Vehicles affected:

Year                         Model            Trim              VIN Range

2012                          Pilot               2WD              5FNYF3H..CB029004 and later

2012                          Pilot               4WD              5FNYF3H..CB058214 and later

2-13-15                     Pilot                ALL               ALL

 

For 2012 models, two different PCM’s were used. One manufactured by Keihin and the other by Continental. Software updates are available for both. Software updates were originally available for Keihin PCM’s in 2014 and then for Continental computers mid 2015.

 

Symptom:

Under certain driving conditions, there is excessive vibration between 30 and 65 MPH

 

Possible Causes:

For both 2WD and 4WD vehicles, the calibration for Variable Cylinder Management (VCM) control along with converter clutch apply causes excessive vibrations.

 

Specifically for 4WD vehicles, the output shaft’s center support bearing material may not dampen vibrations affectively in temperatures below 32F.

 

Correction:

Once diagnostics has confirmed the above causes, perform PCM updates as well as to replace the center support bearing for all 4WD applications

 

Software Updates: 

Year/Model                PGM-FI            PGM-FI                       AT                       AT Program         System to Update

                                  Program ID      Program P/N               Program              P/N (or later)     

                                  (or later)            (or later)                      ID (or later)

 

2012 Pilot 2WD         N0A070             37805-RN0-A07         N0A030            37806-RN0-A03    PGM-FI and A/T

2012 Pilot 4WD         N0A970             37805-RN0-A97         N0A930            37806-RN0-A93    PGM-FI and A/T

2013 Pilot 2WD         N0M030             37805-RN0-M03        N0A030            37806-RN0-A03    PGM-FI and A/T

2013 Pilot 4WD         N0M930             37805-RN0-M93        N0A930            37806-RN0-A93    PGM-FI and A/T

2014 Pilot 2WD         N0M030             37805-RN0-M03        N0A030            37806-RN0-A03    PGM-FI and A/T

2014 Pilot 4WD         N0M930             37805-RN0-M93        N0A930            37806-RN0-A93    PGM-FI and A/T

2015 Pilot 2WD         N0M120             37805-RN0-M12        N0A030            37806-RN0-A03    PGM-FI and A/T

2015 Pilot 4WD         N0M820             37805-RN0-M82        N0A930            37806-RN0-A93    PGM-FI and A/T

 

Center Support Parts Information: 

Bolt Washer                                 90382-SZA-003        2 Required

Flange Bolt (10mm x 25mm)       90113-S3V-A00         8 Required

Drive Shaft Assembly (4WD)      40100-SZA-S01        1 Required

 

ATSG Figure 1 2012 to 2015 Honda PilotsThis Honda factory bulletin points out that excessive vibrations can be due to the calibration for Variable Cylinder Management (VCM) control along with converter clutch apply. What it doesn’t tell you is the amount of vehicles using VCM that can be affected by this due to a system malfunction. Typically, there is a complaint of a shudder with light throttle at approximately 45 to 55 mph. This is usually misinterpreted as a converter clutch malfunction. A clue to know that it may be due to the VCM is that the shudder seems to occur whenever the “ECO” Lamp is on. When it is, it means that VCM is active.

Honda and Acura vehicles equipped with six cylinder engines may be packaged with having both Variable Cylinder Management (VCM) and Active Control Engine Mount (ACM) systems. These two systems work together. When VCM is activated, it drops from 6 cylinders to 4 and then to 3. Simultaneously, the ACM system softens liquid filled mounts to absorb the vibration (figure 1). The ACM System is capable of storing electrically and mechanically generated trouble codes for these mounts. But, these mounts can loose some of their liquid without coding. Lose of liquid in these mounts prevents vibration absorption which can be easily mistaken for a converter clutch vibration.  

Honda/Acura states that a slight vibration in “ECO” Mode is considered normal and provides no way to disable system operation. What is does do for unsatisfied customers is to reprogram the vehicle so that “ECO” mode occurs at speeds above 55 miles per hour.  This means you may run into a vehicle with vibrations between 55 and 65 miles per hour. The key is to monitor the ECO light and determine if it is normal operation or failed motor mounts.

As an interesting side note, these vehicles are also equipped with an Active Noise Cancellation (ANC) System. The ANC System uses front and rear sound sensors mounted in the ceiling of the vehicle as well as a ANC Control Module under the dash. The ANC System utilizes the vehicles radio speakers to cancel out noise due to VCM operation by using an opposite phase sound.


Some of the vehicles you may encounter using these systems are:

2005-2007 Honda Accord Hybrid

2005-2010 Honda Odyssey ((EX, LX & Touring models only)

2006 & Later Civic Hybrid

2006 & Later Honda Pilot (2WD models only)

2008-2009 Honda Accord (Except EX, LX V6 & 6MT Coupe)

2010-2012 Honda Accord V6 (Except EX, LX V6 & 6MT Coupe)

2013 & Later Honda Accord V6 (Except 6MT Coupe)

2009 & Later Honda Pilot

2013 Honda Accord V6 (Except 6MT Coupe)

2011-2014 Honda Odyssey

2013 Acura RDX V6

2013 Acura RLX

2014 Acura MDX

2015 Acura RLX Sport Hybrid

 

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