System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Reductant Tank Cap Switch
Code P24CC: Reductant Tank Cap Switch Circuit Range/Performance
Diagnostic & Technical Explanation
Code P24CC (Reductant Tank Cap Switch Circuit Range/Performance) sets when the ECM sees an open, shorted, out-of-range, or intermittent signal from the switch in the diesel exhaust fluid tank filler cap that confirms the cap is properly closed to keep contaminants and moisture out of the reductant supply. Causes are a cracked cap seal that no longer closes the internal contact, DEF crystallization corroding the cap's contacts, or chafed wiring in the filler-neck harness.
First-listed procedure
Rank #1
Clean DEF cap switch crystal residue
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 2 procedure(s) are in the licensed dataset. Ordering context.
Full family: Reductant Tank Cap Switch
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)