P0201
Fix within a few daysThe engine computer detected an electrical fault in the fuel injector circuit for cylinder #1.
Code P0201 means there's an electrical problem with your cylinder 1 fuel injector. Common causes: Faulty injector (60%), wiring/connector issues (30%). Drivability: Yes, for short trips, but fix quickly. Repair cost: $50-$150 DIY, $200-$500 professional.
Can I Drive With P0201?
Yes, for short trips only
Essential trips under 10 miles, avoid highways and heavy acceleration. Stop driving if the Check Engine Light is flashing.
Stop driving immediately if: Flashing Check Engine Light, significant power loss, loud knocking noises, or a strong smell of raw fuel.
Symptoms of P0201
- 1Check Engine Light is on (may flash)
- 2Engine misfires or runs rough
- 3Reduced engine power
- 4Poor fuel economy
- 5Engine hesitation or stumbling
- 6Rough idle
Common Causes of P0201
Parts most likely causing this code, ranked by probability
The fuel injector itself has an internal electrical open or short circuit, preventing it from operating correctly.
60% of P0201 cases are fixed by replacing this part
Damaged, corroded, or disconnected wiring or a faulty connector to the cylinder #1 fuel injector disrupts the electrical signal.
30% of P0201 cases are fixed by repairing or replacing wiring/connector
The engine computer's internal driver circuit for the cylinder #1 injector is faulty, preventing it from sending the correct signal.
10% of P0201 cases are fixed by replacing the ECM/PCM
Check These First (Before Buying Parts)
- Visually inspect the electrical connector on cylinder #1 fuel injector for looseness, corrosion, or damage.
- Inspect the wiring leading to the cylinder #1 injector for any signs of chafing, cuts, or rodent damage.
How to Diagnose P0201
- 1Visually inspect the wiring harness and connector for cylinder #1 fuel injector for damage, corrosion, or looseness.
- 2Listen to the cylinder #1 fuel injector with a stethoscope or long screwdriver to confirm it is clicking (indicating it's firing).
- 3Using a multimeter, test the electrical resistance of the cylinder #1 fuel injector. Compare it to specifications and other injectors.
- 4Use a noid light or multimeter to check for power and ground signals at the cylinder #1 injector connector while cranking the engine.
- 5If possible, swap the cylinder #1 fuel injector with an injector from another cylinder and see if the P0201 code moves to the new cylinder.
P0201 on Popular Vehicles
Toyota Camry
2007-2024On Toyota Camry models, P0201 is frequently linked to a failing injector or a corroded connector. Carbon buildup on the injector tip can also sometimes lead to electrical issues.
75% fixed by replacing injector or repairing wiring
Honda Accord
2003-2024Honda Accord vehicles with P0201 often point to an internal electrical fault within the injector. Inspecting the wiring for rodent damage or chafing is also a critical first step.
70% fixed by replacing injector or repairing wiring
Ford F-150
2004-2024For Ford F-150 trucks, P0201 is a common code, particularly on the 5.4L and 5.0L engines. Injector failure is prevalent, but also check for issues with the injector harness, which can become brittle over time.
80% fixed by replacing injector or repairing wiring
Frequently Asked Questions
What does P0201 mean?
P0201 indicates the engine's computer has detected an electrical malfunction in the circuit that controls the fuel injector for cylinder #1. This means the computer isn't seeing the expected electrical signal from or to that injector.
Can I drive with P0201?
Yes, you can drive for short, essential trips, but you must fix it quickly. A persistent misfire from a faulty injector can send unburned fuel into your exhaust, causing severe damage to your catalytic converter.
Will P0201 clear itself?
No, P0201 will not clear itself. This code indicates a hard electrical fault that requires diagnosis and repair. The Check Engine Light will remain on until the underlying issue is resolved and the code is cleared, either by the vehicle's computer after several drive cycles or with an OBD-II scan tool.
How do I fix P0201 myself?
Start by visually inspecting the injector #1 wiring and connector. If they look good, test the injector's resistance with a multimeter. If the resistance is out of spec, replace the cylinder #1 fuel injector. If resistance is good, use a noid light to check for proper electrical pulse at the injector connector.
How much does it cost to fix P0201?
DIY repair for P0201 typically costs $50-$150 for a new fuel injector. Professional repair at a shop will cost $200-$500, which includes parts and 1-2 hours of labor.
P0201 keeps coming back - why?
If P0201 keeps returning, it means the root cause was not fully addressed. Common reasons include a faulty wiring harness that was only temporarily fixed, a new injector that is also faulty, or a rare but possible issue with the Engine Control Module (ECM/PCM) itself.
Will P0201 fail emissions/smog test?
Yes, P0201 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions, and a misfire directly impacts exhaust emissions.
What's the difference between P0201 and P0301?
P0201 specifically indicates an electrical circuit malfunction with the cylinder #1 fuel injector. P0301 indicates a misfire detected in cylinder #1, which means the cylinder is not contributing power correctly. A P0201 code will almost always cause a P0301 code, but a P0301 can be caused by many other issues like spark plugs, ignition coils, or compression problems, not just the injector circuit.
P0201 on Ford F-150?
On Ford F-150s, P0201 is often caused by a faulty fuel injector itself, especially on higher mileage vehicles. Wiring harness issues, particularly around the injector connectors, are also common due to engine heat and vibration. Always check the connector and wiring thoroughly before replacing the injector.
Questions to Ask Your Mechanic
Did you test the resistance of the cylinder #1 fuel injector and compare it to specifications?
Good answer: Yes, I measured the resistance at X ohms, and it was outside the factory specification of Y-Z ohms, indicating an internal fault.
Did you check for power and ground signals at the injector #1 connector using a noid light or multimeter?
Good answer: Yes, I confirmed there's a consistent 12V power supply and a pulsing ground signal when cranking, which means the ECM is trying to fire the injector.
Have you inspected the wiring harness for cylinder #1 for any signs of damage or corrosion?
Good answer: Yes, I traced the wiring from the ECM to the injector and found no visible damage, chafing, or corrosion at the connector.
Repair Cost Estimate
DIY Repair
Parts only
$50-$150
Shop Repair
Parts + labor
$200-$500
Save $150-$350 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires basic electrical testing knowledge and tools like a multimeter and noid light, along with standard hand tools.
Cost of Waiting
Ignoring P0201 and the resulting misfire sends unburned fuel into your exhaust system. This rapidly overheats and destroys your catalytic converter, turning a $50-$150 fuel injector repair into a $1,200-$2,500 catalytic converter replacement.
While You're In There...
When replacing an injector, new O-rings are essential to prevent fuel leaks and ensure a proper seal, often included with new injectors.
If the intake manifold needs to be removed to access the injectors, replacing the gasket prevents vacuum leaks and ensures a proper seal upon reassembly.
Tools You'll Need
- OBD-II Scan Tool
- Multimeter
- Noid Light Set
- Basic Hand Tools (sockets, wrenches)
- Stethoscope (or long screwdriver)
P0201 is a common electrical fault code that is usually straightforward to diagnose and fix. Most repairs involve replacing a single fuel injector, and your engine will run smoothly again afterward.
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Your Next Steps
Step 1: Perform a thorough visual inspection of the cylinder #1 fuel injector's electrical connector and wiring for any obvious damage or corrosion.
Step 2: Use a multimeter to test the resistance of the cylinder #1 fuel injector. If it's outside the manufacturer's specifications, replace the injector.
Step 3: If the injector resistance is good, use a noid light to confirm the ECM is sending a proper electrical pulse to the injector. If there's no pulse, further electrical diagnosis or ECM testing is needed. Parts you'll likely need: one fuel injector for cylinder #1, a set of new injector O-rings.