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Why does my MR55 displaying "No TX found" when I try to read a module?
MR55 not finding TX
Fleetwatch FMS · MR55 Handheld
Why Does My MR55 Say “No TX Found”?
If your MR55 shows No TX Found or TX Not Found when you try to program or read a module, there are two common causes.
🔋 Cause 1 (most common): Low battery
The MR55 battery doesn’t have enough charge to power the MR55 motherboard, display, and TX all at once. The screen may still turn on, but there isn’t enough power left to reach the module.
Fix:
• Charge the removable battery for 30 minutes, or
• Swap in a fully charged battery,
then try again.
📡 Cause 2: Too close to a lane or gate reader
The message can also appear if you’re trying to read the module in a fuel lane, or too close to an FR55 or FR200 reader in a lane or at a gate. Those readers communicate with modules too, which can interfere with the MR55.
Fix:
• Move the vehicle (or yourself) away from the fuel lanes and gate readers, such as into the shop or an open area of the yard, then try again.
Quick Checklist
| ☐ | MR55 battery charged for 30 minutes, or swapped for a charged one |
| ☐ | Not in a fuel lane |
| ☐ | Away from FR55/FR200 readers in the lanes and at gates |
Tip
Keep a spare, fully charged battery with the MR55 so you can swap it on the spot instead of waiting for a recharge.
Still seeing “No TX Found” with a charged battery, away from the lanes? Contact Fleetwatch Support.