P0274 code: Cylinder 5 Injector Circuit High
P0274 means cylinder 5 Injector Circuit High. The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0274 means
P0274 records higher-than-expected voltage on the cylinder 5 injector control circuit. That direction of fault usually means one of two things: the circuit is touching battery voltage somewhere it shouldn't, or extra resistance has crept in — through a corroded connector, a damaged terminal, or an injector winding that has gone open or drifted out of spec. Because the injector monitor watches electricity rather than fuel flow, this code is distinct from a clogged nozzle, which shows up as a plain misfire instead. Only cylinder 5 is named, so testing against a healthy cylinder quickly separates a bad injector from bad wiring. P0205 (circuit) and P0305 (misfire) are its natural companions for the same cylinder. Verify where cylinder 5 sits on your particular engine, since numbering schemes differ between manufacturers and layouts.
P0274 symptoms
- Cylinder 5 misfire, from occasional stumble to fully dead
- Rough idle and vibration through the cabin
- Reduced power and fuel economy
- Check-engine light; flashing means the misfire is active
- Intermittent faults may leave the code with no felt symptoms
What it costs to fix P0274
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 |
Connector and wiring fixes are the inexpensive outcome. Injector replacement costs more, particularly on V-type engines where reaching cylinder 5 means removing the intake manifold, and on direct-injection engines with costlier injectors.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0274 for my exact vehicle →
How to fix P0274
Moderate — doable at home with common tools and patience
- Assess cylinder 5's location and exposure
Cylinder 5 exists only on five-cylinder and larger engines. Where it sits at the rear — the back of an inline six, or the rear bank of a transverse V6 that numbers it there — its connector lives under the cowl, where a blocked cowl drain can drip water onto the terminals and corrode them into a high-resistance fault.
- Get eyes on the injector 5 connector
Use a mirror and flashlight, or remove the cover hiding the rear connectors, and look for white or green deposits, a cracked lock, or a plug that isn't fully seated. Terminals that look clean can still be spread open; if a test pin slides in with no resistance, re-tension or replace them.
- Ohm the control wire from module to injector
With the battery and module connector off, measure the injector 5 control wire end to end using the pinout from the wiring diagram. A healthy wire reads well under an ohm; anything higher, or a reading that flickers while someone flexes the rear harness, tells you the open is in the loom rather than the injector.
- Read injector 5's winding
Measure injector 5 at its terminals and compare with an easy-to-reach injector. Many high-impedance designs read roughly 11–18 ohms; an open or a clearly higher value than its partner condemns the injector, and on a rear-bank V6 cylinder that usually means planning for plenum removal.
- Respect direct-injection circuits
If your engine is direct-injected, the injector drivers use boosted high voltage and the rail runs at very high pressure. Don't back-probe with a test light or noid light; follow the service manual's test steps, and expect new combustion seals and special installation tools if injector 5 has to come out.
DIY or shop? Finding a corroded or loose rear connector and confirming it with a meter is realistic DIY, and clearing a blocked cowl drain costs nothing and prevents a repeat. Whether the repair stays at home depends on access: an inline six or a front-mounted cylinder 5 is manageable, while a rear-bank V6 injector under the plenum, or any direct-injection engine, is shop territory for most owners because of gaskets, torque sequences, seal tooling and high-voltage circuits.
Tools for the DIY steps: Inspection mirror and flashlight · Terminal test probe kit · Digital multimeter · Wiring diagram for your engine · Electrical contact cleaner
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0274.
Start a case with P0274 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 P0274?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0274: common questions
What's the difference between P0274 and P0273?
Same cylinder, opposite voltage fault. P0273 (low) suggests a short to ground or a shorted injector coil; P0274 (high) suggests an open circuit, resistance from corrosion, or a short to battery voltage. The direction narrows where to look first.
Will cleaning my injectors fix P0274?
No — cleaning addresses deposits inside the nozzle, and P0274 is an electrical fault in the circuit that drives the injector. The fix lives in the wiring, the connector, the injector's coil, or occasionally the ECM, not in the fuel system's cleanliness.
Why does the code come back after I clear it?
Because the underlying circuit fault is still there — the ECM re-detects the bad voltage as soon as conditions repeat. If it returns sporadically, suspect a heat- or vibration-sensitive connection like a corroded pin or chafed wire, which a wiggle test can often expose.
Can I drive to work with P0274?
Whether to keep using the car is something this code can't decide for you. Even if the engine runs smoothly, the longer a misfiring cylinder feeds fuel into the exhaust, the greater the risk to the catalytic converter — arrange the repair promptly, and a flashing light means stop driving.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0274 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 P0274 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.