P2275

Secondary Air Injection System Air Flow/Pressure Sensor Circuit High Bank 2

P2275 is a generic OBD-II powertrain diagnostic trouble code: Secondary Air Injection System Air Flow/Pressure Sensor Circuit High Bank 2. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P2275
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
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What P2275 means

P2275 is the high-side counterpart to P2274. It is stored when the PCM sees a higher-than-expected voltage or frequency from the secondary air injection flow or pressure sensor on Bank 2. The SAI system is designed to inject fresh air into the exhaust manifold during cold start, accelerating catalyst light-off and reducing cold-start pollutants.

A high circuit signal typically indicates a short to voltage on the signal wire, a failed sensor with a high output, an open in the sensor ground circuit causing the signal to float high, or an actual airflow condition that is genuinely above the sensor calibrated maximum. The ECM cannot confirm proper SAI operation when the sensor is out of range, so the MIL is triggered and the SAI readiness monitor will report incomplete or failed.

Diagnosis should mirror the low-side procedure: inspect wiring for shorts to voltage, verify sensor ground integrity, and measure sensor output voltage. If wiring is intact and supply/ground voltages are correct, the sensor element has likely failed high. As with P2274, address any companion codes for the SAI pump or relay first, as an overdriven pump could produce a genuinely high pressure reading in a restricted circuit.

Common causes

Most-frequently reported root causes when P2275 is logged.

  • 1
    Short to battery voltage on the SAI sensor signal wire for Bank 2.
  • 2
    Open in the sensor ground circuit causing the signal line to float high.
  • 3
    Failed SAI flow or pressure sensor with a high output fault.
  • 4
    Corrosion or moisture intrusion in the Bank 2 sensor connector.
  • 5
    Blocked SAI outlet (check valve stuck closed) creating abnormally high back-pressure.
  • 6
    Incorrect replacement sensor installed with a non-matching calibration.
  • 7
    PCM input circuit fault.

Symptoms drivers notice

MIL illuminated during or after cold start.
SAI readiness monitor incomplete or failed on scan tool.
Elevated cold-start hydrocarbon and CO emissions.
Possible SAI pump running continuously if ECM cannot confirm adequate flow.

How to diagnose P2275

A typical diagnostic flow when this code is present.

  1. 1
    Scan and record all DTCs; check for companion SAI pump, relay, or check valve codes.
  2. 2
    Inspect Bank 2 SAI sensor wiring for shorts to voltage, corrosion, or connector damage.
  3. 3
    Verify sensor ground integrity: measure resistance from sensor ground pin to chassis ground.
  4. 4
    Measure sensor signal voltage with key on, engine off, and compare to service specification.
  5. 5
    Inspect the Bank 2 SAI check valve and outlet pipe for blockage or restriction.
  6. 6
    If circuit checks are normal, replace the Bank 2 SAI flow/pressure sensor.
  7. 7
    Clear codes and perform a cold-start drive cycle to confirm the monitor runs and passes.

Related powertrain codes

Frequently asked questions

Can a stuck-closed SAI check valve cause P2275?

Yes. If the check valve is stuck closed, back-pressure can build in the SAI circuit, potentially driving the pressure sensor reading above its expected range.

Is P2275 more serious than P2274?

Both are sensor circuit faults with similar implications. Neither directly disables the SAI pump, but both prevent the ECM from verifying SAI performance and will trigger the MIL.

Will clearing P2275 make it go away permanently?

Only if the underlying wiring or sensor fault is repaired first. The code will reset on the next cold-start monitoring cycle if the root cause remains.

Can P2275 coexist with P2274?

Not on the same bank simultaneously; they are mutually exclusive high/low faults. However, P2274 on Bank 2 and a high-side fault on a separate bank or circuit can coexist.

Disabling P2275 in software

RaceTune can permanently disable P2275 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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