P0276 on 2009-2010 Saturn VUE: Cylinder 6 Injector Circuit Low Causes and Fixes

What's Unique About the 2009-2010 Saturn VUE

The 2009-2010 Saturn VUE, which shares its platform with other GM vehicles like the Chevrolet Traverse and GMC Acadia, is specifically mentioned in GM Technical Service Bulletin #PIP4924D for injector circuit codes. The TSB highlights a known issue with the fuel injector wiring harness rubbing through or having internal breaks. Owners and technicians report these chafe points commonly occur where the harness contacts the intake plenum, valve cover bolts, fuel lines, or the side of the cylinder head. Another critical chafe point is where the harness passes over the sharp metal edge of the ECM mounting bracket in the left-front of the engine bay. This makes a targeted wiring inspection a critical first step on this vehicle, potentially saving you from unnecessarily replacing a good fuel injector.

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 or flashing
• Rough or shaky idle
• Reduced engine power and poor acceleration
• Engine hesitation or stumbling
• Decreased fuel economy
• A noticeable vibration or misfire from the engine
• Engine stalling

Most Likely Causes

1. Damaged Fuel Injector Wiring Harness 🔴 High Probability → Shop Engine Wiring Harness A GM Technical Service Bulletin (PIP4924D) specifically calls out the fuel injector wiring harness for potential 'rub through or internal' wire damage on this platform, leading to various injector circuit codes including P0276. Engine vibration causes the harness to chafe against sharp edges.
   How to confirm: Visually inspect the entire fuel injector wiring harness, especially where it might contact the engine. Common chafe points are against the intake plenum, valve cover bolts, fuel lines, the side of the cylinder head under the plenum, and the metal ECM mounting bracket. Look for chafed, melted, or broken wires. Use a multimeter to check for continuity and shorts to ground on the wires leading to the cylinder 6 injector.
   Typical fix: Repair the damaged section of the wire by splicing in a new piece and protecting it with heat-shrink tubing and abrasion-resistant tape. If damage is close to the connector, replace the injector connector pigtail. In severe cases, the entire engine wiring harness may need replacement.
   Est. part cost: $10-$50
2. Faulty Cylinder 6 Fuel Injector 🟡 Medium Probability → Shop Fuel Injector
   How to confirm: After confirming the wiring is good, check the injector's internal resistance with a multimeter. For the 3.6L LLT (Direct Injection) engine, the resistance should be very low, approximately 1.5-2.5 ohms. For the 3.5L LZ4 (Port Injection) engine, it's much higher at 11-16 ohms. A reading significantly outside the expected range, or a reading of zero/infinity, indicates a failed injector. Alternatively, swap the cylinder 6 injector with another one (e.g., cylinder 4). If the code changes to P0270 (for cylinder 4), the injector is faulty.
   Typical fix: Replace the failed fuel injector. It is often recommended to replace all injectors as a set if they are high-mileage to ensure balanced fuel delivery.
   Est. part cost: $50-$165
3. Loose or Corroded Injector Connector ⚪ Low Probability
   How to confirm: Inspect the electrical connector at the cylinder 6 fuel injector. Check for a loose fit, pushed-out pins, or any signs of green or white corrosion. Check for proper terminal tension.
   Typical fix: Clean the connector terminals with electrical contact cleaner and apply dielectric grease to prevent future corrosion. Ensure it is securely plugged in. If the connector or its pins are damaged, replace the connector pigtail (e.g., ACDelco PT2183 / GM 88988963).
   Est. part cost: $10-$49

Rare But Worth Checking

• Faulty Powertrain Control Module (ECM): → Shop Engine Control Module (ECM) This should be the last consideration after all wiring and component checks have been exhausted. An ECM failure for a single injector driver is uncommon but possible. Before replacing the ECM, verify that the driver circuit is indeed faulty 🎬 Watch: Advanced 3.6L direct injection circuit testing and scope captures using an advanced scan tool or oscilloscope.

Diagnosis Steps

1. Use an OBD-II scanner to confirm P0276 is the primary code and check for any other codes, like P0306.
2. Identify Cylinder 6. On the 3.6L V6, it is the passenger-side cylinder on the bank closest to the radiator. On the 3.5L V6, it is the passenger-side cylinder on the bank closest to the firewall.
3. Perform a thorough visual inspection of the fuel injector wiring harness, paying close attention to the known chafe points outlined in TSB PIP4924D: against the intake plenum, valve cover bolts, fuel lines, the side of the cylinder head, and the ECM mounting bracket.
4. Disconnect the cylinder 6 fuel injector and inspect the connector for damage, pushed-out pins, or corrosion.
5. Use a multimeter to measure the internal resistance of the cylinder 6 fuel injector. For the 3.6L LLT engine, compare it to the specification of ~1.5-2.5 ohms. For the 3.5L engine, expect ~11-16 ohms. A reading that is significantly out of spec points to a bad injector.
6. Perform a 'noid light' test on the cylinder 6 injector connector. The light should flash consistently when the engine is cranked, indicating the ECM is sending a pulse signal. If it doesn't flash or is very dim, the problem is in the wiring or the ECM.
7. If the wiring and signal are good, but the injector resistance was questionable, swap the cylinder 6 injector with another cylinder's injector (e.g., cylinder 4). Clear the codes and run the engine. If the fault code moves to P0270 (Cylinder 4), the injector is confirmed to be the problem.
8. If the code remains P0276 after swapping the injector, the problem lies in the wiring harness (possibly an intermittent short) or the ECM itself.

Parts You'll Likely Need

• Fuel Injector (OEM #12592648) — This is the component that fails if the wiring harness is found to be in good condition. It's the second most likely cause of the P0276 code. The part number for the 3.6L V6 (LLT engine) is often cited as 12592648 or the ACDelco equivalent 217-2299.
  Trusted brands: ACDelco, Bosch, Delphi
  OEM price range: $55-$165
  Aftermarket price range: $40-$90
• Fuel Injector Connector Pigtail (OEM #ACDelco PT2183 / GM 88988963) — Used to repair a damaged, corroded, or melted connector at the fuel injector, which can cause the 'Circuit Low' condition. This is a common repair when the wiring damage is right at the connector.
  Trusted brands: ACDelco, Dorman, Standard Motor Products
  OEM price range: $25-$49
  Aftermarket price range: $10-$25

Related Codes That Often Appear With This One

• P0306 — P0306 means 'Cylinder 6 Misfire Detected'. This code frequently appears with P0276 because a malfunctioning injector circuit prevents proper fueling, causing that cylinder to misfire.
• P0206 — P0206 means 'Injector Circuit/Open - Cylinder 6'. This is another injector circuit code that can be caused by the same wiring harness issue, indicating an open circuit instead of a low voltage/short condition.
🎬 See this breakdown of causes and fixes for P0206 codes

Technical Service Bulletins (TSBs) & Recalls

• PIP4924D: Addresses multiple fuel injector circuit codes (including P0276) and directs technicians to inspect the fuel injector wiring harness for rub-through or internal opens. This is the primary document for this issue.

Platform-Specific Known Issues

• A known issue documented in GM TSB #PIP4924D involves the fuel injector wiring harness chafing or developing an internal open circuit, which is a primary cause for this code on the 2009-2010 Saturn VUE and related GM platforms. Specific inspection points are where the harness routes near the intake plenum, valve cover bolts, fuel lines, and the ECM mounting bracket.

Mechanic-Grade Diagnostic Values

• Fuel Injector Resistance (3.6L V6 LLT Direct Injection) — expected: 1.5 - 2.5 Ohms. Failure: A reading near zero (short) or infinity (open). A reading outside this range indicates a faulty injector coil.
• Fuel Injector Resistance (3.5L V6 LZ4 Port Injection) — expected: 11 - 16 Ohms. Failure: A reading significantly outside this range, especially when compared to other injectors on the engine.
• Fuel Pressure (Key On, Engine Off) — expected: 345-414 kPa (50-60 psi). Failure: Pressure should not decrease more than 34 kPa (5 psi) in 1 minute. A rapid drop indicates a leak in the system (e.g., injector, fuel line).
• Fuel Pressure (Engine Idling, Warm) — expected: 296 - 310 kPa (43 - 45 psi). Failure: Pressure outside this range at idle can indicate a problem with the fuel pressure regulator or pump.
• Injector Control Voltage (on Oscilloscope - 3.6L DI) — expected: An initial inductive kick/voltage spike to ~65V to open the injector, followed by a lower hold voltage (~12V).. Failure: Absence of the initial high-voltage spike or a signal that is stuck low (at or near 0V) points to a wiring short or a failed ECM driver.

Scan Tool Commands That Help

• GM GDS2 / Tech2: Injector Balance Test / Active Fuel Injector Test (AFIT) — Use this after confirming the wiring is intact. This function commands each injector to fire individually and measures the corresponding drop in fuel rail pressure. If cylinder 6 shows a significantly different pressure drop than the others, it confirms the injector is mechanically or electrically faulty, helping to avoid unnecessary parts replacement.

Wiring & Ground Locations

• ECM Mounting Bracket — Left front of the engine compartment, where the Engine Control Module (ECM) is mounted.. This is a critical and documented chafe point. Engine vibration can cause the injector harness to rub against the sharp metal edge of this bracket, shorting the cylinder 6 injector control wire to ground.
• G107 — At the rear of the engine.. This is a primary engine ground. A loose or corroded connection here can cause erratic voltage and signal issues for multiple engine components, including the injector circuits.
• G108 — Behind the left (driver's side) headlight assembly.. This is another key ground point for the engine harness. Poor contact can lead to intermittent electrical faults that are hard to trace.
• X160 / X161 Connectors — Located at the rear of the intake manifold.. These are main pass-through connectors for the engine harness. Corrosion or pushed-out pins within these connectors can cause an open or high resistance on the injector circuit.

"I Checked Everything" — The Actual Cause

• A common scenario for P0276 on this platform is a wiring short that is intermittent and only occurs with engine vibration. A technician may perform a continuity test on the injector harness with the engine off and find no fault (test is 'clean'). The actual cause is the injector control wire intermittently grounding against the ECM bracket or a valve cover bolt when the engine is running. The fix is to perform a 'wiggle test' on the harness with the engine idling to try and replicate the fault, then physically inspect and repair the chafed wire as per TSB PIP4924D.

OEM Part Supersession History

• 12579332 → 12592648 — Standard part revision for improved reliability or manufacturing process.

Model Year Variations Within This Range

• 2009-2010: The VUE was available with a 3.5L V6 (LZ4, Port Injection) and a 3.6L V6 (LLT, Direct Injection). This is a critical difference for diagnosis. The 3.5L uses high-resistance injectors (~11-16 Ohms), while the 3.6L uses low-resistance injectors (~1.5-2.5 Ohms). Fuel pressure specs also differ. Using the wrong resistance value during testing will lead to a misdiagnosis.