P0276 Code Fix: Cylinder 6 Injector Circuit Low (Wiring First)

What Does P0276 Mean?

The engine fires each fuel injector on a command from the Powertrain Control Module. On a port-injection system the injector has two wires. One carries a switched 12V feed shared across the injectors. The other is the control wire, which the PCM connects to ground for a few milliseconds to fire the injector: current runs through the injector's coil, the pintle lifts, and fuel sprays. The PCM watches that circuit electrically on every shot. P0276 is the code for the cylinder 6 injector when the PCM sees the circuit go low or open and the expected current never flows.

"Low" describes the electrical state of the circuit, not the amount of fuel. When the PCM drives the injector and the feedback stays low or reads open, it cannot confirm the injector energized. The short list of reasons: a broken or high-resistance wire, a connector that is not making clean contact, an injector coil that has gone open, or a failed driver transistor inside the PCM. P0276 belongs to a family of per-cylinder injector codes. P0270 and P0273 are the Low codes for cylinders 4 and 5, and P0271, P0274, and P0277 are the matching High codes.

Here is the part that saves money. A circuit has three pieces: the injector, the wiring, and the connector that joins them. The label "injector circuit" pushes people toward the injector, but the connector and wiring fail more often than the coil does, especially on cylinder 6, which on many V6 and V8 engines sits in a hot, vibration-heavy spot at the back of a bank. A corroded connector or a chafed wire produces the same P0276 a dead injector would. The job is to find which of the three pieces failed, and that test costs nothing.

What Are the Symptoms of P0276?

Symptoms depend on whether cylinder 6 is firing intermittently or has stopped. A full open circuit kills the cylinder and the symptoms are obvious. An intermittent connector comes and goes:

Is P0276 Serious?

Moderate to high. A dead cylinder 6 puts the catalytic converter at risk, so handle it within about a week.

The mechanical urgency is real. When cylinder 6 stops firing, unburned fuel and oxygen pass into the exhaust, and a sustained misfire can overheat and ruin the catalytic converter, which costs far more than the P0276 repair behind it. The financial risk runs the other way: the frequent error is paying for an injector that was never bad. Handle the code quickly, but spend the free ten minutes confirming whether the fault is wiring, connector, or injector before buying parts.

What Causes a P0276 Code?

The list below runs from most common to rarest. The connector and wiring sit at the top, and the injector itself is further down than most people expect.

What You'll Need

How Do You Fix a P0276 Code?

Work the steps in order. Step 2, the coil-resistance test, separates a bad injector from bad wiring in five minutes and is the one most people skip.

• 1

  Scan All Codes and Note the Companions

  Record every code. P0276 often travels with P0206 (Injector Circuit/Open, Cylinder 6), P0277 (Cylinder 6 High), P0278 (Cylinder 6 Contribution/Balance, a fuel-flow code), P0306 (Cylinder 6 Misfire), P0300 (Random Misfire), and P0200 (generic Injector Circuit/Open). P0276 alone points to an electrical circuit fault. P0276 with P0306 means the injector is electrically dead and cylinder 6 is misfiring. P0276 on several cylinders points to a shared feed or ground, or the PCM. Clear the codes and restart: if it returns at once, a hard fault exists, so go to Step 2; if it stays gone, clean and re-seat the connector as cheap insurance.

  A reader that shows P0276 next to a pile of unrelated codes usually means a shared power or ground problem. Chase the feed and ground, not six injectors.
• 2

  Injector Coil Resistance Test

  This is the test that decides injector versus wiring. Unplug the cylinder 6 injector connector, set the meter to ohms, and measure across the injector's two terminals. Saturated injectors read about 12 to 17 ohms; peak-and-hold and many GDI injectors read about 1 to 3 ohms; confirm the figure in the service manual. A reading of OL or infinite means an open coil, so replace the injector. A reading inside spec means the injector is healthy and the fault is in the connector, wiring, or PCM, so leave it alone and go to Step 3. A reading near zero means a shorted coil, though a hard short usually sets P0277. Write the reading down. An in-spec number is what keeps you from buying an injector you do not need.

• 3

  Inspect the Connector and Pins

  A failing connector causes P0276 more often than a failing injector. Check the cylinder 6 connector for green or white corrosion, oil or coolant intrusion, melted plastic, and a cracked locking tab. Probe each terminal for tension, since loose or splayed pins drop contact under heat and vibration. Reconnect and run a wiggle test with the engine running or live data on screen, moving the connector and harness while you watch cylinder 6. Clean the terminals with contact cleaner, re-tension the pins or fit a new pigtail, add dielectric grease, and seat the connector until it clicks.

  Heat-soak near the exhaust on V6 and V8 engines is the usual reason a cylinder 6 connector degrades. A clean-up here runs $0 to $40 and resolves a large share of cases.
• 4

  Test the Wiring, Feed, and Ground

  With the injector and connector cleared, test the circuit. Back-probe the feed wire with the key on and expect battery voltage within half a volt; no voltage points to an open feed, a blown injector fuse, or a relay fault. With the connector unplugged and the key off, check continuity from the injector control pin to the PCM connector, where an open or high-resistance wire sets P0276. Check the control wire for a short to ground or to 12V at chafe points over the head and intake. A noid light in the cylinder 6 connector should flash steadily on crank, which proves the PCM is driving the circuit and the harness is intact. Confirm the PCM grounds read under 0.5 ohms, and repair any broken or chafed wire with solder and heat-shrink.

• 5

  Swap the Injector to Confirm

  Run this cross-check before spending money. Swap the cylinder 6 injector with a known-good one from another cylinder, clear the codes, and re-scan. If the fault follows the injector, with a Low code now on the cylinder you moved it to, the injector has failed and you replace it. If P0276 stays on cylinder 6 after the swap, the injector is fine and the fault is the connector, wiring, or PCM. The swap takes the guesswork out of the decision to buy a part.

• 6

  PCM Injector Driver, Last Resort

  If Steps 2 through 5 clear the injector, connector, and wiring, and a noid light shows no drive pulse on cylinder 6, the PCM's injector driver may have failed. This is the rarest outcome. Before authorizing PCM work, document an in-spec coil reading, a clean connector with good pin tension, battery voltage on the feed, continuity to the PCM with no short, and no drive pulse at the connector on crank. Some specialists repair the driver transistor; otherwise the PCM is reflashed or replaced and programmed to the VIN, $300 to $1,200 with programming. BMW, VW, and some GM platforms need dealer programming.

How Much Does P0276 Cost to Fix?

The cost swings from nothing, for a cleaned connector, to about $1,200 for a PCM driver. The free coil-resistance and swap tests decide which end you land on before any parts are bought.

A vehicle with an active P0276 and misfire fails OBD-II emissions inspection in most states, and a sustained cylinder 6 misfire can damage the catalytic converter. Per the EPA Vehicle Emissions I/M Program, emissions parts are covered under the federal emissions warranty for the first 8 years or 80,000 miles on many vehicles, so verify coverage with your dealer by VIN before paying out of pocket on a newer car.

Which Vehicles Are Most Prone to P0276?

P0276 can show up on any engine with a cylinder 6, whether inline-6, V6, or V8. GM 5.3L and 6.2L V8 trucks, the Ford 3.5L EcoBoost V6, and BMW inline-six engines are where it surfaces most. Platform notes follow the table.

P0276 on GM 5.3L and 6.2L V8 Trucks

On the Silverado, Sierra, Tahoe, and Suburban V8s, cylinder 6 sits in a hot zone, and connector heat-soak is the usual cause. Years of heat cycling relax the terminal tension and produce the intermittent low or open circuit P0276 describes, so a clean-and-repin runs $0 to $40. Harness chafe over the head shows up as an open circuit and gets a solder-and-heat-shrink repair. A genuinely open injector coil happens on these engines but is the minority case, so confirm it with the Step 2 resistance test and the Step 5 swap before buying.

P0276 on Ford 3.5L EcoBoost and 3.7L V6

On EcoBoost and 3.7L V6 engines, the high-pressure direct-injection connectors are sensitive to corrosion in the under-cowl area, so clean or replace the connector and add dielectric grease. Tight harness routing creates chafe points against the head and intake. A GDI injector costs more than a port injector, $150 to $500 for the part, so confirming injector versus wiring with the coil test and swap saves the most here.

P0276 on BMW N52, N54, N55, and B58 Inline-6

BMW inline-sixes see P0276 mostly from injector connector pin-tension loss, where cylinder 6 drops contact under heat and vibration even though the connector looks fine, so re-tension or replace the terminals. Salt-belt corrosion raises the pin-corrosion rate. BMW dealer rates make an unnecessary injector job costly, so the free coil and swap tests pay off the most on these cars.

Should You DIY or Call a Mechanic?

Related Codes You May See With P0276

Frequently Asked Questions