SPN 1761 — Aftertreatment 1 DEF Tank Volume
System: Aftertreatment / DEF
How full the diesel exhaust fluid (DEF) tank is.
Can I keep running it?
MEDIUM — fix soon
Running low on DEF leads to inducement derates and eventually a speed limit. Fill up.
Likely causes
- Low DEF level
- Frozen DEF
- Faulty level sensor (often combined with temperature/quality sensor)
- Wiring fault
Checks & fixes (easiest first)
- Fill the tank with fresh, certified DEF
- Check the tank sender for crystal buildup
- Compare gauge with a visual check
Common FMIs with SPN 1761
- SPN 1761 FMI 1Value too low (most severe)
- SPN 1761 FMI 2Data erratic, intermittent, or incorrect
- SPN 1761 FMI 3Voltage above normal or shorted high
- SPN 1761 FMI 4Voltage below normal or shorted low
- SPN 1761 FMI 17Value too low (least severe)
- SPN 1761 FMI 18Value too low (moderately severe)
Related codes
FAQ
What does SPN 1761 mean?
SPN 1761 is Aftertreatment 1 DEF Tank Volume. How full the diesel exhaust fluid (DEF) tank is.
Can I keep running with SPN 1761?
Running low on DEF leads to inducement derates and eventually a speed limit. Fill up.
What causes SPN 1761?
Low DEF level; Frozen DEF; Faulty level sensor (often combined with temperature/quality sensor); Wiring fault.