Fault Family
System: Powertrain (P-Codes)
2 SAE Codes
Throttle Actuator Learning Limit
Diagnostic & Technical Explanation
Code P2C99 (Throttle Actuator A Control Exceeded Learning Limit) sets when the electronic throttle body's closed-throttle or full-travel position adaptation, on actuator A or B, hits its calibration limit instead of settling on a valid learned value. A throttle bore fouled with carbon buildup that shifts the true closed position, a worn throttle plate stop, or a throttle motor that cannot reach true closed/full-open are the common causes.
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)