What Does P1422 Mean?
The PCM has detected that the Secondary Air Injection valve control circuit has a short to battery voltage (B+). This causes the valve to receive constant power when it should be PCM-controlled.
Common Causes
40%
Wiring harness damaged and contacting power source
25%
Failed SAI valve solenoid with internal short to power
20%
Control module internal driver circuit shorted high
15%
Connector terminal cross-contamination or melted housing
Diagnostic Steps
1
Step 1: Disconnect SAI valve connector and measure voltage at harness side control wire with key on - should read 0V unless PCM commands activation
2
Step 2: If voltage present with valve disconnected, inspect harness routing for contact with hot wires or battery voltage sources
3
Step 3: Check for voltage at PCM connector terminal for SAI valve control - voltage present with valve disconnected indicates PCM fault
4
Step 4: Test SAI valve solenoid by applying battery voltage directly - should click and hold; test resistance across terminals
5
Step 5: Repair wiring if harness fault found; replace valve if internal short confirmed; replace control module if driver circuit faulty
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected that the Secondary Air Injection valve control circuit has a short to battery voltage (B+). This causes the valve to receive constant power when it should be PCM-controlled.
The most common cause of P1422 (Secondary Air Injection Valve Circuit Short To B+) is: Wiring harness damaged and contacting power source
Typical repair costs for P1422 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive with no immediate safety risk. The fault affects emissions control only and may cause SAI pump to run incorrectly or continuously.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1422 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control - Secondary Air Injection
Difficulty
Type
Manufacturer
Recommended Tools
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