P0414
Secondary Air Injection System Switching Valve A Circuit ShortedP0414 is a generic OBD-II powertrain diagnostic trouble code: Secondary Air Injection System Switching Valve A Circuit Shorted. It is logged by the engine control unit when the egr monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P0414 means
P0414 is stored when the PCM detects a short circuit in the Secondary Air Injection (SAI) system switching valve "A" control circuit. Where P0413 describes a broken circuit (no current path), P0414 describes the opposite — current is flowing along an unintended path, either a short to ground or a short to supply voltage in the solenoid wiring or driver circuit.
Switching valve "A" controls the airflow gate that directs air from the secondary air pump into the exhaust stream on the primary bank. Its solenoid is controlled by the PCM, which expects a specific voltage and current response when it commands the valve on or off. A short to ground will pull the circuit low at all times, potentially causing the solenoid to remain permanently energised; a short to battery voltage will hold it high. In either case the PCM detects a voltage level inconsistent with its command state and logs P0414.
A shorted circuit carries more risk than an open circuit. If the solenoid is held permanently on due to a short, the secondary air pump may run continuously, accelerating motor wear and potentially drawing excessive current. A short to battery voltage can cause a parasitic drain or, in combination with a failed relay, keep the pump running after key-off. Prompt repair is advisable to prevent secondary failures in the pump and relay.
Common causes
Most-frequently reported root causes when P0414 is logged.
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1
Short to ground in the switching valve "A" solenoid signal or supply wire, caused by chafed insulation contacting a metal chassis component.
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2
Short to battery voltage in the solenoid circuit, holding the solenoid in a permanently energised state.
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3
Internal solenoid failure creating a direct short between winding turns or between the winding and solenoid housing.
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4
Damaged connector with bridged pins creating a short between signal and ground circuits.
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5
Water or fluid intrusion into the connector causing a conductive bridge.
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6
Clogged or disconnected vacuum hoses affecting valve actuation and triggering a current-monitoring fault.
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7
PCM output driver failure producing an incorrect voltage on the switching valve circuit (rare).
Symptoms drivers notice
How to diagnose P0414
A typical diagnostic flow when this code is present.
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1
Connect a scan tool and confirm P0414; check for companion codes including P0412 (generic valve A) and P0413 (valve A open) to understand fault history.
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2
Inspect the switching valve "A" wiring harness for chafing against chassis or exhaust components that could create a ground short.
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3
Inspect the solenoid connector for bridged or corroded pins and signs of fluid intrusion.
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4
With the solenoid unplugged, measure resistance from the signal wire to ground and to battery voltage — any low resistance reading indicates a wiring short.
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5
Measure solenoid winding resistance at the component; a near-zero reading (well below manufacturer spec) indicates an internal solenoid short.
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6
Use a scan tool actuator test to command the valve on and off while monitoring circuit voltage; a shorted circuit will not respond normally to the command.
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7
After repairing any wiring faults, verify the pump does not run continuously with the key on engine off, confirming the short has been eliminated.
Related powertrain codes
- P0400 — Exhaust Gas Recirculation Flow Malfunction
- P0401 — Exhaust Gas Recirculation Flow Insufficient Detected
- P0402 — Exhaust Gas Recirculation Flow Excessive Detected
- P0403 — Exhaust Gas Recirculation Circuit Malfunction
- P0404 — Exhaust Gas Recirculation Circuit Range/Performance
- P0405 — Exhaust Gas Recirculation Sensor A Circuit Low
Frequently asked questions
Is P0414 more serious than P0413?
Generally yes. An open circuit (P0413) simply means the valve does not operate — the pump and relay are unaffected. A shorted circuit (P0414) can cause continuous solenoid energisation, which keeps the pump running, accelerates motor wear, and may cause excessive current draw or battery drain. It should be repaired promptly.
Can a shorted solenoid damage the PCM?
A short to ground on the solenoid output can overload the PCM driver circuit if the PCM does not have current-limiting or thermal-protection on that output. Most modern PCMs include output protection, but prolonged exposure to a shorted load can degrade the driver over time. Repairing the short before replacing the solenoid is essential to avoid damaging a new PCM.
Will the secondary air pump run all the time with P0414?
It depends on whether the short is to ground (energising the solenoid) or to voltage (de-energising it). A short to ground can hold the solenoid open, meaning the pump would push air through the valve continuously when the pump relay is active. A short to voltage prevents the solenoid from opening at all, so the pump runs but no air passes. Either way, the pump and relay should be inspected for secondary damage.
What is the most common cause of P0414 in real-world repairs?
Wiring damage from heat is the most frequent cause — the secondary air injection system is located close to the exhaust manifold, and solenoid wiring that routes near hot components is prone to insulation cracking over time, eventually shorting to the chassis or exhaust metal. Inspecting the full harness route from the solenoid back to the PCM is an essential first step.
Disabling P0414 in software
RaceTune can permanently disable P0414 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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