Secondary Air Injection System Pump Relay Control Circuit Open
The secondary air injection pump relay circuit is open or faulty.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer expected to see a complete circuit for the secondary air pump relay but found one that’s open, meaning there’s a break somewhere.
What the computer is actually seeing
The computer monitors the voltage in the secondary air pump relay circuit—ideally, it should see a voltage close to the battery voltage (around 12 volts) when the system is active and near 0 volts when off. If it sees an open circuit, it will trigger the P2430 code.
What a healthy reading looks like
12V nominal when activating the secondary air system, under 0.5V when off.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the fuse for the secondary air pump relay. If blown, replace it and retest.
- 22. Inspect the wiring and connectors in the secondary air pump circuit for damage or corrosion. Repair as needed and retest.
- 33. Use a multimeter to check the voltage at the relay connector while the secondary air system is activated. You expect 12V. If you get no voltage, replace the relay.
- 44. If you replace the relay and it still doesn't activate, listen for the secondary air pump operation. If it’s silent with proper voltage, replace the pump.
Common causes
- Blown fuse for the secondary air pump relay
- Corroded or damaged wiring in the secondary air pump circuit
- Faulty secondary air pump relay
- Failed secondary air pump
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's drivable but can affect emissions and may lead to a failed emissions test.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code pair with P0410?
P0410 refers to the system's failure to activate properly, while P2430 indicates a specific issue with the relay circuit.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →