Fault Family
System: Powertrain (P-Codes)
2 SAE Codes
EGR Cooler Efficiency
Diagnostic & Technical Explanation
Code P241F (EGR Cooler B Efficiency Below Threshold) sets when the ECM compares gas temperature before and after the EGR cooler and finds too little temperature drop across it, meaning the cooler is no longer removing enough heat from recirculated exhaust gas. Causes are internal cooler tube fouling from soot and condensed hydrocarbons, a cracked cooler core letting coolant and exhaust gas cross-contaminate, or a stuck-open bypass valve routing gas around the cooler element.
These 2 diagnostic trouble codes share one
detection mechanism and one repair path, which is why MechanicDB groups them into a single
authored fault family rather than repeating the same explanation 2 times.
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)