The wheel position sensor 26091590 plays a key role in GM’s Quadrasteer system. This part helps control rear wheel steering in trucks from 2002 to 2005. If you own a Chevrolet Silverado or GMC Sierra with four-wheel steering, you know how it makes tight turns easy. But when this sensor fails, steering issues pop up fast. In this guide, we cover everything you need to fix and maintain it. We draw from real product data and user experiences to give you solid advice.
What Is Quadrasteer and Why Does It Matter?
GM rolled out Quadrasteer in 2002. It lets rear wheels turn to help with handling. At low speeds, rear wheels turn the opposite way from the front ones. This cuts the turning radius by up to 21 percent. For a big truck, that means you can park like a small car. At high speeds, rear wheels turn the same way for better stability.
Delphi built the system for GM. It uses a special Dana 60 rear axle. The setup adds about 285 pounds but boosts towing power. Trucks with it can haul more, like from 8,700 to 10,000 pounds in some models. Owners love it for towing boats or trailers. It reduces “tail swing” when backing up.
Quadrasteer started as a $7,000 option. GM dropped the price to $5,600, then $2,000, and finally $1,000 to sell more. But sales stayed low. In 2002, only 0.9 percent of eligible trucks got it. That rose to 2.1 percent in 2003 but fell to 1.4 percent in 2004. GM made about 16,000 to 18,000 Quadrasteer vehicles total. They stopped it after 2005 due to cost and low demand.
Today, Quadrasteer lives on in electric trucks like the 2024 Silverado EV. But for classic owners, keeping the system running means focusing on parts like the wheel position sensor 26091590.
How the Quadrasteer System Works
You steer the front wheels as usual. Electronics control the rear ones. Two microprocessors handle it. They read speed and mode.
- At speeds under 45 mph, rear wheels turn opposite to front (up to 15 degrees, or 12 in tow mode).
- At 45-55 mph, rear wheels stay straight.
- Over 55 mph, they turn the same way (up to 5 degrees) for stability.
The system has modes you pick:
- 2-Wheel Steer: Rear wheels lock straight. Good for highways.
- 4-Wheel Steer: Full use for city driving.
- Tow Mode: Limits rear turn to 12 degrees. Helps with trailers.
A dash switch lets you change modes. Lights show what’s active. If something fails, a “Service 4-Wheel Steer” message appears.
The wheel position sensor 26091590 sits at the rear steering rack’s bottom. It reads the rear wheels’ angle. This info goes to the control module. Without it, the system can’t align wheels right.
The Role of the Wheel Position Sensor 26091590 in Quadrasteer
This sensor tracks rear wheel position. GM calls it the “Sensor Kit, Rear Wheel Steering Position.” Part number 26091590 includes the sensor, O-ring, end cap, and screws.
Key specs from GM:
- Dimensions: 5.3 x 5.3 x 7.7 inches
- Weight: 1.3 pounds
- Position: Rear
- Fit: Direct replacement
- Brand: Genuine GM
- Condition: New (but discontinued now)
It uses a 4-wire plug. Two wires send position data (sine and cosine waves). Others provide power and ground.
The sensor has no moving parts in some aftermarket versions. But OEM ones can fail from water. Bad seals let moisture in, causing shorts or corrosion.
Why is it vital? It ensures rear wheels match front ones. If off, steering feels wrong. The module might lock rear wheels straight for safety.
Compatible Vehicles for the Wheel Position Sensor 26091590
GM made this part for specific Quadrasteer models. Check your VIN or build sheet for option code NYS.
From GM data, it fits:
- Chevrolet Silverado (2002-2005): 1500 Crew Cab Long Box, 1500 Extended Cab Long Box, 1500 Extended Cab Standard Box, 2500 Crew Cab Long Box, 2500 Crew Cab Standard Box. Engines: 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.6L Diesel, 8 Cyl 8.1L.
- Chevrolet Suburban (2002-2005): 3/4 Ton, XL 3/4 Ton. Engines: 8 Cyl 6.0L, 8 Cyl 8.1L.
- GMC Sierra (2002-2005): Same configs as Silverado. Includes Denali models.
- GMC Yukon XL (2003-2005): 3/4 Ton. Engines: 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 8.1L.
- Cadillac Escalade (2005): 8 Cyl 5.3L, 8 Cyl 6.0L, 3/4 Ton.
Not all trims had Quadrasteer. It was mostly on 1500HD and 2500 series. Sierra Denali made it standard for a bit. About 5,502 units sold in 2004, mostly Sierras.
If your truck has flared rear fenders and cab marker lights, it likely has Quadrasteer. The rear track is wider by 4-6 inches.
Symptoms of a Bad Wheel Position Sensor 26091590
A failing sensor shows clear signs. Catch them early to avoid bigger issues.
Common symptoms:
- Service 4-Wheel Steer Message: Dash light comes on. System locks in 2-wheel mode.
- Erratic Rear Steering: Rear wheels turn wrong or stick at an angle. Truck “crabs” sideways.
- No Response to Mode Switch: Can’t switch to 4-wheel or tow mode.
- Steering Feels Loose: Especially when accelerating or braking. Rear end shifts.
- Trouble Codes: Scan for C0522 (rear position sensor circuit). Or C0455 (front sensor issues, but check rear too).
- Water Damage Signs: If you see rust or moisture near the sensor, it’s bad.
Users report it after 100,000-150,000 miles. Water from bad boots is common. One owner said: “My rear end moves when I get on it and let off the gas.” Another: “Wheels stuck at wrong angle going down the road.”
If ignored, it can strain the steering rack. Replace soon.
Diagnosing Issues with the Wheel Position Sensor 26091590
Don’t guess. Test it right.
Steps to diagnose:
- Scan for Codes: Use an OBD-II scanner. Look for Quadrasteer codes like C0522.
- Check Wiring: Inspect the 4-pin plug. Wires: Tan (ground), White (5V reference), Dark Green and Dark Blue (signal).
- Measure Resistance: With key off, check between Tan and signals. Should be steady.
- Voltage Test: Key on, backprobe White wire for 5V. If low, check module or yaw sensor.
- Visual Check: Look for water in housing. Pry off end cap carefully.
If voltage is off or codes point to sensor, replace it. Tools needed: Multimeter, scanner.
Step-by-Step Guide: How to Replace the Wheel Position Sensor 26091590
You can do this in your garage. It takes 1-2 hours. No scan tool needed for most.
Tools:
- 18mm socket (skid plate)
- Allen wrenches (sensor bolts)
- Oversize screwdriver (pry cover)
- Dielectric grease
- Anti-seize
Steps:
- Park Safely: Straight wheels, key off. Chock tires.
- Access Sensor: Under truck, rear axle. Remove skid plate if present (18mm bolts).
- Disconnect Plug: Unplug 4-wire connector.
- Remove End Cap: Pry off aluminum cap. Watch for O-ring.
- Extract Old Sensor: Use allen wrench to loosen. Pull out gently. Note spline position.
- Install New One: Apply anti-seize to threads. Insert on spline. Tighten.
- Seal It: Grease O-ring. Replace cap and screws.
- Reconnect: Plug in. Secure wires high to avoid water.
- Test: Start truck. Clear codes if needed. Drive and check modes.
For aftermarket like Goood Systems: It’s plug-n-play. No wiring. Housing is sealed Delrin. Magnet on spline for contactless read. Accurate to 0.3 degrees.
Tips: Keep wheels straight during install. If “Service” light stays, check fuses or module.
Where to Buy the Wheel Position Sensor 26091590
GM discontinued it. But options exist.
- OEM Used: Check eBay for used GM OEM Quadrasteer sensor. Prices $200-1,350. Ensure tested.
- GM Parts Sites: GM Parts Giant lists it, but stock varies. MSRP was around $400.
- Aftermarket: Goood Systems Quadrasteer sensor at $500. Waterproof, 6-month warranty. Bulk discount for 5+.
Alternates: 26079111 (same kit). Or Wells SU7859 ($475 at AutoZone).
For more auto resources, visit Laaster.
Maintenance Tips for Quadrasteer Systems
Keep your system running long.
- Check Seals: Inspect boots yearly. Replace if cracked.
- Grease Joints: Use dielectric on plugs.
- Avoid Water: Don’t submerge axle. Fix leaks.
- Scan Regularly: Check codes every oil change.
- Tire Alignment: Keep tires even. Quadrasteer needs straight setup.
Owners say packing grease prevents water issues. One tip: “Use phone support from instructions.”
History and Legacy of Quadrasteer
GM eyed four-wheel steering in the 1990s. They worked with Delphi on GMT800 trucks. Debut at 2002 auto show on Sierra Denali.
It shone for towing. But high cost hurt sales. Only 5,502 in 2004. Delphi’s bankruptcy in 2005 sealed its fate.
Now, EVs revive it. Silverado EV turns rear wheels 10 degrees. Better tech, no mechanical links.
Stats: Turning radius drops from 47 to 37 feet. Tow capacity up. But only 1-2% adoption.
Quotes: “Best invention no one wanted.” – MotorBiscuit.
Common Myths About the Wheel Position Sensor 26091590
Myth: It’s hard to find. Fact: Aftermarket fills the gap.
Myth: Needs dealer reset. Fact: Plug-n-play often works.
Myth: Only for pros. Fact: DIY with tools.
Troubleshooting Advanced Issues
If sensor swap doesn’t fix:
- Check yaw sensor (under console).
- Inspect mega fuse.
- Test module (rare fail).
Code C0455? Front sensor issue.
Benefits of Upgrading to Aftermarket Sensors
Goood Systems version:
- Sealed: No water entry.
- No moving parts: Lasts longer.
- Pigtail: Keeps connector dry.
- Warranty: 6 months.
Users say: “Better than OEM.” One review: “Installed in 30 min. No scan needed.”
FAQs About the Wheel Position Sensor 26091590
What does the wheel position sensor 26091590 do? It measures rear wheel angle for precise steering.
How do I know if my sensor is bad? Look for dash messages or erratic steering.
Can I drive with a bad sensor? Yes, but in 2-wheel mode. Fix soon.
Where can I buy a replacement? Try eBay, GM sites, or aftermarket like Goood Systems.
Is Quadrasteer worth fixing? Yes, for better handling and value.
Conclusion
The wheel position sensor 26091590 keeps your Quadrasteer truck agile and safe. From diagnosing symptoms to easy replacement, this guide helps you handle it. With proper care, your GM ride stays top-notch. Remember, quick fixes prevent big problems.
Have you replaced your wheel position sensor 26091590? Share your tips in the comments!
References
- eBay Listing for Used Sensor – Provides images and condition details for OEM parts.
- GM Parts Giant Page – Official specs, fitment, and warranty info.
- Goood Systems Product – Aftermarket options with installation tips and reviews.