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

Throttle Position Sensor G Circuit

Diagnostic & Technical Explanation

P212A (Throttle Position Sensor/Switch G Circuit) covers an additional redundant throttle position sensor channel (labeled G) used on some multi-sensor throttle bodies as a cross-check against the primary position sensors. The ECM distinguishes a missing or out-of-range signal, an intermittent connection, and a signal that fails to track the other channels smoothly, and the sensor element itself or its connector are the parts most often at fault.

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
P212A	Throttle Position Sensor/Switch G Circuit	3 ranked fixes
P212B	Throttle Position Sensor/Switch G Circuit Range/Performance	3 ranked fixes
P212C	Throttle Position Sensor/Switch G Circuit Low	3 ranked fixes
P212D	Throttle Position Sensor/Switch G Circuit High	3 ranked fixes
P212E	Throttle Position Sensor/Switch G Circuit Intermittent	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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