P2258 OBD-II Trouble Code: Secondary Air Injection System Control A Circuit High

P2258 Code Definition

The P2258 trouble code is a generic powertrain code related to fuel and air metering (air injection circuit). This code appears when the engine control module (ECM) detects higher voltage levels than are acceptable in the A circuit.

The DTC Code P2558 is also related to:

• P2257: Secondary Air Injection System Control A Circuit Low
• P2259: Secondary Air Injection Sys Control B Circuit Low
• P2260: Secondary Air Injection Sys Control B Circuit High
• P2440: Secondary Air Injection Switching Valve Stuck Open Bank 1
• P2441: Secondary Air Injection Switching Valve Stuck Closed Bank 1
• P2442: Secondary Air Injection Switching Valve Stuck Open Bank 2
• P2443: Secondary Air Injection Switching Valve Stuck Closed Bank 2

What the P2258 Code Means

When a P2558 code appears, the engine control module (ECM) has located an issue with the secondary air injection system’s control circuit. The secondary air injection system assists with reducing a vehicle’s emissions by pumping air into the exhaust stream when an engine is cold, which helps speed up the process of warming the catalytic converter. This code most often appears in cold weather.

A vehicle’s ECM grounds both the air combination valve vacuum control solenoid circuit as well as the air pump’s relay control circuit. If a voltage reading of more than 10% of the allowed amount is read by the ECM, a P2558 code will be stored.

What Causes the P2258 Code?

A number of problems or faults could cause a P2258 code, including:

• Damaged or defective one-way check valve
• An open or shorted secondary air system relay harness
• A damaged or defective system relay
• Damaged or defective electrical circuit connections
• Damaged or defective solenoid
• Damaged or defective air system pump

What are the Symptoms of the P2258 Code?

Symptoms of the P2258 code include: * Warning or Check Engine Light is illuminated * Loud noises from the secondary air injection system * Vehicle stalling on startup * Vehicle stalling at idle * Hesitation when the vehicle accelerates

How Does a Mechanic Diagnose the P2258 Code?

A mechanic may use one or more methods to diagnose a P2258 code, including:

• Use an OBD-II scanner to locate any trouble codes stored in the PCM
• Clean pumps and assembly and test
• Check all switches and valves in secondary air injection system for any visible signs of damage
• Check all hoses and fittings for signs of damage or breaking due to heat from the exhaust system
• Check all wires and connectors for visible signs of damage due to heat from the exhaust system
• Clear the code and test drive the vehicle to see if any codes reappear

Common Mistakes in Diagnosing the P2258 Code

One of the most common mistakes in diagnosing any DTC related to the secondary air injection is not checking and diagnosing a potentially faulty one-way check valve. A misdiagnosis could result in repeat replacements related to the secondary air injection system and continuing pump failures.

How Serious is the P2258 Code?

Because a P2258 code stored in your ECM could result in your vehicle stalling or hesitating, causing dangerous driving conditions, YourMechanic considers this a potentially serious issue. Take your vehicle into your local dealer service center of repair shop for diagnosis and repair immediately.

What Repairs can Fix the P2258 Code?

• Repair or replace any damaged one-way check valves
• Repair or replace any damaged or defective switches
• Repair or replace any damaged or defective hoses or fittings
• Repair or replace any damaged or defective wires and connectors

Additional Comments for Consideration Regarding the P2258 Code

As with many codes related to the secondary air injection system, a damaged or faulty one-way check valve may be the culprit. YourMechanic recommends checking and testing these valves before making any further repairs, as a damaged one-way check valve potentially can damage other parts of the air injection system.

Need Help with a P2258 Code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.