A fluid leak may be visible on the steering gear (Fig. 6) or power steering fluid lines on some 2015-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks. The leak may be due to a damaged seal or leaking lines.
Fig. 6
Fluorescent dye can be used to determine the source of the leak. Clean off any residual oil from the steering gear using an oil/grease cleaner.
Next, add a bottle (1 oz; 30 cc) of fluorescent dye to the power steering reservoir and operate the vehicle for 10 minutes. Use a black light to check for any signs of dye leaking past the seals, lines, coolers, gear and hydraulic brake booster. Mark the location of any leaks. Also check for any fluid dripping from the reservoir/pump.
If a leak is found, check the appropriate Service Information and the Electronic Parts Catalog to see if the leaking component can be repaired.
Seal Kits
Several seal kits are available, so it is usually not necessary to replace the steering gear. Available seal kits include:
- Pitman shaft seals
- Steering gear pitman shaft
- Steering gear valve housing seals (Fig. 7)
- Pressure sensor
- Pressure sensor gasket
Fig. 7
If the steering gear needs to be replaced, mark the location of the leak and identify the type of leak and location in the verbatim section of the repair order.
Leak vs. Seepage
Refer to Bulletin #15-00-89-004 for help identifying the differences between what is considered a fluid leak and what is considered seepage. Seepage is defined as oil, film, or dust accumulation on the exterior of the component. When fluid droplets appear hanging from a component or fluid has dripped to another component, it is considered a leak. (Fig. 8) Improper diagnosis may lead to unnecessary component replacement.
Fig. 8
TIP: Be sure to check Investigate Vehicle History (IVH) in the GM Global Warranty Management system for any issues relating to a specific VIN prior to beginning any inspections and/or repairs.
For more information, including part numbers, refer to Bulletin #26-NA-051.
– Thanks to Kevin Minor
