Fault Family System: Powertrain (P-Codes) 18 SAE Codes

Exhaust Heat Exchanger Bypass Valve

Diagnostic & Technical Explanation

Code P00E3 (Exhaust Heat Exchanger Exhaust Bypass Valve A Stuck Open) sets when the ECM commands the exhaust heat exchanger bypass valve (used to speed coolant warm-up) and detects it has not moved from its open or closed position. Causes are carbon buildup seizing the valve flap, a failed actuator, or linkage corrosion.

These 18 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 18 times.

Codes in this family (18)

Code	Definition	Repair coverage
P00E3	Exhaust Heat Exchanger Exhaust Bypass Valve A Stuck Open	3 ranked fixes
P00E4	Exhaust Heat Exchanger Exhaust Bypass Valve A Stuck Closed	3 ranked fixes
P237C	Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit/Open	3 ranked fixes
P237D	Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit Low	3 ranked fixes
P237E	Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit High	3 ranked fixes
P237F	Exhaust Heat Exchanger Exhaust Bypass Valve A Control Performance	3 ranked fixes
P23A2	Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit/Open	3 ranked fixes
P23A3	Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit Low	3 ranked fixes
P23A4	Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit High	3 ranked fixes
P23A5	Exhaust Heat Exchanger Exhaust Bypass Valve B Control Performance	3 ranked fixes
P23A6	Exhaust Heat Exchanger Exhaust Bypass Valve B Stuck Open	3 ranked fixes
P23A7	Exhaust Heat Exchanger Exhaust Bypass Valve B Stuck Closed	3 ranked fixes
P23A8	Exhaust Heat Exchanger Exhaust Bypass Valve B Position Sensor Stop Performance	3 ranked fixes
P25D6	Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Stop Performance	3 ranked fixes
P2C22	Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Circuit	3 ranked fixes
P2C23	Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Performance	3 ranked fixes
P2C24	Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Circuit Low	3 ranked fixes
P2C25	Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Circuit High	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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