AMP Research Replacement Motor (80-03129-90)
Our PowerStep motor assembly is engineered to restore full operation to your automatic running boards. This factory-replacement component delivers the same torque and reliability as the original motor installed at manufacture.
The 80-03129-90 motor assembly is designed for direct installation into existing PowerStep housings. Each unit undergoes multi-point testing before leaving our facility to ensure proper amperage draw, torque output, and smooth engagement under load.
This motor fits multiple PowerStep generations and is compatible with both 12V and 24V vehicle electrical systems. Installation requires basic hand tools and typically takes 30–45 minutes per side.
Motor assembly specifications
Motor Assembly Construction & Performance
The AMP Research power step motor uses a sealed gearbox design that shields internal components from moisture, mud, and road salt. The motor housing is injection-molded from reinforced nylon that resists impact from road debris and temperature extremes from -40°F to 140°F.
Inside the housing, the drive gear meshes with the PowerStep linkage to extend and retract the step platform. Our motor windings are wound to precise tolerances to maintain consistent torque across the full range of motion. The sealed bearing surfaces reduce friction and extend service life even in high-cycle applications.
Installation & Compatibility
This motor assembly mounts directly into the PowerStep housing using the factory bolt pattern. You’ll need a 10mm socket, T25 Torx driver, and dielectric grease for the electrical connector.
Installation Steps
Remove the existing motor by disconnecting the wiring harness and removing the three mounting bolts. Lift the old motor from the housing and clean any debris from the mounting surface. Position the new motor so the drive gear engages the linkage arm, then install the mounting bolts and torque to 80 inch-pounds. Reconnect the wiring harness and apply a thin coat of dielectric grease to the terminals.
Troubleshooting & Maintenance
Most PowerStep motor failures stem from water intrusion through damaged seals or prolonged operation against an obstruction. Before replacing the motor, inspect the step platform for debris buildup that may cause binding. Check the control module for fault codes that indicate wiring issues rather than motor failure.
If the motor hums but doesn’t move the step, the drive gear may be stripped or the linkage may be jammed. If the motor doesn’t engage at all, test for 12V at the harness connector while the system attempts to deploy. No voltage indicates a wiring or module issue upstream of the motor.
Replacement Parts for AMP Research PowerStep Systems
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Common Questions About the AMP Research PowerStep Motor
Common symptoms include steps that hum but don't move, steps that deploy slowly or only partway, or steps that won't retract. Before replacing the motor, check for debris blocking the step platform and verify that the control module shows no fault codes.
If the motor runs but doesn't move the step, the internal drive gear may be stripped. If the motor doesn't engage at all, test for voltage at the connector while the system tries to deploy. No voltage typically indicates a wiring or control module issue rather than motor failure.
The 80-03129-90 motor fits AMP Research PowerStep systems from 2010 forward, including PowerStep Xtreme and Plug-N-Play variants. This motor is compatible with both 12V and 24V vehicle electrical systems.
PowerStep units manufactured before 2010 use a different motor housing and require part number 80-03129. Check the label on your existing motor or contact us with your vehicle year, make, and model to confirm compatibility.
Installation requires a 10mm socket or wrench, a T25 Torx driver, and dielectric grease for the electrical connections. A torque wrench is recommended to achieve the proper 80 inch-pound specification on the mounting bolts.
Most installations take 30–45 minutes per side. You'll need access to the underside of the vehicle, so a floor jack and jack stands or a vehicle lift make the job easier. The motor can be replaced without removing the entire PowerStep assembly from the vehicle.
Yes, the AMP Research replacement motor includes our standard warranty coverage for replacement parts. Register your purchase within 30 days of installation to activate warranty protection.
Warranty coverage protects against defects in materials and workmanship. Damage from improper installation, vehicle accidents, or operation against obstructions is not covered. Keep your purchase receipt and record the installation date for warranty claims.
You can replace motors individually as they fail. The driver and passenger side motors operate independently, so replacing one side won't affect the other.
However, if one motor has failed due to wear rather than damage, the other motor has experienced similar use and may fail soon. Many customers choose to replace both motors at the same time to avoid a second installation session within a few months.
The most common causes are water intrusion through damaged seals, prolonged operation against an obstruction, and normal wear in high-cycle applications. Off-road use and exposure to road salt accelerate wear on the motor seals and bearings.
To extend motor life, keep the step area clear of debris and rinse the housing periodically in areas with heavy salt use. Avoid repeatedly cycling the steps while they're blocked by snow, ice, or cargo. The thermal protection circuit will shut down the motor if it overheats, but repeated thermal events shorten motor life.
If the steps deploy unexpectedly while driving, the issue is usually with the control module or door sensor rather than the motor itself. The motor only responds to signals from the control module—it doesn't control deployment timing.
Check the door sensor connections and verify that the control module is receiving clean signals. If the motor runs constantly or cycles repeatedly when the doors are closed, inspect the wiring harness for damaged insulation or corroded connections before replacing the motor.