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Ridstar Q20 Error Code Guide: Fixes & Troubleshooting
Is your Ridstar Q20 showing a mysterious “E” on the display? Don’t panic. Use this expert guide to identify the Ridstar eBike fault and perform the right fix to restore your Ridstar electric bike’s performance.
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Ridstar Q20 Error Code List & Meanings
Common Ridstar Q20 Error Codes (Decimal)
| Code | Meaning | Likely Cause |
|---|---|---|
| 0 | Normal | System working correctly |
| 2 | Brake error | Brake sensor stuck or damaged |
| 6 | Battery undervoltage | Ridstar Q20 Battery voltage low |
| 7 | Motor failure | Ridstar Motor or cable connector issue |
| 8 | Throttle malfunction | Ridstar Q20 throttle wiring or sensor |
| 9 | Controller failure | Ridstar Controller internal fault |
| 10 | Communication receive error | Ridstar Display → controller signal lost |
| 11 | Communication send error | Ridstar Q20 controller → display signal lost |
| 12 | BMS communication failure | Battery BMS connection issue |
| 13 | Headlight failure | Headlight or wiring issue |
Advanced Ridstar Q20 Error Codes (5S Protocol)
| Error Code | Meaning |
|---|---|
| 30 | Communication anomaly |
| 33 | Current anomaly |
| 34 | Throttle anomaly |
| 35 | Ridstar q20 motor phase loss |
| 36 | Ridstar Hub Motor Hall sensor fault |
| 37 | Brake anomaly |
These errors usually indicate electrical or sensor-level faults that require inspection of wiring or component replacement
Common Ridstar Q20 Error Codes & Solutions
The Ridstar Q20, Ridstar q20 Pro and Ridstar Q20 1500w typically utilizes the LCD-M5 control panel. When a component like the hub motor q20 fails, a status code is triggered. Below are the most frequent error codes encountered by riders and the step-by-step procedures to fix them.
Error 06: Battery Undervoltage
– Your battery is too low to operate. Charge immediately.
Error 07 (or 35/36): Motor & Hall Sensor Failure
What it means: The system has detected a motor failure or a Motor Hall anomaly. This usually indicates that the controller cannot communicate with the rear hub motor.
How to Fix:
Check the Motor Plug: Trace the thick black cable from the rear motor to the waterproof connector near the frame. Ensure it is pushed in fully so the alignment arrows meet.
Inspect for Pinches: Check the wire for any cuts or splits, especially where it exits the axle.
Phase Deficiency (Code 35): If you see code 35, a motor phase wire is disconnected or damaged.
Error 08 (or 34): Throttle / Turn Malfunction
What it means: The throttle (turn handle) is malfunctioning or showing an anomaly. This often happens if the throttle is held down while the bike is being turned on.
How to Fix:
The Hands-Off Check: Turn the bike off, ensure the throttle is in the neutral position, and turn it back on.
Check the Wiring: Unplug and replug the throttle connector to ensure a solid connection.
Physical Jam: Ensure the grip isn’t rubbing against the throttle housing, preventing it from snapping back.
Error 09: Controller Failure
What it means: The main “brain” of the bike—the controller—has suffered a hardware failure.
How to Fix:
Hard Reset: Power down the bike and remove the battery for 5 minutes.
Internal Inspection: Check the wiring inside the controller compartment for any burnt smells or loose pins. If the error persists, the controller likely needs replacement.
Error 10: Communication Reception Failure
What it means: The display is not receiving data from the controller.
How to Fix:
Check the 5-Pin Connector: Inspect the main cable connecting the M5 display to the harness. Ensure no pins are bent or green from moisture.
Battery Voltage: Ensure the battery is fully seated, as low voltage can sometimes cause communication drops.
Error 2 (or 37): Brake Anomaly
What it means: A brake sensor is stuck.
How to Fix:
Check if brake levers are fully released
Inspect brake sensor wires for damage
Disconnect brake sensors temporarily to test
Replace faulty brake lever if needed
M5 Display P-Settings
The Ridstar e bike P-Settings menu allows you to customize the bike’s behavior. To enter the settings, long-press the Up and Down buttons simultaneously.
| Setting | Function | Options / Explanation |
| P01 | Backlight Brightness | Level 1 (Darkest) to Level 3 (Brightest). |
| P02 | Mileage Unit | 0 for Kilometers (KM); 1 for Miles (MILE). |
| P03 | Voltage Level | 24V, 36V, 48V, 60V, 64V (Default is 36V). |
| P08 | Speed Limit | Set 0–100. 100 = No Speed Limit (Unlocked). |
| P09 | Start Mode | 0: Zero Start (Instant); 1: Non-Zero Start (Kick-off). |
| P10 | Drive Mode | 0: Pedal Assist only; 1: Electric only; 2: Both Coexist. |
| P16 | ODO Reset | Long-press the “Up” button for 5 seconds to clear total mileage. |
RIDSTAR Q 20 FAQ
Q: How do I turn on the headlights?
A: Long-press the Up (+) button while the bike is on to toggle the lights.
Q: My bike is stuck at 15 MPH. How do I fix it?
A: Enter the settings and go to P08. Increase the value to 100 to remove the software speed cap.
Q: How do I enable Cruise Control?
A: Go to setting P17. Set it to “1” to enable cruising. You can also enter a 6KM/h “Walk Mode” by long-pressing the Down (-) button while the bike is stationary.
Q: What do I do if I see Error 10?
A: This is a communication error. Unplug the main display connector (the circular one near the handlebars), check for moisture or bent pins, and plug it back in firmly.
How to cut the speed limiter of Ridstar Q20?
The “limiter” is managed electronically. You do not need to cut physical wires. Simply enter the settings menu, navigate to P08, and change the value to 100. This allows the ridstar q20 motor to reach its true top speed.
How fast does the Ridstar Q20 go?
Standard Q20 (1500W Peak): Reaches 30–33 MPH once unlocked.
Q20 Pro (2000W Peak): Can achieve top speeds of 35–37 MPH.
Q20 Lite (1000W Peak): Generally tops out at 25–30 MPH.
Is the Ridstar Q20 street legal?
In the USA, it is often classified as a Class 2 or Class 3 e-bike depending on local laws and if the speed is limited to 20–28 MPH. In the UK and EU, because the hub motor q20 exceeds 250W and allows throttle use over 15.5 MPH, it may be classified as a moped requiring registration, license, and insurance.
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This is a really useful guide. Error codes can be confusing, so I like how you broke down what each code likely means and what to check first before replacing parts. The step-by-step troubleshooting approach is great, especially for beginners who just want to get the bike running again safely.