Why won't my RC car turn on?

Usually a flat or half-connected battery, so charge the pack and seat the connector firmly. If there's no life with a known-good pack, check the on/off switch and wiring, and stop immediately if you smell burning - that points to a short or a failed speed controller.

My RC car powers on but won't move - what's wrong?

Check the transmitter is bound and the speed controller (ESC) is armed at neutral throttle, then calibrate the ESC's throttle range. If the motor whines but the wheels don't turn, you've likely stripped the spur gear, loosened the pinion, or dropped a driveshaft.

Why won't my RC car bind to the transmitter?

Fit fresh transmitter batteries, select the correct model memory, and run the bind procedure until the receiver LED goes solid - keeping the transmitter and receiver about 30cm apart. A crash-damaged or water-soaked receiver can fail to bind and may need replacing.

Why does my RC car cut out after a minute?

If power fades and returns once it cools, the ESC or motor is hitting its thermal cut-off - gear down and improve airflow. If it dies and only restarts after a battery change, that's the low-voltage cut-off protecting the LiPo, so recharge and check the cells.

Why is my RC car steering off-centre?

Centre the steering trim first, then re-fit the servo horn one spline at a time and check the servo saver hasn't slipped. Set front toe with the wheels for a straight run.

My LiPo battery is puffed - what do I do?

Stop using it - do not charge or discharge a puffed, swollen or hot LiPo. Move it somewhere fireproof such as a LiPo safety bag or metal tin and dispose of it through battery recycling; never put it in household waste.

RC Car Troubleshooting Tool | Radio-Controlled.co.uk

Common RC car problems — and how to fix them

A quick reference to the setup and running faults we see most often on electric RC cars, trucks and buggies. Use the diagnostic tool above to be walked through your exact symptom step by step.

RC car won't turn on

Totally dead when you flick the switch — no lights or beeps.

Charge the pack fully and push the connector fully home.
Check for reversed polarity, pinched wires or a failed on/off switch.
A burning smell means a short — disconnect immediately.

Powers on but won't move

Electronics are live but pulling the trigger does nothing, or the motor just whines.

Make sure the radio is bound and the ESC armed at neutral throttle.
Calibrate the ESC throttle range (neutral, full throttle, full brake).
A whine with no drive = stripped spur gear, loose pinion or a dropped driveshaft.

No response to the transmitter

The car powers up but ignores the sticks, or only one channel works.

Fit fresh transmitter batteries and select the correct model memory.
Re-bind the receiver until its LED is solid.
One dead channel: swap the servo plugs to isolate a lead, device or receiver port.

Steering problems

Off-centre, pulls one way, twitchy, or limited lock.

Centre the trim, then re-fit the servo horn one spline at a time.
Twitching is usually low receiver voltage or interference, not the servo.
Set steering endpoints so the servo doesn't strain (buzz) at full lock.

Grinding, slipping or vibration

Nasty drivetrain noises, slip under power, or shaking at speed.

Reset the gear mesh with a slip of paper's backlash; replace stripped gears.
Slipping under power: adjust the slipper clutch or check the diffs.
Vibration at speed: tighten wheel nuts, check for a bent driveshaft or unglued tyre.

Overheats or cuts out mid-run

Power fades after a minute, or parts are too hot to hold.

Fading power that returns after cooling = thermal cut-off; gear down and improve cooling.
Cuts out until a battery swap = LiPo low-voltage cut-off; recharge and check cells.
Keep motor and ESC under about 70-80C.

Glitching or loses signal

Random twitches, or control drops out at a distance.

Range loss: fresh transmitter batteries and route the antenna up its tube.
Twitching up close: a weak BEC/pack browning out, or electrical noise.
Separate the receiver and antenna from the motor and power wires.

Battery and charging

Won't charge, short runtime, gets hot, or looks swollen.

A puffed or swollen LiPo is a fire risk - stop, isolate and recycle it safely.
Won't charge: set the right chemistry/cell count and plug in the balance lead.
Short runtime: check capacity, gearing, age and that it reached full charge.

Handling and setup

It drives, but it won't corner, traction-rolls, or feels bouncy.

Understeer: grippier front tyres, thinner front diff oil, a touch of front toe-out.
Traction roll: lower the ride height and centre of gravity; add sway bars.
Change one thing at a time and test between each.