What Does P2258 Mean?
The PCM detects a high voltage condition on the Secondary Air Injection system control circuit A. The control circuit voltage exceeds the maximum threshold, indicating an open circuit or lack of current flow.
Common Causes
30%
Open circuit in AIR pump or valve control wiring harness
25%
Failed AIR pump relay with open coil or contacts
20%
Corroded or disconnected AIR system connector
15%
Failed AIR pump motor with open circuit
10%
Blown fuse in AIR system power circuit
Diagnostic Steps
1
Step 1: Check AIR system fuse and relay operation, replace if faulty
2
Step 2: Verify continuity in control circuit from PCM to AIR pump/relay
3
Step 3: Inspect AIR pump connector for corrosion, damage, or loose terminals
4
Step 4: Command AIR system on with scan tool and monitor voltage at pump connector
5
Step 5: Test AIR pump motor for open circuit if all wiring and relay circuits test normal
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The PCM detects a high voltage condition on the Secondary Air Injection system control circuit A. The control circuit voltage exceeds the maximum threshold, indicating an open circuit or lack of current flow.
The most common cause of P2258 (Secondary Air Injection System Control "A" Circuit High) is: Open circuit in AIR pump or valve control wiring harness
Typical repair costs for P2258 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No safety concerns for driving. Secondary air system failure only affects cold-start emissions and will trigger check engine light.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2258 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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