Fault Family System: Powertrain (P-Codes) 10 SAE Codes

Wastegate Position Sensor Circuit

Diagnostic & Technical Explanation

Code P2AB7 (Wastegate Position Sensor A Circuit) covers the dedicated position sensor that reports actual wastegate flap angle back to the ECM, separate from the boost control solenoid or actuator that moves it. The ECM flags an open, shorted, out-of-range, or learning-limit-exceeded signal on wastegate A or B. Causes are a worn sensor element from constant exhaust heat cycling, deposits shifting the wastegate's actual travel away from its learned stops, or a corroded connector at the actuator housing.

These 10 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 10 times.

Codes in this family (10)

Code	Definition	Repair coverage
P2AB7	Wastegate Position Sensor A Circuit	4 ranked fixes
P2AB8	Wastegate Position Sensor A Circuit Low	4 ranked fixes
P2AB9	Wastegate Position Sensor A Circuit High	4 ranked fixes
P2ABA	Wastegate Position Sensor B Circuit	4 ranked fixes
P2ABB	Wastegate Position Sensor B Circuit Low	4 ranked fixes
P2ABC	Wastegate Position Sensor B Circuit High	4 ranked fixes
P2B81	Wastegate Position Sensor A Circuit Performance	4 ranked fixes
P2B82	Wastegate Position Sensor B Circuit Performance	4 ranked fixes
P2B93	Wastegate Position Sensor A Exceeded Learning Limit	4 ranked fixes
P2B94	Wastegate Position Sensor B Exceeded Learning Limit	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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