Fault Family System: Powertrain (P-Codes) 5 SAE Codes

Throttle System Limp Mode

Diagnostic & Technical Explanation

P2104 (Throttle Actuator Control System - Forced Idle) is a protective-strategy code the ECM sets when it forces idle speed, limited RPM, reduced power, or a shutdown because it has lost confidence in the electronic throttle system, not because this code itself identifies the broken part. The trigger is almost always a separate throttle motor, position sensor, or pedal sensor fault already stored alongside it, so diagnosis starts with the other pending or stored throttle-related codes rather than the throttle body itself.

These 5 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 5 times.

Codes in this family (5)

Code	Definition	Repair coverage
P2104	Throttle Actuator Control System - Forced Idle	3 ranked fixes
P2105	Throttle Actuator Control System - Forced Engine Shutdown	3 ranked fixes
P2106	Throttle Actuator Control System - Forced Limited Power	3 ranked fixes
P210F	Throttle Actuator B Control System - Forced Limited RPM	3 ranked fixes
P2110	Throttle Actuator A Control System - Forced Limited RPM	3 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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