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Troubleshooting

TQ e-bike troubleshooting: HPR50, HPR60 and HPR120S

Safe checks for TQ drives: what TQ's official HPR50 error code list says to do, overheating and speed sensor warnings, charger rules, app pairing and software updates, and when a TQ dealer is needed.

Last edited Nov 8, 2026 by Pedalwise team Edit History Add a subpage

The Pedalwise team started this page from official manuals, support pages and repair videos. Fixed this yourself, or spotted something wrong? Help improve it.

Battery and electrical safety. Lithium-ion batteries can catch fire if they're damaged or charged wrong. Never open a battery pack, and stop using any battery that's swollen, hot, wet or smells burnt. Every edit to this page is checked by a second person before it goes live.

This page is for e-bikes with a TQ drive: the HPR50, the HPR60 and the HPR120S. Many bike brands use TQ motors, so your bike brand's manual and dealer come first. TQ's official error code list covers the HPR50, and we couldn't find a matching list for the HPR60 or HPR120S on TQ's error code page (TQ error codes). See also our systems overview.

Before you start

  • Find the help for your system. TQ's support page links its manuals, error codes, FAQ, software updates and contact form.
  • Write down the code. TQ codes are four characters, sometimes with WRN in front for a warning. Note the exact code before you restart, so your dealer can look it up (TQ HPR50 error codes).

Common problems and what to check

An error code shows on the display

  • For most faults, TQ's first step is to restart the system. If the code comes back, contact your TQ dealer (TQ HPR50 error codes).
  • For overcurrent, overheating and sensor faults, TQ says to avoid unintended use until the system is checked.
  • TQ's FAQ notes that one code can have different causes (TQ FAQ). See e-bike error codes.

Assist stops on a long climb or a hot day

  • Overheating codes ask you to let the drive unit cool, switching it off if needed, then start again (TQ HPR50 error codes).
  • Battery too hot or too cold codes ask you to let the battery reach room temperature, then restart.
  • See motor cuts out.

Speed sensor warning

Won't charge

  • Use only the TQ charger. TQ's FAQ says its batteries may only be charged with the matching TQ charger, never a third party one (TQ FAQ).
  • An overvoltage code on the battery also points to the charger: swap to an original TQ charger and contact your dealer if needed (TQ HPR50 error codes).
  • For charging port or communication codes, check the charging port for dirt, then restart.
  • See battery won't charge and check your charger.

Battery and charger faults need a TQ dealer. Never open a TQ battery or Range Extender. See e-bike battery care.

Remote or walk assist acts up

  • Don't press the remote buttons while the system starts. If a code says a button was pressed at startup, check the buttons for dirt or sticking and clean them (TQ HPR50 error codes).

App won't connect or show data

  • TQ says to pair the Bluetooth connection between the TQ app and the bike again. Steps differ on iPhone and Android. If that doesn't help, the bike may need a software update (TQ FAQ).

Error codes

These HPR50 codes are from TQ's official list, which has many more (TQ HPR50 error codes). Codes can differ by system and software, so check with your dealer.

  • 0451, 0452, 047F, WRN 0602: drive unit too hot. Let it cool, then restart.
  • 04B0: mechanical fault. Check the chainring for anything stuck in it.
  • 04A8, WRN 0601, WRN 0605: speed sensor. Check the magnet distance, then restart.
  • 04A0, 04A1, WRN 0603: CAN bus. Check the charging port for dirt, then restart.
  • WRN 0604: torque sensor update running. Wait about a minute and don't switch off.
  • 0458: battery overvoltage. Use an original TQ charger.
  • 4409, 440A, 4415: battery voltage very low. Recharge right away.
  • 5402, 5403: remote button pressed at startup. Check and clean the buttons.

For anything that returns after a restart, see your TQ dealer.

Software updates

TQ's update page says the TQ E-Bike app can download software updates for some systems, released in stages, with the HPR60 already listed and the HPR50 still to follow (TQ software updates). TQ's FAQ also says dealers carry out updates, and some outdated battery and Range Extender codes ask you to see a dealer for an update. See update e-bike firmware.

Official help

When to get a pro

  • Any code that returns after a restart, and any overcurrent, sensor or electronics code.
  • Battery and Range Extender hardware or cell codes.
  • Light installs, which TQ says use the Dealer Service Tool in the shop (TQ FAQ).
  • Anything inside the drive unit, battery or wiring.

Leave battery, charger and wiring work to a TQ dealer. See 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

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