P0416
Fix within a few daysSecondary Air Injection System Switching Valve 'B' Circuit Open
Code P0416 means the secondary air injection system switching valve 'B' circuit is open. Common causes: Faulty valve (60%), wiring issues (30%), blown fuse (9%). Drivability: Yes, safe to drive. Repair cost: $50-$200 DIY, $300-$650 professional.
Can I Drive With P0416?
Yes, safe to drive
No restrictions
Stop driving immediately if: No need to stop driving for this code unless other symptoms develop.
Symptoms of P0416
- 1Check Engine Light is on
- 2Engine may run rough on cold start (less common)
- 3Increased emissions (not directly noticeable by driver)
Common Causes of P0416
Parts most likely causing this code, ranked by probability
The valve itself has an internal open circuit, preventing the PCM from controlling it.
60% of P0416 cases are fixed by replacing this valve
A broken, corroded, or disconnected wire in the circuit leading to the switching valve 'B' causes an open circuit.
30% of P0416 cases are fixed by repairing wiring
A short in the AIR pump or valve 'B' circuit can blow a fuse, leading to an open circuit at the valve.
9% of P0416 cases are fixed by replacing a fuse
A rare internal failure within the PCM's driver circuit for the AIR switching valve 'B' can cause this code.
1% of P0416 cases are fixed by replacing the PCM
Check These First (Before Buying Parts)
- Check the fuse for the Secondary Air Injection system in your vehicle's fuse box. A blown fuse is a quick and cheap fix.
- Visually inspect the wiring harness and connector leading to the AIR switching valve 'B'. Look for any obvious breaks, fraying, or corrosion.
How to Diagnose P0416
- 1Check the fuse for the Secondary Air Injection system. Replace if blown.
- 2Visually inspect the wiring harness and connector leading to the AIR switching valve 'B' for damage, corrosion, or loose connections.
- 3Using a multimeter, check for continuity and resistance across the terminals of the AIR switching valve 'B' itself. Compare to factory specifications.
- 4With the engine off and key on, check for voltage at the valve's connector. Then, check for a ground signal from the PCM when commanded on (requires a scan tool capable of active tests).
P0416 on Popular Vehicles
Honda CR-V
2007-2014Honda models often experience issues with the AIR pump and its associated switching valves due to exposure to moisture or internal component failure. The 'B' valve is a common failure point.
75% fixed by replacing valve or repairing wiring
Toyota Tundra
2007-2021Toyota trucks and SUVs are known for secondary air injection system failures, often involving the switching valves sticking or having electrical issues. Corrosion in the connectors is also common.
70% fixed by replacing valve or repairing wiring
Ford F-150
2004-2014Some Ford F-150 models, particularly with the 5.4L engine, can develop issues with the AIR system switching valves. Electrical opens are often due to internal valve failure or damaged wiring near the exhaust.
65% fixed by replacing valve or repairing wiring
Frequently Asked Questions
What does P0416 mean?
P0416 indicates that your vehicle's engine computer has detected an open circuit in the control circuit for the secondary air injection (AIR) system's switching valve 'B'. This valve helps direct fresh air into the exhaust during cold starts to reduce emissions.
Can I drive with P0416?
Yes, you can drive safely with a P0416 code. This code typically does not cause immediate drivability issues or put you at risk of a breakdown. However, it will cause your vehicle to fail an emissions test.
Will P0416 clear itself?
No, P0416 will not clear itself. The engine computer will store this code until the underlying electrical issue with the secondary air injection system switching valve 'B' circuit is diagnosed and repaired. You will need to clear the code with a scan tool after the repair.
How do I fix P0416 myself?
To fix P0416 yourself, start by checking the AIR system fuse. If the fuse is good, inspect the wiring and connector to the AIR switching valve 'B' for any damage or corrosion. If the wiring looks good, you will likely need to test and replace the AIR switching valve 'B' itself.
How much does it cost to fix P0416?
The cost to fix P0416 yourself is typically $50-$200 for a new AIR switching valve 'B' or wiring repair parts. If you take it to a shop, expect to pay $300-$650, which includes diagnosis, parts, and labor.
P0416 keeps coming back - why?
If P0416 keeps coming back, it means the initial repair did not fully address the problem. Common reasons for recurrence include a faulty wiring repair, a new valve that is also defective, or an underlying issue with the AIR pump causing a fuse to blow repeatedly. A thorough electrical diagnosis is necessary.
Will P0416 fail emissions/smog test?
Yes, P0416 will cause your vehicle to fail an emissions or smog test. The secondary air injection system is a critical component of the emissions control system, and a fault in it will prevent your vehicle from passing inspection.
What's the difference between P0416 and P0410?
P0416 specifically indicates an open circuit in the control circuit for the secondary air injection switching valve 'B'. P0410, on the other hand, is a more general code indicating a malfunction in the overall secondary air injection system, which could be the pump, valves, or related sensors.
P0416 on Honda CR-V?
On many Honda CR-V models, especially those from the mid-2000s to early 2010s, the secondary air injection system components, including the switching valves, are known to fail due to corrosion or internal electrical issues. Focus diagnosis on the valve and its wiring.
Questions to Ask Your Mechanic
Did you check the resistance of the secondary air injection switching valve 'B' itself?
Good answer: Yes, I measured the resistance and it was outside the specified range, indicating an internal open circuit. I've ordered a new valve.
What did you find when you inspected the wiring and connector to the valve?
Good answer: I found a corroded pin in the connector, which was causing the open circuit. I've repaired the connector and confirmed continuity.
Repair Cost Estimate
DIY Repair
Parts only
$50-$200
Shop Repair
Parts + labor
$300-$650
Save $250-$450 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires basic electrical diagnostic skills and a multimeter to accurately pinpoint the fault beyond a simple visual inspection or fuse check.
Cost of Waiting
Ignoring P0416 means your vehicle will continue to produce higher emissions during cold starts and will fail any required emissions testing. While it won't damage the engine, it's an environmental compliance issue that needs attention.
While You're In There...
If the valve is being replaced, inspect the rubber hoses connected to it. They can become brittle, cracked, or loose over time, leading to air leaks.
Tools You'll Need
- OBD-II Scan Tool
- Multimeter
- Basic Socket Set
- Wire Strippers/Crimpers (if wiring repair needed)
- Electrical Tape or Heat Shrink Tubing
P0416 is a common emissions system code. It's usually a straightforward electrical repair involving a valve or wiring, and your engine will run just fine once it's fixed.
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Your Next Steps
Step 1: Locate the secondary air injection system fuse (check your owner's manual) and inspect it. Replace if blown.
Step 2: If the fuse is good, visually inspect the wiring and connector at the AIR switching valve 'B' for any damage or corrosion. Repair as needed.
Step 3: If the fuse and wiring are good, use a multimeter to test the resistance of the AIR switching valve 'B'. If it's an open circuit or out of specification, replace the valve.