P0265 code: Cylinder 2 Injector Circuit High
P0265 means cylinder 2 Injector Circuit High. The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0265 means
When the ECM pulses the cylinder 2 injector, it expects the circuit voltage to follow a predictable pattern — P0265 sets when that voltage runs higher than expected. Common culprits are a short to battery voltage somewhere in the harness, or unwanted resistance from a corroded connector, a damaged terminal, or an injector winding that has failed open. It's worth stressing that this is an electrical-path fault: a mechanically dirty or clogged injector produces different evidence, usually just a misfire code. Since only cylinder 2 is implicated, comparing components against a healthy cylinder isolates the problem quickly, and a swap test settles whether the injector or the harness is at fault. P0265 frequently travels with P0202 and P0302, its circuit and misfire companions for the same cylinder. Check your engine's cylinder-numbering diagram, because layouts differ by manufacturer.
P0265 symptoms
- Dead or intermittent cylinder 2 causing rough running
- Shaking at idle that may smooth out at higher rpm
- Loss of power and reduced fuel economy
- Check-engine light, flashing if the misfire is severe
- Occasionally no symptoms when the fault is intermittent
What it costs to fix P0265
Typical range: $60–$450 · 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 | $5–$50 | ~0.5–2 hrs |
If it turns out to be a corroded pin or chafed wire, the repair is cheap. An injector replacement is the pricier path, especially on V-engines where the intake must come off, or direct-injection engines whose injectors cost considerably more.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0265 for my exact vehicle →
How to fix P0265
Moderate — doable at home with common tools and patience
- Check whether cylinder 2 is actually dead
Read live misfire counts, or listen at injector 2 with a stethoscope at idle. No click and a steady misfire mean the circuit never switches, which fits an open or a control wire shorted to power; a normal click with an intermittent code points toward a marginal connection that only breaks under vibration.
- Test terminal fit at the injector 2 plug
Pull the connector and look for pushed-back terminals, a cracked shell or moisture. Slide a matching male test terminal into each socket — it should grip; a loose fit means the contact is barely touching and adds resistance that reads as circuit high. Re-tension or replace the terminal rather than packing it with grease.
- Read injector 2's winding resistance
Compare injector 2 with two or three others on the same engine. A winding that reads open or clearly higher than the group is failed, even if it still clicks now and then; a typical high-impedance spec is roughly 11 to 18 ohms, but check the figure for your engine.
- Scope the control wire at both ends
An ohmmeter passes tiny current, so a wire down to a strand or two can still look fine. With a scope on the control wire at the injector and at the module's injector 2 pin while idling, the bottom of each pulse should sit almost as low at the injector as at the module; a clearly higher floor at the injector means resistance in that run.
- Repair the wire properly and verify
Cut out a damaged section and splice in new wire with solder and heat-shrink, then route it clear of sharp edges and hot spots with the original clips. Clear codes, confirm cylinder 2 clicks with the rest, and drive over some rough road before rescanning.
DIY or shop? Terminal checks and resistance comparisons are simple at home, and a loose or corroded connector is a common, inexpensive end to this code. The scope work on a running engine needs the right equipment and a wiring diagram, which is where many DIYers stop. If cylinder 2's connector is tucked under the intake or the problem is inside the harness rather than at a plug, a shop with scope time will usually find it faster than replacing an injector on a hunch.
Tools for the DIY steps: Mechanic's stethoscope · Terminal test probe kit · Digital multimeter · Lab scope · Solder, heat-shrink and wire strippers
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0265.
Start a case with P0265 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 P0265?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0265: common questions
P0265 vs P0264 — what's the difference?
Both concern the cylinder 2 injector circuit; the difference is which way the voltage went wrong. P0264 (low) points toward a short to ground or shorted injector coil. P0265 (high) points toward an open circuit, added resistance from corrosion, or a short to battery voltage.
Could this just be a corroded connector?
Very possibly — a corroded or loose injector connector is one of the most common causes of a circuit-high code, because oxidized pins add resistance. Unplugging the connector and inspecting the terminals for green or white corrosion is a smart first step before buying an injector.
How urgent is P0265?
Moderately. The car will usually still drive, but a cylinder that fires erratically or not at all risks catalytic converter damage from unburned fuel. Plan the repair within days rather than weeks, and stop driving if the check-engine light flashes.
Why do I also have P0302?
P0302 is the misfire code for the same cylinder. The circuit fault P0265 describes keeps the injector from delivering fuel correctly, cylinder 2 misfires, and both codes store. Fix the electrical fault and the misfire code should stop returning.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0265 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 P0265 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.