OBD-II Generic Error Code P2257: How to Fix It

Q: Can I drive my car with a P2257 code?

Yes, in most cases P2257 will not leave you stranded or cause immediate mechanical damage, and your vehicle will likely drive normally. However, the check engine light will be on, and your vehicle will almost certainly fail an emissions inspection. The secondary air injection system is critical for reducing cold-start emissions, and a failing system can over time increase exhaust back-pressure or strain the catalytic converter. It is best to diagnose and repair P2257 promptly rather than ignoring it.

Q: What is the most common cause of P2257?

The most common causes of P2257 are a failed or failing secondary air injection pump, a faulty SAI relay, or wiring and connector issues in the SAI control circuit (such as corrosion, broken wires, or poor grounds). In colder climates, moisture intrusion into the pump or check valves is also a frequent culprit. A blown fuse protecting the SAI system is often the quickest and easiest fix to check first.

Q: How much does it cost to fix P2257?

Repair costs vary widely by vehicle and cause. Replacing a fuse or relay is typically under $20 in parts. Repairing damaged wiring or connectors may cost $50–$200 in parts and labor. A replacement secondary air injection pump typically costs $80–$300 for the part alone, with $100–$250 in labor, putting total repair cost at $200–$550. Check valves are usually inexpensive ($20–$80 each). ECM-related repairs can run $300–$1,500 or more depending on whether reprogramming or full replacement is required.

Q: Will P2257 cause my car to fail an emissions test?

Yes. P2257 directly relates to the secondary air injection system, which is a regulated emission control system. An active P2257 code will illuminate the check engine light, and virtually all U.S. states and many countries will automatically fail a vehicle with an illuminated check engine light during an emissions or smog inspection. You must resolve the fault and confirm the readiness monitors have completed a full drive cycle before attempting an emissions test.

Q: Is P2257 the same as P2258 or P0410?

Not exactly — they are related but distinct codes. P2257 specifically refers to a low control circuit signal for the secondary air injection system (circuit A). P2258 is the corresponding high circuit code for the same circuit. P0410 is a broader code that indicates a general malfunction detected in secondary air injection system performance, often triggered when the ECM does not see the expected increase in oxygen sensor readings when the pump activates. It is common to see these codes appear together, and diagnosing P2257 first (as a circuit-level fault) will often resolve P0410 as well.

Abstract

Error code P2257 indicates that your vehicle's Engine Control Module (ECM) has detected a low voltage or current signal in the secondary air injection (SAI) control circuit. The secondary air injection system pumps fresh air into the exhaust stream during cold starts to reduce harmful emissions and help the catalytic converter reach operating temperature faster. When this circuit reads lower than expected, the ECM triggers P2257, which can cause your vehicle to fail emissions testing and may indicate a failing pump, relay, wiring fault, or control module issue.