P0274 on 2009-2010 Saturn VUE: Cylinder 5 Injector Circuit High Causes and Fixes

What's Unique About the 2009-2010 Saturn VUE

This code is only applicable to V6-equipped Saturn VUE models, as the four-cylinder engines do not have a fifth cylinder. The key issue for this platform, particularly models with the 3.6L LLT V6 engine, is a widespread problem with the fuel injector wiring harness. General Motors issued Technical Service Bulletin #PIP4924D, which specifically includes the 2009-2010 Saturn VUE and its platform mates (like the Chevy Traverse and GMC Acadia), warning technicians that the harness is prone to rubbing through its insulation. This chafing, often against the intake plenum or valve cover bolts, causes electrical shorts that trigger codes like P0274.

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 if misfire is severe)
• Rough or uneven engine idle
• Engine misfire or stumbling, especially under light load
• Noticeable loss of power during acceleration
• Reduced fuel economy
• Potential fuel smell from unburnt fuel in the exhaust

Most Likely Causes

1. Chafed/Damaged Fuel Injector Wiring Harness 🔴 High Probability → Shop Engine Wiring Harness This is a well-documented issue covered by GM Technical Service Bulletin #PIP4924D. The harness routing on the 3.6L V6 makes it susceptible to rubbing against engine components like the intake plenum, valve cover bolts, and fuel lines, leading to exposed wires and shorts.
   How to confirm: Visually inspect the entire fuel injector wiring harness, especially where it runs near or touches the intake plenum, valve cover bolts, fuel lines, and the side of the cylinder head. The damage may be on the underside of the loom and not immediately visible. Feel along the harness for any brittle, melted, or abraded sections.
   Typical fix: Repair the damaged section of the wire by splicing in a new piece and protecting it with heat-shrink tubing. Re-route or secure the harness with zip ties to prevent future rubbing. If damage is extensive or at the connector, a new pigtail (e.g., ACDelco PT2160) may be needed.
   Est. part cost: $10-$40 for repair materials or a new pigtail connector.
2. Faulty Cylinder 5 Fuel Injector 🟡 Medium Probability → Shop Fuel Injector The 3.6L LLT engine uses direct injection, and its injectors can fail internally, causing an electrical short. While less common than the wiring issue, it's the next logical suspect.
   How to confirm: If the wiring is confirmed to be intact, the injector is the next suspect. A mechanic can test the injector's internal resistance with a multimeter. A common DIY method is to swap the cylinder 5 injector with an adjacent one (e.g., cylinder 3). If the code changes to P0268 (Cylinder 3 Injector Circuit High), the injector is faulty. Note that accessing the injectors on the 3.6L V6 requires removing the upper intake manifold.
   Typical fix: Replace the faulty fuel injector. 🎬 See this walkthrough for replacing the fuel injectors For the 3.6L V6, the OEM part is GM #12608632. It is highly recommended to replace the intake manifold gaskets at the same time.
   Est. part cost: $60-$150
3. Poor Connection at Injector or ECM ⚪ Low Probability
   How to confirm: Disconnect and inspect the electrical connector at the fuel injector and at the ECM. Look for corrosion, bent, or pushed-out pins. Ensure the connector clicks securely into place. A noid light can be used at the injector connector to see if the ECM is sending a pulse signal.
   Typical fix: Clean the connector terminals with electrical contact cleaner. If pins are damaged, the connector pigtail may need to be replaced.
   Est. part cost: $15-$40 for a new pigtail connector.

Rare But Worth Checking

• Faulty Engine Control Module (ECM): → Shop Engine Control Module (ECM) This is extremely rare. The ECM's internal driver for the injector circuit can fail, but all other possibilities, especially wiring and the injector itself, must be exhaustively ruled out before condemning the ECM.

Diagnosis Steps

1. Verify the presence of code P0274 with an OBD-II scanner.
2. Check for other related codes, such as P0305 (Cylinder 5 Misfire).
3. Perform a thorough visual and physical inspection of the fuel injector wiring harness as detailed in TSB #PIP4924D. Pay close attention to chafe points against the intake plenum, valve cover bolts, and fuel lines.
4. If damage is found, repair the wiring and clear the codes. Test drive to see if the code returns.
5. If the wiring is intact, inspect the electrical connector at the cylinder 5 fuel injector for damage or corrosion. Use a noid light to check for a pulse signal from the ECM.
6. If the connector is good and a signal is present, test the fuel injector. You can measure its resistance with a multimeter (compare to other injectors) or swap it with another cylinder's injector to see if the fault code follows the injector. On the transverse 3.6L V6, Cylinder 5 is on the firewall side (Bank 1), typically the cylinder closest to the passenger side.
7. If the injector is confirmed to be faulty, replace it. Accessing it requires removing the intake manifold.
🎬 Watch: Full intake removal and injector replacement demonstration
8. If the wiring and injector are both good, the issue may be in the connection at the ECM or, in very rare cases, the ECM itself.

Parts You'll Likely Need

• Fuel Injector Wiring Harness Repair Kit/Pigtail (OEM #ACDelco PT2160 (GM 88861094)) — This is the most common failure point according to GM's own service bulletin. Repairing the specific damaged wire or connector is often all that is needed.
  Trusted brands: ACDelco, Dorman
  OEM price range: $30-$50
  Aftermarket price range: $15-$30
• Fuel Injector (3.6L V6) (OEM #GM 12608632 (replaces 12602223)) — If the wiring harness is confirmed to be in good condition, the injector itself is the next most likely component to have failed internally. This is a direct injection injector.
  Trusted brands: ACDelco (OEM), Bosch
  OEM price range: $60-$120
  Aftermarket price range: $40-$90

Related Codes That Often Appear With This One

• P0305 — P0305 means 'Cylinder 5 Misfire Detected'. Since P0274 indicates a fault that prevents the injector from firing correctly, it will almost always cause a misfire on that same cylinder.
• P0205 — This is a general fault code for the 'Cylinder 5 Injector Circuit/Open'. It can appear alongside P0274 as the ECM diagnoses the electrical problem.

Technical Service Bulletins (TSBs) & Recalls

• PIP4924D: SES Light And Misfire With Injector Codes. This bulletin is the primary diagnostic lead for this code, advising technicians to carefully inspect the fuel injector wiring harness for rub-through or open circuits before replacing parts. It applies to a wide range of GM vehicles with the 3.6L V6 engine.

Platform-Specific Known Issues

• A known issue documented in GM Technical Service Bulletin #PIP4924D points to the fuel injector wiring harness rubbing through its insulation. Specific inspection points are against the intake plenum, valve cover bolts, fuel lines, and the side of the cylinder head under the plenum.
• This issue is not unique to the Vue but is common across many GM vehicles that use the 3.6L LLT V6 engine from this era, such as the GMC Acadia and Chevrolet Traverse.

Mechanic-Grade Diagnostic Values

• Fuel Injector Resistance (3.6L LLT V6) — expected: 11 - 14 Ohms. Failure: A reading of infinity (Open Loop), near-zero Ohms (shorted), or a value significantly outside the expected range indicates a faulty injector. Do not confuse with the later LFX engine's low-impedance injectors (~1.5 Ohms).
• Injector Power Wire Voltage (Key On, Engine Off) — expected: ~12 Volts (Battery Voltage). Failure: No voltage suggests an open in the power supply circuit. Voltage present on both the power and control wire can indicate a short to power.
• Injector Pulse Width (at idle) — expected: 2 - 4 milliseconds (ms). Failure: A value of 0 ms on cylinder 5 while other cylinders show a normal pulse width indicates the ECM is not commanding the injector, or the command is not reaching it.

Scan Tool Commands That Help

• GM Tech 2 / GDS2: Cylinder Power Balance Test — This bidirectional command allows a technician to disable individual fuel injectors one by one while the engine is running. If disabling cylinder 5 causes no change in engine RPM or smoothness, while disabling other cylinders does, it confirms cylinder 5 was not contributing. This helps verify the fault's impact.
• GM Tech 2 / GDS2: Fuel Injector Balance Test — This test is used to check for a clogged or mechanically failed injector when electrical tests are inconclusive. The tool commands each injector to fire for a specific duration and measures the corresponding drop in fuel rail pressure. A significantly different pressure drop for cylinder 5 indicates a flow issue with that injector.

Wiring & Ground Locations

• Cylinder 5 — On the transverse 3.6L V6, Bank 1 (odd-numbered cylinders) is the bank of cylinders closer to the firewall. Cylinder 5 is the cylinder on the far passenger side of that bank.. Correctly identifying the cylinder and its associated wiring is the first step in diagnosis.
• Injector 5 Control Wire — The control wire for the cylinder 5 injector is a Dark Green with White stripe (DK GRN/WHT) wire located at Pin 53 of the ECM connector.. This is the specific wire to test for continuity, shorts to ground, or shorts to power between the ECM and the fuel injector connector.
• G110 — A critical ground for the engine control system, located on the right-rear of the engine, typically bolted to the back of the cylinder head (firewall side, passenger side).. A loose or corroded G110 ground can cause a variety of erratic electrical issues, including injector circuit faults. The ECM and other modules rely on this ground point for a stable reference.

Real Owner Repair Stories

• Composite of multiple forum threads on AcadiaForum.net and TraverseForum.com (2009-2012 GM Lambda platform vehicles (Traverse, Acadia, Enclave, Outlook) with 3.6L LLT V6) — Rough idle, flashing check engine light, codes for injector circuit high (P0262, P0268, P0274, etc.) and corresponding misfire codes (P030x).
  ❌ Tried (didn't work) Replacing the fuel injector for the specific cylinder., Replacing the ignition coil and spark plug for the misfiring cylinder.
  ✅ What actually fixed it In a majority of resolved cases, the fix was finding and repairing a chafed wire in the fuel injector wiring harness. The damage was most often found where the harness was rubbing against a valve cover bolt, the edge of the intake plenum, or a metal fuel line. Repair involved splicing the broken wire, protecting it with heat shrink, and securing the harness away from the contact point with zip ties.

OEM Part Supersession History

• 12602223 → 12608632 — Standard part revision and improvement by the manufacturer.
  Heads up: The parts are interchangeable, but 12608632 is the current recommended replacement for the 3.6L LLT engine.

Model Year Variations Within This Range

• 2009-2010: The Saturn VUE was offered with two different V6 engines. The diagnostic approach for P0274 differs significantly between them. The 3.6L DOHC V6 (RPO code LLT) is a direct-injection engine and is the primary subject of TSB #PIP4924D regarding the chafed wiring harness. The 3.5L V6 (RPO code LZE) is an older pushrod, port-injected engine. While it can still log a P0274, the injector part number, resistance value, and common failure points (less prone to the specific harness chafing issue) are completely different.