What Does P1429 Mean?
The primary electric air pump (secondary air injection pump) has failed to operate properly. The ECM has detected a malfunction in the pump circuit, mechanical failure, or pump not delivering sufficient airflow.
Common Causes
45%
Failed electric air pump motor or seized pump
25%
Damaged wiring or connector to air pump
15%
Failed air pump relay or control circuit
10%
Corroded or loose electrical connections at pump
5%
ECM driver circuit failure for air pump control
Diagnostic Steps
1
Step 1: Listen for air pump operation during cold start or command pump on with scan tool (should hear motor running)
2
Step 2: Check air pump fuse and relay operation, verify relay clicks when commanded on
3
Step 3: Measure voltage at air pump connector when commanded on (should see battery voltage)
4
Step 4: If power is present, disconnect pump and test motor resistance (typically 2-5 ohms) and check for seized impeller
5
Step 5: Inspect check valves and air delivery hoses for blockages or leaks that could overload pump
Estimated Repair Cost
$300 - $800
Parts + labor, varies by vehicle and location
The primary electric air pump (secondary air injection pump) has failed to operate properly. The ECM has detected a malfunction in the pump circuit, mechanical failure, or pump not delivering sufficient airflow.
The most common cause of P1429 (Electric Air Pump Primary Failure) is: Failed electric air pump motor or seized pump
Typical repair costs for P1429 range from $300 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but will fail emissions testing. Catalytic converter warm-up takes longer, potentially affecting long-term converter life.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1429 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Secondary Air Injection/Emissions
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
