Terrain FWD L4-2.4L (2010)
Differential Mount: All Technical Service Bulletins
Suspension/Drivetrain - Shudder On Hard Acceleration
TECHNICAL
Bulletin No.: 09-03-08-009B
Date: June 07, 2010
Subject: Shudder in Vehicle Under Moderate to Hard Acceleration (Insert Washers Under RDM and/or Replace Front Springs and/or Replace
Halfshaft)
Models:
2010 Chevrolet Equinox
2010 GMC Terrain
with 2.4L L4 or 3.0L V6 Engine
Built Prior to VIN Breakpoint A6247602
Please Refer to GMVIS
Supercede:
This bulletin is being revised to add vehicle information to the titles in the Correction section. Please discard Corporate Bulletin Number 09-03-08-009A
(Section 03 - Suspension).
Condition
Some customers may comment on these shudder conditions:
-
Lateral shudder - Occurs during accelerator apply (moderate to heavy). Can be intermittent and usually noticeable powering through turns at 40
km/h (25 mph) or less.
Diagnostic Tip
Accelerate the vehicle under moderate to hard pedal. Note that this shudder depends on relative phasing (orientation) of the front halfshaft joints to
each other. So, if a shudder does not occur, this may require re-evaluation after or during a turn (such as driving one way down a street and then
repeating in the other direction). It is usually noticeable with moderate accelerator apply during a turn at lower speeds.
-
Vertical shudder - Occurs during moderate to heavy accelerator apply (32-40 km/h (20-25 mph) and is not intermittent.
Diagnostic Tip
Drive the vehicle in a straight line under moderate to hard acceleration (going up a grade will worsen it).
-
Lateral wobble (low frequency / high amplitude shudder) (Only on V6 AWD and FWD) - Occurs during acceleration (light, moderate, or heavy).
Most noticeable around 64 km/h (40 mph) and up and can be very intermittent (comes and goes at random). Sometimes appears briefly and other
times will stay for an extended period of time.
Diagnostic Tip
Requires accelerator apply and can be very intermittent. If left front halfshaft - will be worse when turning to left (lifting left side of vehicle); If
right front halfshaft - will be worse when turning to right (lifting right side of vehicle).
Cause
This condition may be caused by the standing height of the AWD configurations, which may be too high, increasing the axle joint angles beyond their
optimum operating range. The shudder may vary based on the relative phasing of the left and right halfshaft joints.
Correction
Important
Do Not replace the front drive axles.
Important
Do Not replace springs for FWD configuration.
