On engines with an electric secondary air (AIR) pump, a pressure sensor in the duct between pump and shut-off valve tells the engine computer whether air is really moving to bank 1. P2430 is the basic signal fault of that sensor. GM applies it in a special way: on the 2005–2006 3.8L V6 and the 2006 Corvette and CTS-V V8s it stands for a reading that stays frozen while the pump is commanded on (average error below 0.5 and variance below 1.0 for more than 5 s, once per trip, Type B with MIL after two trips); the 2018 tables keep this logic. Low and high voltage have their own codes, P2432 and P2433; P2435 is the bank 2 twin. The car drives normally, but the secondary air check cannot finish.
Low severity. Can I keep driving?Yes, you can keep driving, though it should be repaired: the car pollutes more at startup and may not pass an inspection.
Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.
Symptoms
- Check engine lamp after two cold starts
- Secondary air readiness not set, emissions test refused
- No noticeable change in driving behaviour
Most likely causes
- Pressure sensor no longer reacts, signal frozen at one value
- Sensor port or duct blocked by water, ice or debris from the pump
- Corroded connector or damaged harness at the sensor
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P2430 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 4: Emissions
- 30: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2430?
Yes, you can keep driving, though it should be repaired: the car pollutes more at startup and may not pass an inspection.
What causes code P2430?
The most common causes are: pressure sensor no longer reacts, signal frozen at one value; sensor port or duct blocked by water, ice or debris from the pump; corroded connector or damaged harness at the sensor.
Related codes
- P2431AIR System Air Flow/Pressure Sensor Circuit Range/Performance (Bank 1)
- P2432AIR System Air Flow/Pressure Sensor Circuit Low (Bank 1)
- P2433AIR System Air Flow/Pressure Sensor Circuit High (Bank 1)
- P2434AIR System Air Flow/Pressure Sensor Circuit Intermittent/Erratic (Bank 1)
- P2435AIR System Air Flow/Pressure Sensor Circuit (Bank 2)
- P0411AIR System A Incorrect Flow Detected
Sources
- gsi.ext.gm.com: 2006file4
- gsi.ext.gm.com: 2006file1
- gsi.ext.gm.com: 18OBDG03A Engine Diagnostics
- law.cornell.edu: 13 CCR 1968.2
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.