Fault Family System: Powertrain (P-Codes) 6 SAE Codes

Throttle Actuator Control Performance

Diagnostic & Technical Explanation

Code P0510 (Closed Throttle Position Switch) sets when the electronic throttle body's actual blade position does not track the ECM's commanded position within tolerance, when the throttle input signal is missing during auto-configuration, or when a closed throttle position switch fails to confirm idle position. Typical causes are a carbon-fouled throttle bore causing binding, a worn throttle motor or position sensor, or a maladjusted/failed closed-throttle switch on older drive-by-cable-with-switch designs.

These 6 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 6 times.

Codes in this family (6)

Code	Definition	Repair coverage
P0510	Closed Throttle Position Switch	4 ranked fixes
P0638	Throttle Actuator Control Range/Performance Bank 1	4 ranked fixes
P0639	Throttle Actuator Control Range/Performance Bank 2	4 ranked fixes
P063E	Auto Configuration Throttle Input Not Present Bank 1	4 ranked fixes
P069F	Throttle Actuator Control Lamp Control Circuit	4 ranked fixes
P26FF	Auto Configuration Throttle Input Not Present Bank 2	4 ranked fixes

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)

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