Is your golf cart acting up with an Alltrax controller? Whether it’s blinking codes, not moving, or suddenly losing power, this guide will help you diagnose and fix the most common Alltrax controller problems step by step.
Battery voltage looking low? Before replacing your pack, try reconditioning your golf cart batteries at home. It’s easy, works with most lead-acid batteries, and can save you hundreds.
What Is an Alltrax Controller?
Alltrax makes high-performance programmable controllers used in many golf carts, including Club Car, EZGO, Yamaha, and custom builds. Common models include:
- Alltrax XCT (for Series, SepEx, and IQ systems)
- Alltrax SR (for series motors)
- Alltrax AXE (older version for DC motors)
They’re reliable and powerful—but when problems arise, you’ll often see blinking LED codes or performance issues.
1. Cart Won’t Move
If your cart doesn’t move when pressing the pedal:
- Check voltage: The controller needs a minimum pack voltage to operate (usually 36V or 48V depending on the model).
- Run/tow switch: Make sure the cart is in RUN mode.
- Solenoid click: Listen for a click when the pedal is pressed. No click = no signal or faulty solenoid.
Fix: Test the solenoid, verify voltage at the controller input, and ensure throttle input is connected. If batteries are low, recondition them instead of replacing.
2. Alltrax LED Blinking Fault Codes
The Alltrax controller has a status LED light that flashes in a specific pattern. Count the number of blinks and refer to this table:
| Blink Code | Description | What to Check |
|---|---|---|
| 2 Green, 1 Red | Throttle Fault | Throttle disconnected or out of range |
| 2 Green, 2 Red | Overvoltage | Battery pack exceeds max voltage (check charger) |
| 2 Green, 3 Red | Throttle High | Pedal not at zero during startup |
| 2 Green, 4 Red | Controller Overheat | Let it cool down; check for airflow |
| 2 Green, 5 Red | Precharge Failure | Check resistor and wiring to solenoid |
3. Cart Moves, Then Cuts Out
If your golf cart starts moving then suddenly stops:
- Thermal overload: Controller overheats after heavy load.
- Loose motor cables: Vibration can disconnect motor wires.
- Throttle miscalibration: Sudden pedal dropouts from incorrect sensor reading.
Fix: Check controller temperature, secure all connections, and recalibrate throttle via Alltrax Toolkit software.
4. Using the Alltrax Toolkit Software
The free Alltrax Toolkit lets you:
- Monitor throttle position and motor current in real-time
- Check and clear fault codes
- Adjust speed, acceleration, braking, and more
Steps:
- Connect your laptop to the controller using a USB-to-serial cable
- Open the Alltrax Toolkit software
- Review system status and logs
- Modify settings if needed and save to controller
5. Troubleshooting Throttle Problems
Alltrax supports several throttle types: ITS (EZGO), MCOR (Club Car), 0-5kΩ, 5k-0Ω, and 0-5V. If your cart isn’t responding well to the pedal:
- Test throttle voltage range using Toolkit or multimeter
- Replace throttle sensor if out of spec
- Check for loose connectors or broken wires at the pedal box
Most throttle faults are due to loose wiring or sensors wearing out over time.
6. Battery Voltage Issues
Alltrax controllers rely on steady battery voltage for operation:
- Low voltage = no start or weak acceleration
- Overvoltage = shutdown to protect components
- Uneven batteries = controller confusion
Fix: Use a voltmeter to test each battery. If one is underperforming, recondition it instead of replacing. This can help restore lost range and power.
7. Resetting an Alltrax Controller
To perform a soft reset:
- Turn off the key switch
- Put the cart in TOW mode
- Disconnect the main battery negative cable
- Wait 3–5 minutes
- Reconnect the cable and return to RUN mode
This clears most temporary errors and resets the controller’s state.
When to Replace Your Alltrax Controller
Consider replacing the controller if:
- It shows no LED light at all (dead)
- Constant fault codes that return after reset
- It doesn’t respond to the Toolkit software
Before replacing: Make sure it’s not a battery problem. Weak batteries can cause false controller errors. Try reviving them first using a reliable battery reconditioning course.
Conclusion
Alltrax controllers are tough and highly customizable, but they’re still vulnerable to voltage drops, heat, and wiring issues. With some simple tools and the Alltrax Toolkit, you can troubleshoot and fix most issues on your own.
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