moves spent gases out of the engine and away from the cab. The muffler...
Read MoreResonator vs Muffler: Key Differences Explained