P0264 on 2009-2010 Saturn Outlook: Cylinder 2 Injector Circuit Low Causes and Fixes

What's Unique About the 2009-2010 Saturn OUTLOOK

The 2009-2010 Saturn Outlook uses a 3.6L V6 (LLT) Spark Ignition Direct Injection (SIDI) engine and shares its GM Lambda platform with the Chevrolet Traverse, GMC Acadia, and Buick Enclave. This platform is known for issues with the fuel injector wiring harness. A specific GM Technical Service Bulletin (TSB #PIP4924D) addresses numerous injector circuit codes, including P0264, that can be caused by the harness chafing against engine components like the intake plenum, valve cover bolts, or fuel lines. This makes a thorough wiring inspection a critical first step before condemning the fuel injector itself, as the repair is often the wire and not the component.

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
• Rough or uneven idle.
• Engine misfire, which may feel like a shake or stumble
• Loss of power and hesitation during acceleration.
• Reduced fuel economy
• "Service Stabilitrak", "Service Traction Control", and "Reduced Engine Power Mode" messages on the dash.

Most Likely Causes

1. Fuel Injector Wiring Harness or Connector Damage 🔴 High Probability → Shop Engine Wiring Harness As documented in TSB #PIP4924D, the injector wiring harness is known to rub against engine components. Specific chafe points include the intake plenum, valve cover bolts, fuel lines, and the side of the cylinder head under the plenum. Constant engine vibration wears through the protective loom, exposing the injector control wire and causing it to short to ground.
   How to confirm: Visually inspect the entire wiring harness leading to the Bank 2 fuel injectors, paying close attention to the known chafe points. Look for bare wires, scuff marks on the loom, or corrosion on the connector pins. A 'wiggle test' on the harness while the engine is running may trigger or change the misfire. A borescope can be helpful for inspecting hard-to-see areas under the intake manifold.
   Typical fix: Repair the damaged section of the wiring harness using solder and heat-shrink tubing. Secure the repaired harness away from any sharp edges or contact points with zip ties. If the connector is damaged, replace it with a new pigtail connector (e.g., ACDelco PT2183).
   Est. part cost: $15-$50
2. Faulty Cylinder 2 Fuel Injector 🟡 Medium Probability → Shop Fuel Injector The 3.6L V6 uses direct injection (SIDI), where injectors operate under very high pressure and are susceptible to both electrical failure and carbon buildup. Over time, the internal coil windings can short out or fail, causing an electrical fault.
   How to confirm: Swap the cylinder 2 injector with an injector from another cylinder (e.g., cylinder 4). Clear the codes and run the engine. If the code changes to P0270 (Cylinder 4 Injector Circuit Low), the injector is faulty. Alternatively, disconnect the injector and measure its resistance with a multimeter; for a GDI injector on the LLT engine, it should be very low, around 1.1-2.0 ohms. A reading of 0 or infinity indicates a failed injector.
   Typical fix: Replace the failed fuel injector. Since this requires removing the intake manifold, it is often recommended to replace all three injectors on that bank (Bank 2: cylinders 2, 4, 6) at the same time, along with their Teflon seals. 🎬 See this walkthrough for replacing GM 3.6L direct injectors.
   Est. part cost: $50-$150
3. Faulty Powertrain Control Module (ECM) ⚪ Low Probability → Shop Engine Control Module (ECM)
   How to confirm: This should be the last step after confirming the injector and wiring are good. A professional shop can perform advanced diagnostics to test the injector driver circuit within the ECM. A scan tool may be able to command an injector driver self-diagnostic.
   Typical fix: The ECM must be replaced and programmed to the vehicle's VIN.
   Est. part cost: $300-$800

Diagnosis Steps

1. Use an OBD-II scanner to confirm P0264 is the active code and check for any other related codes, 🎬 Watch: Understanding the P0264 injector circuit low diagnostic code. like P0302.
2. Perform a detailed visual inspection of the fuel injector wiring harness for any signs of chafing, melting, or corrosion, focusing on the specific areas mentioned in TSB PIP4924D (against the intake plenum, valve cover bolts, fuel lines).
3. Inspect the electrical connector at the cylinder 2 injector for loose pins, corrosion, or damage.
4. If wiring appears okay, perform an injector swap test. This requires removing the upper intake manifold. 🎬 Watch: Step-by-step guide to removing the LLT intake manifold. Label and swap the cylinder 2 fuel injector with the cylinder 4 fuel injector.
5. Clear the codes and start the engine. If the code returns as P0270 (Cylinder 4 Injector Circuit Low), the fuel injector is confirmed to be faulty.
6. If the code remains P0264 after the swap, the problem lies in the wiring or the ECM.
7. Use a noid light on the cylinder 2 injector connector. Crank the engine; a flashing light indicates the ECM is sending a pulse. No light or a steady light points to a wiring or ECM issue.
8. Use a multimeter to check for continuity on the injector control wire between the ECM connector and the injector connector. Check the same wire for a short to ground.
9. If the injector and wiring have both been ruled out, the fault is likely with the ECM's internal injector driver, which requires professional diagnosis or replacement.

Parts You'll Likely Need

• Fuel Injector (OEM #12638530, Superseded by 12669384) — This is a common part to fail internally, causing the electrical circuit fault. The original part number 12638530 has been replaced by 12669384.
  Trusted brands: ACDelco, Bosch
  OEM price range: $90-$140
  Aftermarket price range: $50-$90
• Intake Manifold Gasket Set (OEM #12617944) — The intake manifold must be removed to access the fuel injectors. The gaskets are single-use and must be replaced to prevent vacuum leaks.
  Trusted brands: Fel-Pro, ACDelco
  OEM price range: $40-$70
  Aftermarket price range: $20-$40
• Fuel Injector Connector Pigtail (OEM #ACDelco PT2183 (GM 88988963)) — If the wiring harness is damaged at the connector, replacing the connector pigtail is the standard repair.
  Trusted brands: ACDelco, Dorman
  OEM price range: $25-$40
  Aftermarket price range: $15-$25

Related Codes That Often Appear With This One

• P0302 — This code means 'Cylinder 2 Misfire Detected'. A P0264 fault directly prevents proper fueling for cylinder 2, which is a primary cause for it to misfire.
• P0261, P0267, P0270, etc. — If the wiring harness is chafing, it's common for multiple injector wires to be damaged at the same time, leading to circuit low/high codes for other cylinders on the same bank (Bank 2 includes cylinders 2, 4, and 6).
• P0300 — This code for 'Random/Multiple Cylinder Misfire' can appear if the single-cylinder misfire is severe enough to affect overall engine balance and stability.

Technical Service Bulletins (TSBs) & Recalls

• PIP4924D: Addresses engine misfires and various fuel injector diagnostic trouble codes (including P0264, P0261, P0267, etc.) that can be caused by wiring harness issues. It instructs technicians to inspect the harness for rubbing against the intake plenum, valve cover bolts, fuel lines, and the side of the cylinder head.

Platform-Specific Known Issues

• A known issue documented in GM Technical Service Bulletin #PIP4924D involves the fuel injector wiring harness chafing against various engine components, leading to shorts or open circuits. This bulletin applies to a wide range of injector codes, including P0264.
• Real Owner Experience: Misfire on Cylinders 2, 4, 6: A user on Pelican Parts Forum working on a Saturn Outlook that had sat for a year experienced horrible running, misfires on cylinders 2, 4, and 6, and extremely high fuel pressure. After pulling the intake, they found the intake ports for those cylinders were black and wet, indicating a severe fueling issue on that entire bank. While not explicitly P0264, it highlights how issues can cluster on Bank 2.

Mechanic-Grade Diagnostic Values

• Fuel Injector Coil Resistance (3.6L LLT Engine) — expected: 11.8 - 12.6 Ohms. Failure: A reading significantly outside this range, or OL (Open Loop), indicates a failed injector. Note: This is for the 2009-2011 LLT engine; the later LFX engine uses a much lower resistance injector (1.2-1.8 Ohms).
• Low-Pressure Fuel System Pressure — expected: 380-410 kPa (55-60 psi) at idle, checked at the fuel rail test port.. Failure: Pressure significantly below this range could indicate a weak in-tank fuel pump, while pressure above could indicate a regulator issue. This is not a direct cause of an electrical code but is crucial for overall fuel system health.
• Cylinder 2 Injector Control Wires (at ECM) — expected: Pin 52 (Dark Blue) is the low-side control. Pin 53 (Dark Blue with White tracer) is the high-side control.. Failure: Testing for continuity to ground and between these pins and the injector connector can definitively isolate a wiring fault from an ECM or injector fault.

Scan Tool Commands That Help

• GM Tech 2 / GDS2: Fuel Injector Balance Test — This special function commands the ECM to pulse each injector individually while monitoring the fuel pressure drop. If the pressure drop for cylinder 2 is significantly different from the others, it confirms a flow issue with that injector. This can also be used to identify leaking injectors.
• GM Tech 2 / GDS2: Cylinder Power Balance — This test allows the scan tool to disable one cylinder at a time to gauge its contribution to engine speed. If disabling cylinder 2 results in no change in engine RPM or feel, it confirms that cylinder was not contributing, which is expected with a P0264 fault.
• Kent Moore J-44644 (AFIT): Active Fuel Injector Tester (AFIT) — This is a dealership-level tool that performs an automated and more precise injector flow test by cranking the engine and analyzing data. It can definitively identify a faulty injector.

Wiring & Ground Locations

• G110 — Right front of the engine, mounted to the cylinder head.. This is a primary ground point on the engine itself. A poor connection here can cause a variety of electrical issues, including erratic behavior from sensors and modules controlled by the ECM.
• G113 — Left side of the engine, at the engine-to-transmission stud.. Another critical engine ground. The ECM relies on solid engine grounds to provide a stable reference for its drivers. A fault here could potentially cause voltage drop issues that might be misinterpreted by the ECM.
• G101 — Left side of the engine compartment, on the left frame rail.. This ground serves the Engine Control Module (ECM) and Transmission Control Module (TCM). A compromised G101 is a significant potential source of intermittent and hard-to-diagnose electrical faults, including injector circuit codes.
• ECM Connector X1, Pins 52 & 53 — At the Engine Control Module (ECM) in the engine bay.. These are the specific terminals for the Cylinder 2 injector. Pin 52 (Dark Blue wire) is the low-side driver and Pin 53 (Dark Blue/White wire) is the high-side driver. Probing these pins is the most direct way to test the ECM's output and the integrity of the wiring harness back to the injector.

Real Owner Repair Stories

• traverseforum.com (2011 Chevrolet Traverse (platform mate)) — P0264 code and rough running engine.
  ❌ Tried (didn't work) Initial assumption was a bad fuel injector.
  ✅ What actually fixed it The owner removed the intake manifold and found a wire in the harness had rubbed through on a metal bracket at the back of the engine. The final fix was repairing the damaged wire and securing the harness away from the bracket, confirming the real-world applicability of TSB #PIP4924D.

OEM Part Supersession History

• 12632255 → 12638530 — Standard part revision. Part 12638530 replaced 12632255 in March 2011 for the US market.
• 12638530 → 12669384 — Standard part revision for improved reliability or manufacturing process.
  Heads up: 12669384 is the current direct replacement for 12638530 and is fully compatible for the 3.6L LLT engine.

Model Year Variations Within This Range

• 2009-2010: The 2009-2010 Saturn Outlook uses the 3.6L LLT V6 engine. This is important because its direct fuel injectors are a high-impedance design (approx. 11.8-12.6 Ohms). Later GM models (2012+) with the LFX V6 use low-impedance injectors (approx. 1.2-1.8 Ohms). Using diagnostic values or parts from the wrong engine generation will lead to misdiagnosis.