Troubleshooting

Gotrax G3, G4, GMAX and GMAX Ultra: error 4 motor signal failure or error 6 motor blocking

Gotrax lists error 4 as a motor signal failure and error 6 as motor blocking on the G3, G4, GMAX and GMAX Ultra. Rule out a jammed wheel and a damaged motor cable; Gotrax's fixes are a new motor, or a controller plus motor.

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Parts

The display on your Gotrax G3, G4, GMAX or GMAX Ultra shows 4 or 6, and the scooter won't drive properly. Gotrax's official error code page lists 4 as a motor signal failure, with a new motor assembly as the fix, and 6 as motor blocking, where the motor suddenly stalls or locks the wheel, with a new controller and motor wheel as the fix (Gotrax error codes). The short answer: check that nothing is physically jamming the wheel and that the motor cable is intact, then go to Gotrax support for the motor or controller.

Motor and controller faults involve high current wiring. Power off before any check, never open the battery or controller, and have a shop do any replacement past the motor wheel itself.

Most likely cause

A motor signal fault means the controller isn't getting the position signals it expects from the motor. On hub motors those signals come from hall sensors, and Grin Technologies' hall sensor testing guide notes that a signal that won't switch points to either the wiring for that sensor or the sensor itself (Grin hall sensor testing guide). Gotrax's own fix for code 4 is a new motor assembly (Gotrax error codes).

For code 6, Gotrax says the stall is usually caused by an electrical or internal fault rather than something physically jamming the wheel, which is why its fix covers both the controller and the motor wheel.

Other causes to rule out

Code 3, MOS failure: Gotrax says a burnt MOSFET in the controller can stop the scooter, make it run at full speed, or trigger codes, and names overloading, water damage and overheating as causes. The fix is a new controller (Gotrax error codes).
Code 1, controller issue: new controller.
Codes 2 and 5: handlebar and brake lever failures, fixed with a new console.
Two code styles on the G4: Gotrax's G4 troubleshooting guide uses codes like E3, E5 and 22E for the G4, while the error code page uses plain numbers. Match the style your display shows. The G4 guide also notes that codes can come from a misplaced wire or a loose bolt.

How to confirm

Power off, wait, power on and note the exact number. Write it down along with what you were doing when it appeared.
With the power off, lift the motor wheel and spin it by hand. It should turn freely. If something is wrapped round the axle or a brake is dragging hard, clear it, though Gotrax says code 6 is rarely a physical jam.
Look along the motor cable where it leaves the axle for cuts, a crushed section, or a cable pulled tight by a loose axle nut.
Think back: a wet ride, a heavy rider on a long hill or a very hot day points toward the controller codes 1 and 3 rather than the motor.
If the code comes straight back, stop riding. A motor that locks the wheel at speed is a crash risk.

Fix options

Clear a jam or reseat a loose wheel (easy)

Only if step 2 found something. Tighten the axle nuts to the spec in your manual and recheck. If the code persists, move on.

Swap in a new motor wheel (moderate)

This is Gotrax's fix for code 4 and half of its fix for code 6. Gotrax's parts page and scooter parts listing don't list motor wheels or controllers for these models, and say to email support for model specific parts. Use the Gotrax support page to check warranty coverage or file a claim before buying anything.

Replace the controller (pro)

For codes 1, 3 and 6, Gotrax's fix includes a new controller. The controller sits in the deck next to the battery wiring, so have a shop fit it.

Repair the motor cable or hall sensors (pro, needs soldering and electrical experience)

A shop can sometimes splice a damaged motor cable or replace hall sensors inside the motor. Grin lists a hall sensor repair guide among its troubleshooting resources. It is worth asking about only when a replacement motor isn't available.

Parts

Motor wheel (through Gotrax support)
Controller (through Gotrax support, shop installed)

When to get a pro

Get help if the wheel locks while riding, the motor cable is damaged, the scooter got wet before the code appeared, or a new motor doesn't clear the code. See motor cuts out, the Gotrax scooter troubleshooting page and when to call a pro.

Sources

Stuck after these checks? Find a shop near you.

Need a pro?

If these steps didn't fix it, find a shop near you in our partner network. For battery or wiring trouble, look for shops marked Battery and electrical.

Talk

Questions, things that worked for you, or something that looks wrong on this page.

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