SPN 84 is a diagnostic trouble code for wheel based vehicle speed data erratic.
FMI 2 – Intermittent Or Incorrect
FMI 9 – Abnormal Update Rate
FMI 10 -Abnormal Rate Of Change
FMI 19 – Received Network Data In Error
Troubleshooting:
Verify (ECM) electronic control module calibration
Clean (VSS) vehicle speed sensor connections
Other SPN codes:
- SPN 4334 FMI [2-18]
- SPN 3264 FMI [0-16]
- SPN 3226 FMI [2-20]
- SPN 729 MFI [3,4,5]
- SPN 639 FMI [2-19]
- SPN 111 [FMI 1 – 18]
- SPN 103 FMI [2,15,16,18]
- SPN 91 FMI [2-19]
- SPN 84 FMI [2,9,10,19]
- SPN 101 FMI [0 – 16]
- SPN 3058 FMI[10,16,18]
- SPN 641 FMI [7 – 31]
- SPN 1761 FMI[1 – 18]
- SPN 190 FMI [0, 2, 16]
- SPN 3216 FMI 20
- SPN 5246 FMI 0
