P0201 code: Injector Circuit/Open - Cylinder 1
P0201 means injector Circuit/Open - Cylinder 1. The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0201 means
The engine computer fires each fuel injector by pulsing its electrical circuit, and it watches that circuit for the expected voltage and current response. P0201 sets when the computer sees an open circuit, a short, or the wrong resistance on the cylinder 1 injector circuit. This is an ELECTRICAL fault — it is not the same as a clogged injector, which passes electricity fine and would not set this code. The most common culprits are an unplugged or corroded injector connector, chafed wiring between the harness and the injector, or a failed coil winding inside the injector itself. Rarely, the injector driver inside the engine computer is at fault. Because the injector may not fire at all, cylinder 1 often goes dead and you will frequently see the matching misfire code P0301 alongside it.
P0201 symptoms
- Misfire on cylinder 1, often with the companion code P0301
- Rough idle or a noticeable shake at a stop
- Check-engine light, which may flash during an active misfire
- A 'dead cylinder' feel — down on power, especially under load
- Hard starting or extended cranking in some cases
What it costs to fix P0201
Typical range: $80–$550 · about ~0.5–2 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| Fuel injector (single) | $50–$300 | ~0.5–2 hrs |
| Wiring / connector repair | $10–$60 | ~0.5–1.5 hrs |
Access drives the price. On many inline engines the injectors sit right on top; on some V engines the intake manifold must come off to reach them, which adds labor. These ranges are for common gasoline port-injection and direct-injection engines — diesel injectors and some high-pressure direct injectors cost far more.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0201 for my exact vehicle →
How to fix P0201
Moderate — doable at home with common tools and patience
- Check whether other injector codes set with it
Scan every module and write down the full code list. P0201 on its own, usually with P0301, keeps the search on cylinder 1's own connector, wire, and injector. Several injector circuit codes at once point instead at something they share — an injector fuse, the relay that powers them, or a common splice — so test that first.
- Unplug and inspect the cylinder 1 injector connector
On most inline engines cylinder 1 sits at the timing-belt or chain end; on V engines it is usually the front cylinder of bank 1. Release the lock and look for green corrosion, a pushed-back terminal, or oil inside the plug. A connector disturbed during plug or valve-cover work and never fully latched is a classic cause.
- Measure injector 1's winding resistance
With the connector off, put a multimeter across the two injector pins. High-impedance port injectors commonly read somewhere around 11–18 ohms, but the real test is whether injector 1 matches the others on the same engine and the spec for your engine. An infinite reading means an open winding; near zero means shorted turns.
- Confirm key-on power reaches the harness plug
One terminal of the harness connector should show battery voltage with the key on (a few designs only energize it for a moment at key-on or while cranking). No voltage with healthy fuses means a break in the feed branch to injector 1; voltage present plus a good injector sends you to the control wire running back to the engine computer.
- Replace the injector, then consider the driver
If the winding failed, relieve fuel pressure and fit a new injector with lubricated O-rings. Blame the engine computer only after the injector and both wires test good — and if the old injector was shorted, install the new injector before any new module, because a shorted winding can kill a replacement driver too.
DIY or shop? On a port-injected four-cylinder, cylinder 1's connector and injector are usually reachable from the top of the engine, so the inspection, resistance check, and even the injector swap are fair driveway jobs with basic tools. Direct-injection engines are a different matter: the injectors are fired at high voltage, sit in the cylinder head under the intake, and need special pullers and seals — leave those to a shop. An engine-computer replacement also has to be programmed to the vehicle, which is shop work.
Tools for the DIY steps: OBD-II scan tool · Digital multimeter · Back-probe pins · Fuel injector O-ring kit · Fuel line disconnect tool
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0201.
Start a case with P0201 and your car. Redline weighs these causes against what your car shows, and names the check that would settle it before you buy parts.
Can I drive with P0201?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0201: common questions
Can I drive with P0201?
Redline can't judge that from the code alone. A cylinder that isn't firing sends raw fuel toward the catalytic converter, and a flashing light means the converter is at risk right now — stop driving and have it towed. Don't treat this as a code you can ignore for weeks.
Is P0201 the injector or the wiring?
Either — the code only says the circuit is faulty. Start cheap: unplug the cylinder 1 injector connector and look for corrosion or bent pins, then measure the injector's resistance with a multimeter and compare it to a neighboring cylinder. Matching resistance points to wiring; an open or wildly different reading points to the injector.
Why do I also have P0301?
P0301 is the misfire code for cylinder 1. If the injector circuit fails, the cylinder gets no fuel and misfires, so the two codes commonly appear together. Fix the circuit fault first — the misfire code usually goes away with it.
How much does it cost to fix P0201?
A corroded connector or chafed wire is a cheap repair. A replacement injector is a moderate part cost plus half an hour to two hours of labor, more if your engine requires intake removal to reach the injectors. Diesel and some direct-injection injectors are considerably pricier.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0201 from your phone. See our guide to the best OBD2 Bluetooth adapters. Run a repair shop? See Redline for shops.
Generic OBD-II reference. Manufacturer-specific behavior varies. Confirm with a scan tool and, for safety-related codes, a professional inspection. Cost ranges are reference ranges, not quotes.
Seeing P0201 on your car?
Every problem becomes a Case. Tell Redline what the car is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.