P0417
Fix within 1-2 weeksThe engine computer detected a high voltage condition in the circuit controlling the secondary air injection (SAI) switching valve 'B'. This valve directs fresh air into the exhaust during cold starts to help the catalytic converter warm up faster.
Code P0417 means your secondary air injection switching valve 'B' circuit has a high voltage. Common causes: Faulty SAI valve (70%), wiring issues (25%). Drivability: Yes, safe to drive. Repair cost: $80-$300 DIY, $180-$750 professional.
Can I Drive With P0417?
Yes, safe to drive
No restrictions
Stop driving immediately if: No need to stop driving unless other symptoms develop.
Symptoms of P0417
- 1Check Engine Light is on
- 2No noticeable change in engine performance
- 3Failed emissions inspection
Common Causes of P0417
Parts most likely causing this code, ranked by probability
The solenoid inside the valve can short internally or fail, causing the engine computer to detect an abnormally high voltage in its control circuit.
70% of P0417 cases are fixed by replacing this part
Damaged, corroded, or shorted wiring (especially a short to a power wire) or a faulty connector can cause a high voltage reading in the valve's circuit.
25% of P0417 cases are fixed by repairing wiring or connectors
A rare internal fault within the engine computer could incorrectly report a high voltage in the SAI valve 'B' circuit.
5% of P0417 cases are fixed by replacing the ECM/PCM
Check These First (Before Buying Parts)
- Visually inspect the electrical connector and wiring to the SAI Switching Valve B for any obvious damage, corrosion, or loose pins.
- Listen for the secondary air pump running during a cold start (it should run for about 30-90 seconds). If it doesn't run at all, the problem might be upstream.
How to Diagnose P0417
- 1Visually inspect the wiring harness and connector leading to the Secondary Air Injection (SAI) Switching Valve B for any signs of damage, corrosion, or loose connections.
- 2Using a multimeter, check for proper voltage and ground at the SAI Switching Valve B connector with the key on and engine off, then during a cold start.
- 3Test the resistance of the SAI Switching Valve B solenoid itself; compare readings to manufacturer specifications.
- 4If the valve is vacuum-operated, check for proper vacuum supply and operation of any associated vacuum switching valves.
- 5If all other components test good, consider further diagnostics of the Engine Control Module (ECM/PCM) by a qualified technician.
P0417 on Popular Vehicles
Subaru Outback
2005-2014Subaru vehicles, particularly those with the H6 engine, are known for secondary air injection system issues. P0417 often points to a failed SAI switching valve 'B' or related wiring due to exposure to heat and moisture.
75% fixed by replacing the SAI Switching Valve B or repairing wiring
Toyota Tundra
2007-2021Some Toyota Tundra models, especially those with the 5.7L V8, can experience SAI system failures. P0417 can indicate a problem with the SAI switching valve 'B' sticking or having an electrical fault, often exacerbated by carbon buildup.
70% fixed by replacing the SAI Switching Valve B
Chevrolet Silverado
2007-2013Certain Chevrolet Silverado trucks with V8 engines have documented issues with the secondary air injection system. P0417 can be caused by a faulty SAI switching valve 'B' or a short in its control circuit, sometimes due to water intrusion into connectors.
65% fixed by replacing the SAI Switching Valve B
Frequently Asked Questions
What does P0417 mean?
P0417 indicates that your vehicle's engine computer has detected a high voltage condition in the circuit that controls the secondary air injection (SAI) switching valve 'B'. This valve is part of the emissions system that helps reduce pollution during cold engine starts.
Can I drive with P0417?
Yes, you can drive safely with a P0417 code. This code typically does not affect engine performance or drivability. However, your vehicle will be emitting higher levels of pollutants during cold starts, and it will fail an emissions inspection.
Will P0417 clear itself?
No, P0417 will not clear itself. The Check Engine Light will remain on until the underlying issue with the secondary air injection system is diagnosed and repaired. After the repair, you may need to drive several drive cycles for the computer to confirm the fix and turn off the light, or you can clear it with a scan tool.
How do I fix P0417 myself?
To fix P0417 yourself, start by visually inspecting the wiring and connector to the SAI switching valve 'B' for damage or corrosion. If the wiring is good, you'll need to test the SAI switching valve 'B' itself using a multimeter to check its resistance and ensure it's receiving proper voltage and ground. If the valve is faulty, replacing it is the next step.
How much does it cost to fix P0417?
The cost to fix P0417 varies. If you do it yourself, expect to pay $80-$300 for a new secondary air injection switching valve. If you take it to a professional shop, the total cost, including parts and labor, will likely be $180-$750.
P0417 keeps coming back - why?
If P0417 keeps coming back, it means the root cause was not fully addressed. Common reasons for recurrence include: an intermittent wiring issue that wasn't fully repaired, a faulty replacement valve, or a deeper problem like a failing Engine Control Module (though this is rare). Ensure all connections are secure and corrosion-free.
Will P0417 fail emissions/smog test?
Yes, P0417 will cause your vehicle to fail an emissions or smog test. The secondary air injection system is a critical component of your vehicle's emissions control, and a fault in this system means your vehicle is not meeting required pollution standards.
What's the difference between P0417 and P0410?
P0417 specifically indicates a high circuit voltage problem with the secondary air injection switching valve 'B'. P0410 is a more general code indicating a malfunction in the entire secondary air injection system, which could be caused by the pump, valves, or related hoses, not just a specific circuit issue with valve 'B'.
P0417 on Subaru Outback
On Subaru Outback models, especially those with the H6 engine, the secondary air injection system is a known trouble spot. While P0410/P0411 are more common, P0417 can occur due to a faulty SAI switching valve 'B' or corroded wiring to it. These valves can stick or fail electronically over time due to exhaust heat and moisture.
Questions to Ask Your Mechanic
Did you check the voltage and ground at the SAI switching valve 'B' connector?
Good answer: Yes, I confirmed the correct voltage and ground signals are present at the connector, which tells me the wiring from the PCM is good. The issue is likely internal to the valve itself.
What was the resistance reading of the SAI switching valve 'B' solenoid?
Good answer: The resistance was out of specification (either too high or a dead short), indicating an internal fault with the valve's solenoid.
Repair Cost Estimate
DIY Repair
Parts only
$80-$300
Shop Repair
Parts + labor
$180-$750
Save $100-$450 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires a multimeter and basic electrical diagnostic skills beyond simple part replacement.
Cost of Waiting
Ignoring P0417 means your vehicle will continue to emit higher levels of pollutants during cold starts, contributing to air pollution. It will also cause your vehicle to fail any required emissions or smog inspections, preventing you from renewing your registration. While it won't damage your engine, it's an emissions violation.
While You're In There...
If the SAI valve is being replaced, inspect the associated hoses and pipes for cracks, leaks, or blockages, as they are often brittle or carbon-clogged from age and heat.
Some SAI systems use a check valve to prevent exhaust gases from entering the pump. If you're working on the system, it's a good idea to inspect or test this valve for proper operation.
Tools You'll Need
- OBD-II scan tool
- Multimeter
- Basic hand tools (sockets, wrenches)
- Wire stripper/crimper (if wiring repair is needed)
P0417 is a common emissions code. It does not typically affect how your vehicle drives, and the repair is usually straightforward, getting your vehicle back to proper emissions standards.
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Your Next Steps
Step 1: Visually inspect the wiring and connector for the SAI Switching Valve B. Look for frayed wires, corrosion, or loose connections. Repair any damage found.
Step 2: If wiring is good, use a multimeter to test the voltage and ground at the valve's connector and the resistance of the valve's solenoid. Compare readings to your vehicle's service manual specifications.
Step 3: If the valve tests faulty, replace the Secondary Air Injection Switching Valve B. You'll likely need a new valve and possibly new gaskets.