Service bulletin 17-NA-158

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)
Type	Service bulletin
NHTSA id	10137654
Published by NHTSA	2018-05-21
Manufacturer's number	17-NA-158
Manufacturer's date	2017-05-10
NHTSA component	STEERING:HYDRAULIC POWER ASSIST SYSTEM

NHTSA's summary

This informational bulletin explains to diagnose and repair the P0128 code before just replacing the power steering gear.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Steering, Power steering

Trouble codes named

P0128

Vehicles listed
CADILLAC XT5	2017
GMC ACADIA	2017

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

Other bulletins for the same vehicles and component
17-NA-284	2021-04-14. Service bulletin. Reduced Steering Assist Message with DTC C0460 Sym 5A Condition Some customers may comment on a Reduced Steering Assist message on the DIC with no loss of steering assist. During diagnosis a technician may find DTC C0460 Sym 5A. Cause The condition is due to Steering Angle Sensor trim error. Note: The calibration allows for an error to set without actual loss of assist. Correction Reprogram the Power Steering Control Module.
18NA009	2018-06-04. Service bulletin. This technical bulletin provides a procedure to replace the P/S hose, O2 sensor and engine harness if P/S fluid has been found leaking and the cause of the Mil on.
17NA284	2018-04-23. Service bulletin. This technical bulletin provides a procedure to reprogram the power steering control module to correct a condition of Reduced Steering Assist Message with DTC C0460 Sym 5A due to a software abnormality.
PIP5545	2018-02-21. Service bulletin. This Preliminary information communicates a possible noise from the water pump causing a DTC and the diagnostics for the repair.
PIP5516A	2018-02-21. Service bulletin. This Preliminary information communicates a possible power steering fluid leak above the engine harness to to the rear( Bank 1) heated Oxygen sensor and direction to replace all involved parts due to this contamination and leak.
PIC6048E	2017-05-05. Service bulletin. THIS PRELIMINARY INFORMATION COMMUNICATION ADVISES THE TECHNICIAN THAT SOME CUSTOMERS MAY COMMENT ON THE OPERATION OF THEIR HAPTIC SEAT DURING A LANE KEEP ASSIST EVENT. LANE KEEP ASSIST WORKS DIFFERENTLY THAN LANE DEPARTURE WARNING. THE LANE KEEP ASSIST ICON IS SOLID AMBER, FORWARD CAMERA MODULE IS ACTIVELY COMMANDING A TORQUE TO ELECTRONIC POWER STEERING. THIS MEANS THAT THE DRIVER SHOULD ALSO FEEL SOME FEEDBACK FROM THE STEERING WHEEL. NO CHIMES OR HAPTIC IN THE SEAT. LANE KEEP ASSIST ICON IS FLASHING AMBER; FORWARD CAMERA MODULE IS ACTIVELY COMMANDING TORQUE TO ELECTRONIC POWER STEERING. THIS WILL ALSO BE ACCOMPANIED WITH LANE DEPARTURE WARNING CHIMES AND HAPTIC IN THE SEAT FEEDBACK BASED ON THE SETTING CHOSEN IN THE VEHICLE SETTINGS. THIS WILL TAKE PLACE WHEN THE VEHICLE HAS CROSSED LANE MARKING BY (40 CM) OR (15.75 IN).
PIC6048B	2017-03-17. Service bulletin. THIS PRELIMINARY INFORMATION COMMUNICATION ADVISES THE TECHNICIAN THAT SOME CUSTOMER MAY COMMENT ON THE OPERATION OF THEIR HAPTIC SEAT DURING A LANE KEEP ASSIST EVENT. LANE KEEP ASSIST WORKS DIFFERENTLY THAN LANE DEPARTURE WARNING. THE LANE KEEP ASSIST ICON IS SOLID AMBER, FORWARD CAMERA MODULE IS ACTIVELY COMMANDING A TORQUE TO ELECTRONIC POWER STEERING. THIS MEANS THAT THE DRIVER SHOULD ALSO FEEL SOME FEEDBACK FROM THE STEERING WHEEL. NO CHIMES OR HAPTIC IN THE SEAT. LANE KEEP ASSIST ICON IS FLASHING AMBER; FORWARD CAMERA MODULE IS ACTIVELY COMMANDING TORQUE TO ELECTRONIC POWER STEERING. THIS WILL ALSO BE ACCOMPANIED WITH LANE DEPARTURE WARNING CHIMES AND HAPTIC IN THE SEAT FEEDBACK BASED ON THE SETTING CHOSEN IN THE VEHICLE SETTINGS. THIS WILL TAKE PLACE WHEN THE VEHICLE HAS CROSSED LANE MARKING BY (40 CM) OR (15.75 IN).
SB-16-NA-109	2016-08-06. Service bulletin. "THIS TECHNICAL BULLETIN PROVIDES A PROCEDURE TO INSPECT THE STEERING GEAR FOR A NORMAL CONDITION OF GREASE OR SEALANT ON EXTERIOR CASE OF GEAR DUE TO THE MANUFACTURING PROCESS."