# Service bulletin 17\-NA\-340

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.

- Type: Service bulletin
- NHTSA id: 10190334
- Published by NHTSA: 2021\-04\-15
- Manufacturer's number: 17\-NA\-340
- Manufacturer's date: 2017\-11\-01
- NHTSA component: STEERING:HYDRAULIC POWER ASSIST SYSTEM; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY

## NHTSA's summary

Service Power Steering Message Displayed with a Loss of Power Steering Assist and DTC C056E\-5A Set Condition Some customers may comment on a Service Power Steering Message displayed with a loss of power steering assist. During diagnosis a technician may find DTC C056E\-5A set or stored in the history. Cause This may be due to the Smooth Road Shake Compensation algorithm in the power steering module. Correction Reprogram the power steering control module.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10190334-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10190334-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Equipment and accessories, Steering, Power steering

## Trouble codes named

C056E

## Vehicles listed

- 2017 to 2018 BUICK ENVISION

## Other bulletins for the same vehicles and component

- [PIC6073D](/bulletins/10129901.md), 2018-03-12, Service bulletin: ELECTRICAL SYSTEM; STEERING:ELECTRIC POWER ASSIST SYSTEM; STEERING. This Preliminary Information communication provides information to the technician about the Media Oriented Systems Transport Bus Diagnostic Tool Kit \(EL\-51578\) has been released to help diagnose any of the Media Oriented Systems Transport bus concerns. The kit contains header connectors that are installed to bypass Media Oriented Systems Transport bus modules. The bypass connector also contains a terminal for verifying Media Oriented Systems Transport control circuit voltages. Technician should review Media Oriented Systems Transport bus description and operation and Diagnostic Trouble Code U0028 diagnostic procedures.
- [PIC6048E](/bulletins/10098421.md), 2017-05-05, Service bulletin: STEERING:ELECTRIC POWER ASSIST SYSTEM. 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 \(15.75 IN\).
- [SB\-16\-NA\-109](/bulletins/10078430.md), 2016-08-06, Service bulletin: STEERING:ELECTRIC POWER ASSIST SYSTEM. "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."

JSON: [/v1/bulletins/10190334](/v1/bulletins/10190334)

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