P0276 on 2011-2014 Chevrolet Camaro: Cylinder 6 Injector Circuit Low Causes and Fixes

What's Unique About the 2011-2014 Chevrolet CAMARO

For this generation of Camaro and a wide range of other GM vehicles from the era, a low injector circuit code like P0276 is very frequently a wiring problem, not a component failure. A General Motors Technical Service Bulletin (TSB #PIP4924D) specifically directs technicians to look for a "rub through" condition on the fuel injector wiring harness where it can contact the intake plenum, valve cover bolts, fuel lines, or the side of the cylinder head. This makes a thorough visual inspection of the harness a critical first step, which can prevent the unnecessary cost of replacing a perfectly good fuel injector. Some owners on forums have discovered this chafe issue after installing aftermarket headers which put off more heat and can melt the harness if not properly secured.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light is on (may be flashing in severe cases)
• Rough or shaking idle
• Noticeable loss of power and sluggish acceleration.
• Engine misfires, which may feel like a stumble or hesitation.
• Reduced fuel economy.
• Smell of raw fuel from the exhaust.
• "Service StabiliTrak" message may appear on the driver information center, as engine misfires can disable the traction control system.

Most Likely Causes

1. Damaged Fuel Injector Wiring Harness 🔴 High Probability → Shop Engine Wiring Harness As documented in GM TSB #PIP4924D, the injector wiring harness is known to chafe or rub through its insulation where it contacts engine components. Specific chafe points mentioned in the TSB include against the intake plenum, valve cover bolts, fuel lines, and the side of the cylinder head under the plenum. Owners on forums like Camaro5 have confirmed finding melted or chafed wires on the harness, sometimes after installing aftermarket headers that get closer to the wiring.
   How to confirm: Carefully perform a visual and tactile inspection of the entire fuel injector harness, especially the section running to cylinder 6. On the V6, cylinder 6 is on the driver's side, rearmost position. On the V8, it is the third cylinder back on the driver's side. Look for any signs of abrasion, melting, exposed copper wire, or sections that feel brittle. Wiggle the harness with the engine running to see if it causes a change in the idle.
   Typical fix: Repair the damaged section of the wire. This involves cutting out the bad section, splicing in a new piece of 18-gauge wire, and protecting the repair with solder, heat-shrink tubing, and new loom. 🎬 See how to properly repair and solder damaged harness wiring. Secure the repaired harness away from the source of the chafing using zip ties.
   Est. part cost: $5-$25
2. Faulty Cylinder 6 Fuel Injector 🟡 Medium Probability → Shop Fuel Injector Injectors can fail electrically (internal coil shorts or opens) or become clogged over time. While less common than the wiring issue on this platform, it is still a significant possibility.
   How to confirm: Swap the cylinder 6 fuel injector with one from another cylinder (e.g., cylinder 4). Clear the codes and drive the vehicle. If the code changes to P0270 (Cylinder 4 Injector Circuit Low), the injector is faulty. You can also test the injector's internal resistance with a multimeter. For the 3.6L LFX V6, the resistance should be approximately 1.9-2.3 ohms. For the 6.2L V8 (LS3/L99), the resistance should be approximately 11.2-12.5 ohms. A reading of 0 ohms (short) or infinite ohms (open) indicates a failed injector.
   Typical fix: Replace the faulty fuel injector. Since the V6 is a direct injection engine, replacement is more involved than on the port-injected V8. 🎬 Watch: How to replace fuel injectors on an LS3 or L99 V8 engine. It's often recommended to replace the seals on adjacent injectors and sometimes the high-pressure fuel lines.
   Est. part cost: $50-$160
3. Poor Connection at Injector or ECM ⚪ Low Probability
   How to confirm: Inspect the electrical connector at the cylinder 6 fuel injector and the corresponding pins at the ECM. Look for corrosion, pushed-out pins, or loose connections. The plastic locking tab can become brittle and break, leading to a poor connection.
   Typical fix: Clean the connector terminals with electrical contact cleaner. If the connector itself is damaged, replace it with a new pigtail, such as ACDelco PT2544. This requires cutting the old connector off and splicing the new one in.
   Est. part cost: $15-$40

Rare But Worth Checking

• Faulty Engine Control Module (ECM): → Shop Engine Control Module (ECM) This is the least likely cause. The internal driver circuit for the cylinder 6 injector within the ECM can fail. This should only be considered after all wiring and the injector itself have been proven to be good through testing and swapping.

Diagnosis Steps

1. Scan the vehicle for all stored DTCs. Confirm P0276 is present and note any other codes like P0306.
2. Locate Cylinder 6. On the 3.6L V6, it is the rear-most cylinder on the driver's side (left bank). On the 6.2L V8, it is the third cylinder back on the driver's side.
3. Perform a thorough visual inspection of the fuel injector wiring harness, paying close attention to the path it takes from the main loom to the cylinder 6 injector. Look for any signs of chafing, melting, or damage as indicated by TSB #PIP4924D, especially near the intake, valve covers, and fuel lines.
4. Inspect the electrical connector at the cylinder 6 injector. Check for corrosion, bent or pushed-out pins, and ensure it is seated securely.
5. If the wiring appears intact, swap the cylinder 6 fuel injector with an injector from an adjacent cylinder on the same bank (like cylinder 4).
6. Clear all DTCs, start the engine, and let it run. See if the fault code returns for cylinder 6 (P0276) or if it has moved with the injector to cylinder 4 (now showing P0270).
7. If the code returns as P0276, the problem is in the wiring or ECM. If it moves (P0270), the injector is faulty and needs replacement.
8. To confirm a wiring issue, use a multimeter to check for continuity on the two wires from the injector connector back to the ECM connector. Check for a short to ground on the control wire.
9. Use a noid light at the cylinder 6 injector connector 🎬 Watch: A step-by-step guide to diagnosing injector circuit malfunctions. to verify if the ECM is sending a pulse signal. No pulse points towards a wiring break or a faulty ECM driver.

Parts You'll Likely Need

• Fuel Injector (OEM #12634126 (3.6L V6 LFX), 12576341 (6.2L V8 LS3), 12609418 (6.2L V8 L99)) — This is the part to replace if diagnosis confirms the injector itself has failed. Part numbers differ by engine. The 6.2L V8 uses different injectors for the LS3 (manual) and L99 (automatic) engines; using the wrong one will cause performance issues.
  Trusted brands: ACDelco, Bosch
  OEM price range: $100-$160
  Aftermarket price range: $50-$100
• Fuel Injector Connector Pigtail (OEM #ACDelco PT2544 / GM 13576411) — If the connector at the injector is corroded, melted, or has a broken locking tab, it will need to be replaced to ensure a solid electrical connection. This part is spliced into the existing harness.
  Trusted brands: ACDelco, Dorman
  OEM price range: $25-$40
  Aftermarket price range: $15-$25
• Wire Repair Supplies — Needed to repair a chafed wire in the harness. Includes 18-gauge automotive wire, solder, heat shrink tubing, and Tesa tape or wire loom for protection.
  Trusted brands: 3M
  OEM price range: $10-$25
  Aftermarket price range: $5-$15

Related Codes That Often Appear With This One

• P0306 — This code means 'Cylinder 6 Misfire Detected'. It is a direct symptom of the P0276 fault, as the injector circuit problem prevents proper fueling, causing the cylinder to misfire.
• P0206 — This is a more general 'Injector Circuit/Open - Cylinder 6' code. It can appear alongside P0276 depending on the specific nature of the electrical fault.

Technical Service Bulletins (TSBs) & Recalls

• PIP4924D: Mentions that for a variety of injector codes including P0276, the technician should inspect the fuel injector wiring harness for rub through or internal damage. Specific inspection points include against the intake plenum, valve cover bolts, fuel lines, and the side of the head.

Platform-Specific Known Issues

• A known issue, documented in TSB #PIP4924D, involves the fuel injector wiring harness rubbing through its insulation against engine components, leading to a short circuit and triggering codes like P0276.
• Owners on forums like Camaro5 have reported the harness melting after installing aftermarket long-tube headers, which can sit closer to the wiring than the stock manifolds.

Mechanic-Grade Diagnostic Values

• Fuel Injector Resistance (6.2L V8 LS3/L99) — expected: 11.2 - 12.5 Ohms. Failure: A reading of 0 ohms (short), infinite/OL (open), or a value significantly different from the other injectors.
• Fuel Injector Resistance (3.6L V6 LFX) — expected: 1.9 - 2.3 Ohms. Failure: A reading outside this range indicates an internal fault in the direct injector's coil.
• Injector Circuit Voltage (Key On, Engine Off) — expected: Battery Voltage (approx. 12V) on the power supply wire at the injector connector.. Failure: Low or no voltage indicates a problem with the power feed circuit, fuse, or relay.

Scan Tool Commands That Help

• GDS2 (GM Factory Tool): Injector Balance Test / Cylinder Power Balance — This function allows a technician to disable individual injectors one by one while the engine is running. If disabling cylinder 6 causes no change in engine RPM or smoothness, it confirms that cylinder was not contributing in the first place. It can also command the injector to fire and measure the corresponding drop in fuel rail pressure, which should be consistent across all cylinders.

Wiring & Ground Locations

• K20 (ECM) Connector X2, Pin 19 — The Engine Control Module (ECM) is located in the right front of the engine compartment. Pin 19 on the X2 connector is for the Cylinder 6 Injector Control.. This is the specific pin to test for continuity and shorts when diagnosing a wiring fault between the ECM and the fuel injector. The wire color is typically Yellow/Black.
• G105 / G106 — These are primary engine compartment ground points located on the frame rails in the front of the engine bay, behind the headlamps.. The ECM and its related components rely on clean, solid grounds. A corroded or loose G105/G106 ground can cause a variety of erratic electrical issues, including intermittent low voltage faults on sensor and actuator circuits.
• G103 / G107 — Grounds located on the rear of the cylinder heads.. These are critical grounds for the engine block and ignition system. While less likely to cause a single injector code, a poor connection here can lead to widespread engine control problems and misfires.

Real Owner Repair Stories

• Camaro5 forum user reports (2011-2014 Camaro SS (6.2L V8)) — P0276 and P0306, rough idle, loss of power.
  ❌ Tried (didn't work) Replacing the cylinder 6 fuel injector., Replacing the cylinder 6 spark plug and ignition coil.
  ✅ What actually fixed it In one case, a wire for the cylinder 6 injector was found to be broken internally, inside the insulation, about an inch from the connector. The wire looked perfect visually but failed a continuity 'pull test'. Repairing the broken wire resolved the code. In another similar case, the injector harness had melted against a newly installed aftermarket header, causing a short to ground. Repairing the melted wires and securing the harness away from the heat source fixed the issue.

OEM Part Supersession History

• 12634126 → 12642128, and then back to 12634126 being the current service part. — Minor revisions for reliability or manufacturing changes for the 3.6L LFX V6 direct injector.
  Heads up: Part number 12634126 is specific to GM's GDI V6 engines and is not interchangeable with the V8 port injectors.

Model Year Variations Within This Range

• 2011-2014 (V8 Models): The 6.2L V8 engine came in two primary forms tied to the transmission: the LS3 (manual transmission) and the L99 (automatic transmission). They use different fuel injectors. The LS3 uses part number 12576341, while the L99 (which has Active Fuel Management) uses 12609418. They have different flow characteristics and are not interchangeable.