If your golf cart or electric vehicle uses a Curtis controller and it’s acting up—no power, jerky movement, or blinking codes—you’re in the right place. This guide walks you through common Curtis controller problems and how to fix them quickly and safely.
Important: Many controller issues are linked to weak batteries. Before replacing any electronics, try this DIY battery reconditioning method that restores power and may fix your cart for good.
What Is a Curtis Controller?
The Curtis controller is the “brain” of your electric golf cart or EV. It regulates power to the motor based on throttle input and monitors system safety. Common Curtis models include 1204, 1205, 1268 (SEPEX), and newer AC units. These controllers also provide fault codes through LED flashes or diagnostic tools.
Common Curtis Controller Symptoms
- Cart won’t move or power up
- Solenoid clicks, but no motion
- Jerky acceleration or hesitation
- Controller gets hot quickly
- Blinking LED fault codes
Tools You’ll Need
- Digital multimeter
- Wiring diagram for your specific model
- Basic hand tools
- Optional: Curtis handheld programmer or OEM software
How to Reset a Curtis Controller
- Turn off the key switch
- Set the cart to TOW mode (if equipped)
- Disconnect the battery pack’s main negative cable
- Wait at least 10 minutes to drain power
- Reconnect the cable and set to RUN
- Turn the key on and test
Diagnosing Curtis Controller Fault Codes
Most controllers have an LED that flashes fault codes. Here’s a quick reference chart:
| Flash Code | Description | Fix |
|---|---|---|
| 1-1 | Throttle fault | Check throttle wiring and calibration |
| 1-2 | Battery undervoltage | Recondition or charge batteries |
| 2-1 | Stuck throttle | Release pedal and restart |
| 2-2 | Field wiring open | Check motor field circuit wiring |
| 3-2 | Controller overtemperature | Let cool; check for airflow |
| 4-3 | Battery overvoltage | Check charger setup and battery bank |
| 5-1 | Motor fault | Inspect motor windings and cables |
| 6-1 | EEPROM error | Reset or replace controller |
Top Curtis Controller Troubleshooting Tips
1. Cart Won’t Move
- Verify battery pack is above 36V or 48V (depending on system)
- Check if solenoid clicks when you press the pedal
- If no click, test the key switch, throttle, and solenoid activation wire
2. Solenoid Clicks, But No Movement
- Controller is getting signal but not sending power to motor
- Test controller output pins to motor (A1/A2 or M-)
- Use voltmeter to verify throttle input range (0–5V typical)
3. Jerky Acceleration or Weak Performance
- Throttle sensor may be dirty or out of spec
- Battery pack may sag under load—test voltage drop while accelerating
- Consider reconditioning weak batteries instead of replacing
4. Controller Overheats Quickly
- Blocked airflow or no heat sink contact
- Excess current draw from bad motor or wiring
- Overloaded or poorly programmed controller
How to Test a Curtis Controller
- Turn off key switch and disconnect battery
- Remove wires from motor and controller terminals
- Use a multimeter to check continuity between controller pins
- Reconnect and test throttle signal and output voltage
If the controller passes all tests but still doesn’t function, it may need to be replaced or reprogrammed.
Battery Voltage Reference Table
| Voltage | Battery Condition (48V) |
|---|---|
| 50.9V | 100% charged |
| 48.4V | 75% charged |
| 46.9V | 50% charged |
| 44.0V | Discharged |
When to Replace the Controller
Replace your Curtis controller only if:
- It won’t reset after disconnecting power
- You see fault code 6-1 (EEPROM error)
- Output to motor is zero with valid throttle signal
- You’ve verified all wiring and inputs are correct
Preventive Maintenance Tips
- Keep controller area clean and ventilated
- Check for loose or corroded wires monthly
- Recondition your batteries regularly to maintain performance
Conclusion
Curtis controllers are reliable, but even small issues like low voltage or bad wiring can cause major performance problems. Most of the time, you can fix issues with a simple reset, a voltmeter, and some patience.
Want to restore your cart’s full power without buying a new battery pack? Try this battery reconditioning method today and get your Curtis-powered cart running like new again.
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