P2447: Secondary Air Injection System Pump Stuck Off Bank 2
What to do
The car drives normally and will fail an emissions test. Ask for the check valve to be replaced alongside any pump — that is what usually destroys the pump, and fitting a new pump without it repeats the failure. Have the relay, fuse and supply checked first, since those are much smaller repairs.
What this code means
The bank 2 secondary air pump is not running when commanded — the last code in the secondary air family.
The reasoning is at P2445, and the point worth carrying away from the whole family is the one it makes: the check valve is the part that fails first and the pump is the part that gets replaced. A new pump fitted behind a failed check valve is destroyed by the same exhaust that killed the last one, and the valve costs a fraction of the pump.
The other thing this family establishes, across P2440 to P2447, is that secondary air is only harmless when it happens at the right moment. Delivered late it corrupts the mixture measurement and makes a healthy engine run rich; not delivered at all it merely costs emissions. That asymmetry is why the stuck-open and stuck-on codes are graded above the stuck-closed and stuck-off ones.
Likely causes
Start here
- Seized secondary air injection pump · moderate
- Failed secondary air check valve · moderate
- Faulty secondary air injection relay · easy
Less common
- Blown fuse or failed supply · easy
- Blocked secondary air pipework · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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