Fault Family System: Powertrain (P-Codes) 15 SAE Codes

EGR Auxiliary Valve Circuit

Diagnostic & Technical Explanation

P213A (EGR Throttle Control Circuit B /Open) covers the control circuits for auxiliary EGR-system valves — a dedicated EGR throttle plate, a vacuum/pressure vent solenoid, or an EGR-C valve on multi-stage systems — that regulate exhaust gas recirculation flow or venting rather than the main EGR valve itself. An open or shorted driver circuit, exhaust soot binding the valve mechanically, and a stuck-open or stuck-closed valve are the failure modes the ECM distinguishes between.

These 15 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 15 times.

Codes in this family (15)

Code	Definition	Repair coverage
P213A	EGR Throttle Control Circuit B /Open	3 ranked fixes
P213B	EGR Throttle Control Circuit B Range/Performance	3 ranked fixes
P213C	EGR Throttle Control Circuit B Low	3 ranked fixes
P213D	EGR Throttle Control Circuit B High	3 ranked fixes
P2143	EGR Vent Control Circuit/Open	3 ranked fixes
P2144	EGR Vent Control Circuit Low	3 ranked fixes
P2145	EGR Vent Control Circuit High	3 ranked fixes
P23E1	EGR C Control Circuit/Open	3 ranked fixes
P23E2	EGR C Control Circuit Performance	3 ranked fixes
P23E3	EGR C Control Circuit Low	3 ranked fixes
P23E4	EGR C Control Circuit High	3 ranked fixes
P23E5	EGR C Control Stuck Open	3 ranked fixes
P23E6	EGR C Control Stuck Closed	3 ranked fixes
P23E7	EGR C Flow Insufficient Detected	3 ranked fixes
P23E8	EGR C Flow Excessive Detected	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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