Fault Family
System: Powertrain (P-Codes)
1 SAE Codes
CAC Efficiency Below Threshold
Diagnostic & Technical Explanation
Code P026A (Charge Air Cooler Efficiency Below Threshold) sets when the ECM compares pre- and post-charge air cooler temperatures and finds the cooler is not reducing intake charge temperature enough under boost. Causes are debris-clogged cooling fins, a bent/collapsed core restricting airflow, or an internal leak reducing charge flow through the core.
These 1 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 1 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)