Seven controller failure symptoms, how to test output with a multimeter, and replacement options for TXT (Curtis/Alltrax) and RXV controllers.
Controllers are the most expensive component in the drivetrain ($200–$700). Do not replace one until you've confirmed: (1) battery voltage is correct, (2) solenoid is closing, and (3) the controller is receiving input signal from the ITS/throttle. If all three are true and the motor gets no power, the controller is likely failed.
Probe M terminal during pedal press. Zero volts with solenoid closed = controller failure.
Throttle sensor (ITS) issue or speed sensor feedback fault. Test ITS resistance before replacing controller.
Controller gets hot to touch within 5 min. Could be internal fault or excessive current from locked motor.
Note the LED blink pattern on the dash before any work. Codes isolate the fault without guessing.
The solenoid clicks (confirmed by continuity test on large posts) but the cart doesn't move. Set multimeter to DC voltage. Probe the B+ terminal and the M (motor) terminal on the controller while a helper presses the pedal. A working controller will ramp voltage from 0 to near pack voltage as the pedal is depressed. Zero volts at M with pack voltage at B+ and solenoid closed = failed controller.
Cart moves but lurches, surges, or has a dead zone in the throttle. Usually this is the Inductive Throttle Sensor (ITS) rather than the controller itself. The ITS is the sensor mounted on the pedal assembly. Test it: set multimeter to resistance (ohms) and probe the ITS terminals while slowly pressing the pedal. Resistance should rise smoothly from ~0 to 5k ohms. If it jumps or has a gap, replace the ITS ($25–$60) before buying a controller.
Cart runs normally then cuts out under load (climbing a hill or starting from rest). This can be a controller thermal shutdown (overheating), a battery voltage sag below the low-voltage cutoff, or a loose B+ connection to the controller. Check all controller terminal bolts first — a loose B+ terminal causes intermittent cutout and can arc, burning the terminal lug.
Cart launches at full speed when the pedal is barely touched. This indicates the ITS or the controller's internal throttle circuit has failed open-high. Test the ITS first. If ITS is good, the controller's throttle input stage is failed.
A burning electronics smell (distinct from battery off-gassing, which smells like sulfur) means the controller is internally arcing or a MOSFET has failed. At this point the controller is almost certainly beyond repair. Continued operation risks motor damage.
For the EZGO TXT, Curtis and Alltrax are the two most common controller brands. Alltrax is popular because it offers programmable parameters (max speed, throttle curve) and is highly reliable. Curtis controllers are OEM and widely available used. For the RXV, the controller is proprietary — you're looking at OEM replacement or a rebuild service.
| Controller Option | Cost | Notes |
|---|---|---|
| Curtis 1206 (TXT 48V) | $200–$350 | OEM-spec, direct swap |
| Alltrax AXE (TXT 48V) | $280–$450 | Programmable, popular upgrade |
| RXV controller (OEM) | $400–$700 | Proprietary; dealer or rebuild service |
| ITS throttle sensor | $25–$60 | Test this before replacing controller |
Programmable replacement controller for EZGO TXT 48V. Popular upgrade over OEM Curtis units.
Check Price on Amazon → As an Amazon Associate, CartFix earns from qualifying purchases.Inductive Throttle Sensor for EZGO TXT. Test this before replacing your controller — it causes most throttle symptoms.
Check Price on Amazon → As an Amazon Associate, CartFix earns from qualifying purchases.