Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Intermittent Grind Growl Noise On 1-2 Shift First Shift Of Drive Cycle (PIP5043B)
Reference number: PIP5043B
Supersedes refnos: PIP5043, PIP5043A
INTERMITTENT GRIND GROWL NOISE ON 1-2 SHIFT FIRST SHIFT OF DRIVE CYCLE
TECHNICAL SERVICE BULLETIN
| Affected Model(s): | 2011-2015 Chevrolet Cruze 2012-2015 Chevrolet Sonic 2011-2015 Buick Regal 2012-2015 Buick Verano Equipped with manual transmission RPO M26 MF3 MR5 MZ0 MZ4 |
| Supercedes: | This PI was superseded to update model years. Please discard PIP5043A. |
SERVICE INFORMATION
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
CONDITION/CONCERN
Some customers may comment on a grind growl noise on the 1-2 shift that can be felt in the clutch pedal and brake pedal if applied during a 1-2 shift under light or normal acceleration. Concern may be hard to duplicate unless making the shift at 10 miles per hour, and only the first time per drive cycle that 10 miles per hour is achieved.
This PI was written for manual shift vehicles as the customer usually notices this coinciding with a shift. Under light to moderate throttle, the upshift light may come on in the 10 MPH range and the customer sees the light and hears this noise which leads the customer to believe that the noise is related to the manual transmission or clutch. This self-test will happen on automatic transmission equipped vehicles as well as it is a normal function of the ABS system to perform this self-test.
RECOMMENDATION/INSTRUCTIONS
This condition can be caused by the anti-lock brake system conducting a self-test at 10 miles per hour and if the customer is shifting at that speed they may feel the condition in the pedal assembly. This is because the pedals and the anti-lock brake system motor are both mounted to the cowl. No repairs should be attempted. Please explain this to your customer.
Perform visual inspection of brake lines to ensure all lines are routed properly and secured, as any lines making contact with another component can further aggravate this condition.
WARRANTY INFORMATION
For vehicles repaired under warranty use:
| Labor Operation | Description | Labor Time |
|---|---|---|
| 2419919 | Customer Concern Not Duplicated (CCND) - Brakes | Use Published Labor Operation Time |
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
NO RELATED
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.