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Service bulletin PIT-5508

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10078887
Published by NHTSA2016-08-25
Manufacturer's numberPIT-5508
Manufacturer's date2016-05-18
NHTSA componentSTEERING:HYDRAULIC POWER ASSIST SYSTEM; EQUIPMENT:APPLIANCE:AIR CONDITIONER

NHTSA's summary

THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ON HOW TO DIAGNOSE AND REPAIR VEHICLES WITH ONE OF THE TWO CONCERNS. VEHICLE MAY HAVE AN INTERMITTENT "SERVICE POWER STEERING, DRIVE WITH CARE" ON THE DRIVER INFORMATION CENTER AND A DIAGNOSTIC TROUBLE CODE C0545 SYMPTOM 00 SET IN THE POWER STEERING CONTROL MODULE. OR THE VEHICLE MAY HAVE INOPERATIVE AIR CONDITION CAUSED BY ANY OF THE FOLLOWING DIAGNOSTIC TROUBLE CODE B393B, FUSE F60UA OR F35UA BEING OPEN, OR A POOR AIR CONDITION COMPRESSOR CLUTCH GROUND. TECHNICIAN WILL GAIN ACCESS TO THE WIRE HARNESS UNDER THE AIR CONDITION COMPRESSOR, INSPECT FOR DAMAGE WIRES AND REPAIR THE WIRES.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Equipment and accessories, Heating and air conditioning, Steering, Power steering

Trouble codes named

B393B, C0545

Vehicles listed
CADILLAC ESCALADE2015, 2016
CADILLAC ESCALADE ESV2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 15002014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SUBURBAN2015, 2016
CHEVROLET TAHOE2015, 2016
GMC SIERRA 15002014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
GMC YUKON2015, 2016
GMC YUKON XL2015, 2016

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
18V5860002018-09-07. STEERING:ELECTRIC POWER ASSIST SYSTEM
17V4140002017-06-29. STEERING:ELECTRIC POWER ASSIST SYSTEM
14V7190002014-11-10. STEERING:ELECTRIC POWER ASSIST SYSTEM
14V3390002014-06-19. SERVICE BRAKES, HYDRAULIC:POWER ASSIST; STEERING:HYDRAULIC POWER ASSIST SYSTEM

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
14743B2023-12-18. Service bulletin. Loss of Electric Power Steering (EPS) Assist
120232002A2023-12-04. Service bulletin. Power Steering Noise or Fluid Leak from Power Steering Pump, Gear or High Pressure Pressure Hose During Extreme Low Temperature Operation (Replace Power Steering Fluid)
PIT5544B2018-11-13. Service bulletin. This Preliminary information communicates information on ahydrauilc rush type noise from the power steering gear. This noise is a characteristic of the new Active Hydraulic Assist System RPO NV8 and no repairs should be made. The noise is most noticeable in the cab at idle, in park, with all accessories turned off.
PIE04302018-06-11. Service bulletin. This engineering informational bulletin is requesting information from the field on vehicles that have the condition of a service power steering message displayed and or a power steering fluid leak.
PIE0430A2018-06-11. Service bulletin. This engineering informational bulletin is requesting information from the field on vehicles that have the condition of a service power steering message displayed and or a power steering fluid leak.
13-02-32-001C2018-05-29. Service bulletin. This technical bulletin provides a procedure to repair any power steering leak that may be caused from extremely low temperatures and use the recommended fluid.
PIT53382018-05-07. Service bulletin. This Preliminary Information communication provides information to the technician about vehicle that may have a Service Power Steering or Service Hybrid System message displayed on the Driver Information Center, Charging System indicator lamp on, Loss of power steering assist, and or Loss of 12 volt battery power. Technician will need to replace the Accessory DC Power Control Module.
12-02-32-002A2018-04-23. Service bulletin. This technical bulletin provides a revision for 12-02-32-002 to add the 2013-2014 model years, add noise as a possible condition and add a Note in the Instructions section.
16-NA-3132017-10-15. Service bulletin. This informational bulletin provides information on a diagnostic procedure for a fluid leak on the power steering unit.
16-NA-1752017-08-15. Service bulletin. This technical bulletin provides a procedure to drain, flush and refill the transmission fluid to correct a customer concern of shake and/or shudder during light throttle acceleration between 48 and 104 KM/H (30 and 65 MPH) at a steady state.