What the 0x000038 alarm means

The controller lost its bus link to one or more joint modules; the robot is stopped until the link recovers. This is one of the faults our repair team handles on JAKA Zu / JAKA Pro cobots (APP) systems — the cause is usually identifiable within the first on-site inspection.

Most common causes

  • Bus cable or slip-ring wear in the base
  • Joint module power dip
  • Connector oxidation or looseness
  • EMI on the internal bus
Field note: the first item on this list is what we find most often on real machines. Check it before you go deeper.

Step-by-step field fix

  1. Power-cycle and note whether the same joint drops out
  2. Inspect external cables and connectors
  3. Check for sources of interference near the cell
  4. Update controller and joint firmware to matched versions
  5. Replace the cable or joint module if the dropout repeats
Safety first: never bypass safety circuits or force contactors closed. If the alarm involves E-stop chains, brakes or drive power, and you are not a trained robot technician, contact a professional — wrong moves here can cost you a robot or an injury.

Still stuck? Get an engineer on the phone — right now

Tell us the alarm code, the robot model and what was happening when the alarm came up. Our engineers run these diagnostics every day, and remote diagnosis by phone or video call is free.

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Hotline: +86-20-39029800 · WhatsApp: +86-188-1886-2860

Related Communication alarms

0x000030 — Controller Temperature Too High 0x000031 — Bus Voltage Abnormal 0x000032 — Motor Overcurrent 0x000033 — Encoder Fault 0x000034 — Motor Overtemperature 0x000035 — Collision Detected
Other brands: we also keep field-fix libraries for AUBO · ROKAE · Dobot and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the JAKA 0x000038 alarm mean?

The controller lost its bus link to one or more joint modules; the robot is stopped until the link recovers. In field practice it belongs to the communication family of faults.

QCan I clear a JAKA 0x000038 alarm myself?

Sometimes. Work through the step-by-step checks on this page — the first listed cause is what we find most often in the field. If the alarm returns after two attempts, or the fault involves power, brakes or safety circuits, stop and call a qualified robot service engineer.

QHow fast can a Henghuan engineer help?

On-site response in the Pearl River Delta within 30 minutes to 3 hours, across mainland China in 1-3 business days, and worldwide within 2-5 business days. Remote diagnosis by phone/WhatsApp/video is available immediately.

Written by the Henghuan Robotics repair team from field service experience. Alarm descriptions are our own summary for troubleshooting reference and may vary by controller and software version — when in doubt, check your JAKA documentation or contact us. Henghuan is an independent service provider, not affiliated with or endorsed by JAKA.