Introduction
The Actron CP9125 PocketScan Code Reader is a diagnostic tool designed to retrieve On-Board Diagnostics II (OBD II) and Controller Area Network (CAN) diagnostic trouble codes (DTCs) from vehicles. This device is compatible with all 1996 and newer cars, light trucks, vans, and SUVs sold in the United States, as well as select 1994-1995 OBD II compliant vehicles. It assists users in identifying the cause of the 'Check Engine' light and clearing codes after necessary repairs have been performed. The PocketScan also displays emissions readiness status.
Safety Information
- Always operate the vehicle in a well-ventilated area. Exhaust fumes contain carbon monoxide, which is a hazardous gas.
- Wear appropriate eye protection when working on or under a vehicle.
- Avoid contact with hot engine parts and moving components.
- Ensure the vehicle is in park (P) or neutral (N) with the parking brake engaged before connecting or operating the device.
- Do not attempt to connect or disconnect the device while the vehicle is in motion.
- Keep the device dry and clean. Do not expose it to extreme temperatures or moisture.
Package Contents
Verify that all items are present in the package:
- Actron CP9125 PocketScan Code Reader
- User Manual
Product Overview
The Actron CP9125 PocketScan is a compact, handheld device featuring a clear display and intuitive buttons for operation. It connects directly to your vehicle's On-Board Diagnostics II (OBD II) port.

Image: The Actron CP9125 PocketScan Code Reader, showing its display and control buttons. The screen displays a diagnostic trouble code (DTC) 'P0305'.
The device is powered directly from the vehicle's OBD II port, eliminating the need for external batteries. It includes a permanently attached 16-pin connector cable.
- Display Screen: Shows diagnostic trouble codes, emissions status, and other relevant information.
- READ Button: Used to retrieve diagnostic trouble codes and view vehicle information.
- ERASE Button: Used to clear diagnostic trouble codes and turn off the 'Check Engine' light.
- Up/Down Arrows: Used to navigate through menus and code definitions on the display.
- OBD II Connector: Connects the device to the vehicle's OBD II port.
Setup
To begin using your Actron CP9125 PocketScan Code Reader, follow these steps:
- Locate the OBD II Port: The OBD II port is typically located under the dashboard on the driver's side of the vehicle. Refer to your vehicle's owner's manual for the exact location if you cannot find it.
- Connect the Code Reader: With the vehicle's ignition off, firmly plug the CP9125's 16-pin connector into the vehicle's OBD II port. Ensure a secure connection.
- Power On: Turn the vehicle's ignition to the 'ON' position (do not start the engine). The CP9125 will power on automatically through the OBD II connection.

Image: A close-up view of a standard 16-pin OBD II diagnostic port, typically found under the vehicle's dashboard.

Image: A person's hands connecting the Actron CP9125 PocketScan Code Reader to the OBD II port located under the vehicle's dashboard.
Operating Instructions
Reading Diagnostic Trouble Codes (DTCs)
- Ensure the CP9125 is properly connected to the vehicle's OBD II port and the ignition is in the 'ON' position.
- Press the READ button. The device will scan the vehicle's computer for stored DTCs.
- The display will show any detected codes (e.g., P0305). Use the Up/Down arrow buttons to scroll through multiple codes if present.
- Refer to the included user manual or an online database for detailed definitions of the displayed codes. The CP9125 includes access to a database of over 5,000 trouble codes.
Erasing Diagnostic Trouble Codes (DTCs)
After performing repairs based on the retrieved DTCs, you can clear the codes and turn off the 'Check Engine' light.
- Ensure the CP9125 is connected and the ignition is in the 'ON' position (engine off).
- Press the ERASE button.
- The device may prompt you to confirm the action. Confirm to proceed.
- The 'Check Engine' light should turn off, and the stored DTCs will be cleared from the vehicle's computer.
Viewing Emissions Status
The CP9125 can display the vehicle's emissions readiness status, which indicates if the vehicle's emission control systems have completed their self-tests. This information is useful for emissions inspections.
- With the device connected and ignition 'ON', navigate through the menu using the arrow buttons until the emissions status is displayed.
- The display will show the status of various monitors (e.g., O2 Sensor, Catalyst, EVAP System) as 'Ready' or 'Not Ready'.
Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the CP9125 in a clean, dry environment away from direct sunlight and extreme temperatures.
- Cable Care: Avoid kinking or sharply bending the attached OBD II cable.
Troubleshooting
- Device Does Not Power On: Ensure the OBD II connector is fully seated in the vehicle's port and the vehicle's ignition is in the 'ON' position. Check the vehicle's fuse for the OBD II port if the issue persists.
- No Codes Displayed: If the 'Check Engine' light is on but no codes are displayed, verify the vehicle's compatibility (1996 and newer, or select 1994-1995 OBD II compliant). Ensure the connection is secure.
- Difficulty Reading Display: The CP9125 does not feature a backlight. Use adequate external lighting when operating the device in dimly lit areas.
- Codes Cannot Be Erased: If codes cannot be cleared, ensure the ignition is 'ON' (engine off) and that the underlying issue causing the code has been resolved. Some codes may reappear immediately if the fault is still present.
Specifications
- Brand: Actron
- Model: CP9125 C
- Item Weight: 9.9 ounces
- Product Dimensions: 10.3 x 6.3 x 2.3 inches
- Power Source: Corded Electric (via vehicle's OBD II port)
- Voltage: 12 Volts
- Special Features: Includes OBDII 16-pin connector, software with 5,000+ trouble codes, works for most cars and light trucks since 1996.
- Compatibility: All 1996 and newer import/domestic vehicles (OBD II & CAN), select 1994-1995 OBD II compliant vehicles.
Warranty and Support
For information regarding product warranty, technical support, or service, please refer to the documentation included with your purchase or visit the official Actron website. Contact information for customer support can typically be found on the manufacturer's website.





