What Does P1442 Mean?
The secondary air injection system monitor circuit is detecting higher than expected voltage. This suggests an open circuit, short to power, or a faulty air pump relay/control circuit.
Common Causes
35%
Short to voltage in air pump control circuit wiring
30%
Faulty secondary air injection relay stuck closed
20%
Open circuit in ground path for AIR pump monitor
10%
Damaged PCM driver circuit for AIR system
5%
Faulty secondary air pump with internal short
Diagnostic Steps
1
Step 1: Inspect secondary air injection relay and check for proper seating and condition
2
Step 2: Measure voltage at AIR pump control circuit with key on, system inactive (should be near 0V)
3
Step 3: Check for battery voltage shorts in wiring harness between PCM and AIR relay
4
Step 4: Test relay operation by removing it and checking coil resistance and contact continuity
5
Step 5: Verify ground circuit integrity for AIR monitor circuit using multimeter
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
The secondary air injection system monitor circuit is detecting higher than expected voltage. This suggests an open circuit, short to power, or a faulty air pump relay/control circuit.
The most common cause of P1442 (Secondary Air Injection System Monitor circuit High Voltage) is: Short to voltage in air pump control circuit wiring
Typical repair costs for P1442 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but will cause emissions test failure. May notice longer warm-up times and slightly increased emissions during cold starts.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1442 to identify the root cause.
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Quick Info
Category
Powertrain
System
Secondary Air Injection/Emissions System
Difficulty
Type
Manufacturer
Recommended Tools
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