Chevrolet Equinox Service Manual: #PIT5063C: Diagnostic Tip - Service Steering Message or Service Stability Message - (Aug 23, 2013)

Subject:	Diagnostic Tip - Service Steering Message or Service Stability Message
Models:	2010 - 2014 Buick LaCrosse (with RPO NJ1)
	2012 - 2014 Buick Regal (with RPO NJ1)
	2012 - 2014 Buick Verano
	2010 - 2014 Chevrolet Cruze, Equinox
	2011 - 2014 Chevrolet Volt
	2013 - 2014 Chevrolet Malibu
	2014 Chevrolet Impala (with RPO NJ1)
	2010 - 2014 GMC Terrain
	With one or more of the following DTC C056E Sym 42 C0569 Sym 3A C0710 Sym 71 or 00

This PI was superseded to update model list and add warranty info. Please discardPIT5063B.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) describedin this PI.

Condition/Concern

Customer may comment on one or both of the following:

* Service Steering Message

* Service Stability Message

The Technician may find DTC C056E Sym 42 calibration data set not programmed. TheDTC C0569 Sym 3A sets after a new steering gear assembly was installed.

Recommendation/Instructions

Important:Before diagnosing DTC C056E Sym 42 or DTC C0569 Sym 3A: If a steering angle sensorDTC C0710 Sym 71 (invalid serial data) or 00 is set, the C0710 must be fixed firstin order to learn steering angle in the EBCM and PSCM or the TIS2WEB steering gear“set-up” will fail. When a Steering Angle Sensor (SAS) on the chassis bus fails, aC0710 Sym 71 or 00 sets. The C0710 will be found in two modules: the EBCMand the PSCM (if equipped with electric steering).

The SAS sensor/module can store C056D Sym 00 (internal hardware fault), diagnose thiscode first. The Power Steering Gear assembly does not have an internal Steering AngleSensor. Rather, it uses the steering angle sensor data from the EBCM. The Power steeringcontrol module learns the SAS that is on the Chassis Bus from the EBCM through highspeed LAN.

DTC C056E Sym 42 or C0569 Sym 3A: The Power Steering Control Module (PSCM) can setDTC C056E Sym 42 when a steering gear assembly was replaced without SPS programming.

DTC C0569 Sym 3A can set from a previous motor/module or steering gear replacementthat was not previously programmed correctly or has internal module data missing.DTC C0569 Sym 3A can also set if an incorrect steering gear assembly part number wasinstalled. Below are some examples related to the codes that set:

Example 1: Previous repair from a body shop with a steering gear replacement withoutSPS programming or Set-up. The steering will work normal with no service steeringmessage. This allows the technician time to set the wheel alignment. After some timethe (PSCM) Power Steering Control Module will set a latched DTC of C056E symptom 42(calibration data set not programmed) resulting in a Service Steering Message. TheService informationwill instruct to program the PSCM using TIS2WEB and then Set-up. During Set-up itfails because too much time has passed without software programming and set up. Ifusing GDS performing the soft-stop learn function will appear to be completed butthe DTC C056E 42 will not clear from the PSCM. At this point the complete steeringgear assembly must be replaced and programmed.

Example 2: If a “Prepare module for removal” was performed from a Power steering gearassembly that contained C056E 42 from a non programmed module and a newly installedsteering gear assembly was just installed and after SPS programming the DTC C05693A set. Confirm that the correct steering gear part number was installed. At thispoint contact the TCSC (Techline) for special programming instructions.

Important:The only time a "Prepare Module for Removal” is performed is when a motor/module (PowerPack) is replaced for motor fault DTC C0475.

Note:When a new steering gear is replaced, perform the following steps:

Install the steering gear assemblySet the alignment toe3. SPS program the EPS module using TIS2WEBPerform the EPS Set-up Procedure using TIS2WEB (this will learn SAS from the EBCMand learns end-stop).Warranty Information

The correction for this concern may be one of several repairs described above. Forvehicles repaired under warranty, please use the appropriate warranty labor operationbased on the actual cause and repair.

Please follow this diagnostic or repair process thoroughly and complete each step.If the condition exhibited is resolved without completing every step, the remainingsteps do not need to be performed.

GM bulletins are intended for use by professional technicians,NOT a "do-it-yourselfer".  They are written to inform thesetechnicians of conditions that may occur on some vehicles, or toprovide information that could assist in the proper service of avehicle.  Properly trained technicians have the equipment,tools, safety instructions, and know-how to do a job properly andsafely.  If a condition is described, DO NOT assume that thebulletin applies to your vehicle, or that your vehicle will havethat condition.  See your GM dealer for information on whetheryour vehicle may benefit from the information.

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