P0276 code: Cylinder 6 Injector Circuit Low
P0276 means cylinder 6 Injector Circuit Low. The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0276 means
P0276 means the ECM measured lower-than-expected voltage on the cylinder 6 injector control circuit — the electrical fingerprint of a short to ground, an open circuit, or an injector coil that has shorted internally. The distinction matters: this monitor watches the circuit, not the spray, so a mechanically clogged injector won't set it. Six-cylinder and larger engines carry this code, and cylinder 6's location differs a lot between an inline-six, a V6, and a V8, so consult your engine's cylinder-numbering diagram before assuming which injector to test. The efficient diagnostic path is comparing cylinder 6's injector resistance and wiring against a known-good cylinder, then swap-testing if results are ambiguous. When the injector actually quits firing, P0206 (cylinder 6 injector circuit) and P0306 (cylinder 6 misfire) commonly store alongside.
P0276 symptoms
- Misfire localized to cylinder 6
- Rough or lumpy idle
- Loss of power, especially noticeable under load
- Check-engine light, possibly flashing during heavy misfire
- Occasionally no symptoms if the circuit fault is intermittent
What it costs to fix P0276
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 |
The spread depends mostly on what fails and where it lives: wiring repairs are cheap, injectors cost more, and V-engines whose rear-bank injectors hide under the intake — or direct-injection engines with pricier injectors — land at the top of the range.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0276 for my exact vehicle →
How to fix P0276
Advanced — usually a shop job unless you’re well equipped
- Work out where cylinder 6 sits on your engine
Six-cylinder and larger engines only. On an inline six it's the last cylinder, closest to the firewall; on V6s it lands on whichever bank the manufacturer's numbering puts it, often deep under the plenum on transverse layouts; V8 schemes vary. Check a diagram so you test the right injector.
- Check the shared injector feed if other codes appear
When several injectors log low or open codes together, test the injector fuse and relay first — on many systems the module senses each control wire through the injector, so a dead shared feed can make every circuit look low. If only cylinder 6 is flagged, the shared feed is probably fine and the fault is local.
- Compare cylinder 6 with its bank-mates
Measure injector 6 and the other injectors on the same bank, at the injectors or through the harness if they're buried. A value clearly below the rest (high-impedance injectors usually land somewhere near 11–18 ohms) singles out a shorted coil; a control wire that also shows continuity to ground with the module unplugged points to the harness instead.
- Check the harness in the engine valley
On V engines the injector harness often runs beneath the upper intake or through the valley, where it can rub on plenum brackets, the fuel-rail crossover and coolant pipes. With the plenum off, look for insulation worn to copper, scorched spots near the exhaust side, and connectors crushed during an earlier intake job.
- Replace injector 6 and watch for a repeat
Fit a matched injector with new seals and plenum gaskets, torque the intake in the specified sequence, then clear codes. If the old injector was shorted, confirm the code stays gone over several drives; a driver stressed by the short can fail later, and only then is the module worth testing.
DIY or shop? Diagnosis up to the fuse, relay and resistance checks is fine for a home mechanic. Actually reaching cylinder 6 is what pushes this to advanced: on many V6 layouts the injector and its harness are under the plenum, and an inline six puts it at the back under cowl panels and hoses. Without intake-removal experience, a torque wrench and a gasket set, it's sensible to stop at diagnosis and let a shop do the teardown.
Tools for the DIY steps: Digital multimeter · Fuse puller and test light · Wiring diagram for your engine · Torque wrench · Intake gasket set · Fuel line disconnect tools
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0276.
Start a case with P0276 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 P0276?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0276: common questions
Does P0276 mean I need a new injector?
Not automatically. The code condemns the circuit, not the injector specifically — wiring shorted to ground and corroded connectors set it just as readily. Test the injector's resistance first; replace it only if it reads shorted, open, or clearly different from the other cylinders.
What's the difference between circuit low and circuit high?
Direction of the voltage error. 'Low' (P0276) usually means a short to ground or a shorted injector coil pulled the circuit voltage down. 'High' (P0277) usually means an open circuit, corrosion resistance, or a short to battery voltage pushed it up.
How risky is driving with P0276?
Redline can't make that call from the code alone. Every mile of active misfire sends raw fuel at the catalytic converter, so arrange the fix promptly. A flashing light means stop driving.
Why do I also see P0306 on my scanner?
P0306 is the misfire code for the same cylinder — the downstream effect of the circuit fault P0276 describes. When both are present, fix the electrical problem first; the misfire code almost always stops returning once the injector fires properly again.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0276 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 P0276 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.