Error code
OBD2 P2438
OBD2P2438
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Secondary Air Injection System Air Flow/Pressure Sensor Circuit High.
Severity
moderateCan drive but may experience reduced performance and increased emissions.
Summary
P2438 indicates an issue with the air flow/pressure sensor in the secondary air injection system on bank 2, specifically that the circuit is reading too high.
Common Causes
- Wiring short to positive
Fixes
- Replace the air flow/pressure sensor.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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- P2403Evaporative Emission System Leak Detection Pump Sense Circuit/Open
- P2404Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance
- P2405Evaporative Emission System Leak Detection Pump Sense Circuit Low
- P2406Evaporative Emission System Leak Detection Pump Sense Circuit High
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