How to Tell if You Need a P or Q Shape Window Motor

How to Tell if You Need a P or Q Shape Window Motor

Window Motor Fitment Guide

How to Tell if You Need a P or Q Shape Window Motor

Some replacement window motors are available in two mirror-opposite versions: P shape and Q shape. The quickest way to tell them apart is to check the motor from the rear side, not the gear side.

Rear view = correct P/Q shape check
Rear View Comparison
I24L8P Rear view
I24L8P window motor rear view showing P shape
P
P shape: round section on the right.
I24L8Q Rear view
I24L8Q window motor rear view showing Q shape
q
Q shape: round section on the left.
!
Important: Identify P or Q from the rear side only. The gear side can make the motor look confusing or reversed.

Why the Shape Matters

P and Q motors are mirror-opposite versions. Choosing the wrong one can stop the motor lining up correctly with the regulator or mounting points.

Still diagnosing the fault? Start with Window Motor vs Regulator or How to Test a Window Motor before ordering.

Use the Rear Side — Not the Gear Side

Use this side

Rear Side / Cover Side

Rear side of I24L8P window motor
Trace the rear outline and match the main shape.
Ignore this side

Gear Side / Output Side

Gear side of I24L8P window motor
Do not identify P or Q from the gear side.

The Quick Check

1
Turn it around View the motor from the rear cover side.
2
Trace the outline Focus on the main body and round section.
3
Match the shape Right = P. Left = q.

Before You Order

Compare your original motor to the product images from the same viewing side. If your window goes down but will not come back up, or the motor runs but the glass does not move, check the fault first using the guides below.

Quick Ordering Checklist

  • Look at the rear side of your original motor.
  • Ignore the gear side for P/Q identification.
  • Check whether the rear shape looks like P or q.
  • Compare against the product listing images.
  • Contact us before ordering if you are unsure.

Helpful guides before replacing parts

Motor vs Regulator How to Test a Window Motor Window Goes Down But Not Up

Need Help Choosing the Right Window Motor?

Send us a photo of your original motor from the rear side and we can help confirm the correct shape before you order.

Browse Window Motors Contact Us
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