P0205 on 2011-2014 Chevrolet Camaro: Injector Circuit Malfunction Causes and Fixes

What's Unique About the 2011-2014 Chevrolet CAMARO

For this generation of Camaro, which uses either a V6 (LLT/LFX) or V8 (LS3/L99) engine, injector circuit codes like P0205 are often straightforward. However, General Motors has issued technical service bulletins for similar models and years that point to wiring harness issues. Specifically, TSB #PIP4924D, which applies to the 2011-2014 Camaro, addresses a collection of injector codes (including P0205) that can be caused by the wiring harness rubbing against engine components, leading to an open or short circuit. This makes a thorough wiring inspection particularly important on this vehicle before replacing parts.

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)
• Engine misfire, which may feel like a vibration or shudder
• Rough or unstable idle
• Poor acceleration and loss of power
• Increased fuel consumption
• Strong smell of unburnt fuel from the exhaust
• Engine hesitation or stumbling
• Difficulty starting the engine

Most Likely Causes

1. Faulty Cylinder 5 Fuel Injector 🔴 High Probability → Shop Fuel Injector Fuel injectors are electro-mechanical parts that can fail internally over time due to heat cycles and mileage. The internal solenoid coil can develop an open or short circuit, which is a common failure mode.
   How to confirm: The most definitive test is to swap the cylinder 5 injector with one from another cylinder (e.g., cylinder 3). Clear the codes and run the engine. If the code changes to P0203, the injector is faulty. You can also test the injector's resistance with a multimeter; it should typically be between 11 and 16 ohms. An open circuit (infinite resistance) or short (near-zero resistance) indicates a bad injector.
   Typical fix: Replace the faulty fuel injector. It is often recommended to replace injectors as a set, especially on higher mileage vehicles, to ensure balanced fuel flow, but replacing just the failed one is also an option.
   Est. part cost: $45-$110
2. Wiring Harness Damage (Open or Short Circuit) 🟡 Medium Probability GM TSB #PIP4924D specifically calls out that the injector wiring harness can rub through (chafe) against the intake plenum, valve cover bolts, or fuel lines, causing a short or open circuit. Engine vibration and heat contribute to this wear over time, making it a known issue on this platform.
   How to confirm: Visually inspect the entire length of the wiring harness leading to the cylinder 5 injector. Look for any signs of rubbing, melting, or exposed wires, paying close attention to contact points with the engine. Use a noid light to test for a pulse signal at the injector connector; if the light doesn't flash while cranking the engine, the problem is in the wiring or the ECM.
   Typical fix: Repair the damaged section of the wire using a splice and heat-shrink connector. If the damage is at the connector, replace the connector pigtail. Secure the harness away from any sharp edges or hot components to prevent recurrence.
   Est. part cost: $10-$30
3. Corroded or Loose Injector Connector ⚪ Low Probability The connector is exposed to heat and vibration, which can cause the connection to become loose or for corrosion to build up on the pins, creating high resistance or an open circuit.
   How to confirm: Disconnect the electrical connector from the #5 fuel injector and inspect the pins on both the injector and the connector for any signs of corrosion (green or white powder) or damage. Wiggle the connector with the engine running to see if it affects the misfire.
   Typical fix: Clean the terminals with electrical contact cleaner. Apply a small amount of dielectric grease to the connector before reconnecting to prevent future corrosion and moisture intrusion. If the connector is damaged or the terminals are loose, it should be replaced.
   Est. part cost: $5-$25

Rare But Worth Checking

• Faulty Engine Control Module (ECM): → Shop Engine Control Module (ECM) This is a rare cause. The internal driver circuit for the injector can fail, but all other possibilities (injector, wiring) should be exhaustively ruled out before condemning the ECM. This is an expensive last resort, as confirmed by at least one owner on a Camaro forum who ultimately needed a new PCM after extensive troubleshooting.

Diagnosis Steps

1. Read the code with an OBD-II scanner and confirm P0205 is present. Note any other codes, like P0305, which is expected.
2. Locate cylinder #5. On V8 models (LS3/L99), it's the third cylinder back on the driver's side. On V6 models (LLT/LFX), it's the middle cylinder on the passenger side.
3. Visually inspect the wiring harness and connector for the cylinder 5 fuel injector. Look for obvious signs of damage, chafing, or corrosion as noted in TSB #PIP4924D. Wiggle the harness while the engine is running (if possible) to see if the idle changes.
4. Disconnect the injector and test its internal resistance with a multimeter. A reading between 11-16 ohms is typical for a good injector. An open circuit (infinite resistance) or short (zero resistance) indicates a bad injector.
5. To confirm the circuit's integrity, plug a 'noid light' into the injector's electrical connector. Crank the engine. A steady flashing light indicates the ECM and wiring are sending the pulse signal correctly, pointing to a bad injector. No light or a steady-on light points to a wiring or ECM issue.
6. If the noid light test fails, check for 12V power on one wire of the connector with the key on. If power is present, the issue is on the ground-pulse wire back to the ECM. If no power is present, check the fuse for the fuel injectors.
7. If you suspect the injector but want to be 100% sure, swap the cylinder 5 injector with another one (e.g., cylinder 3). Clear the codes and run the engine. If the fault code moves to P0203, you have confirmed the injector is the problem. If P0205 returns, the problem is in the wiring or ECM.
8. If all wiring and the injector test good, the final possibility is a faulty injector driver in the ECM. This is rare and should be the last item to check.

Parts You'll Likely Need

• Fuel Injector (V6 Engine - LLT/LFX) (OEM #12638530) — This is the most common failure point for a P0205 code on the V6 Camaro, where the injector's internal coil fails electrically.
  Trusted brands: ACDelco, Bosch, Standard Motor Products
  OEM price range: $70-$110
  Aftermarket price range: $45-$90
• Fuel Injector (V8 Engine - LS3/L99) (OEM #12576341) — This is the most common failure point for a P0205 code on the V8 Camaro, where the injector's internal coil fails electrically.
  Trusted brands: ACDelco, Bosch, Delphi
  OEM price range: $60-$100
  Aftermarket price range: $40-$80
• Fuel Injector Connector Pigtail (OEM #ACDelco PT2183) — If the wiring is damaged right at the connector, or the connector itself is corroded or broken, replacing the pigtail is the standard repair.
  Trusted brands: ACDelco, Dorman
  OEM price range: $20-$40
  Aftermarket price range: $10-$25

Related Codes That Often Appear With This One

• P0305 — P0305 means 'Cylinder 5 Misfire Detected.' Since P0205 indicates a fault that prevents the injector from firing correctly, it directly causes a lack of fuel and a subsequent misfire in that cylinder.
• P0300 — This code means 'Random/Multiple Cylinder Misfire Detected.' Sometimes, a single cylinder misfire can be severe enough to be misinterpreted by the ECM as a multiple-cylinder issue, or a wiring problem may be affecting more than one injector.
• P0200 — This code means 'Injector Circuit/Open'. It's a general code for the injector circuit and may appear alongside the more specific P0205 code if the ECM detects a broader fault.

Technical Service Bulletins (TSBs) & Recalls

• PIP4924D: Addresses SES light and misfires with a range of injector DTCs (P0201-P0208, etc.) and points to potential wiring harness chafing.

Platform-Specific Known Issues

• TSB #PIP4924D: General Motors issued this bulletin for 2010-2014 Camaros (among other vehicles) for a Service Engine Soon light with various injector codes, including P0205. The bulletin advises technicians to carefully inspect the fuel injector wiring harness for rubbing against the intake plenum, valve cover bolts, fuel lines, and the side of the cylinder head. This is a well-documented starting point for diagnosis on these cars.

Mechanic-Grade Diagnostic Values

• Fuel Injector Coil Resistance (High Impedance) — expected: 11.0 to 16.0 Ohms. All injectors should be within 0.5 Ohms of each other.. Failure: A reading of 'OL' (Open Loop/infinite resistance) or near 0.0 Ohms indicates a failed injector. A reading that is 20% different from the others suggests the injector is failing.
• Fuel Injector Coil Resistance (V8 LS3 - PN 12576341) — expected: Approximately 12.5 Ohms.. Failure: Significant deviation from 12.5 Ohms, or a reading of open/shorted.
• Fuel Injector Balance Test (Pressure Drop) — expected: The pressure drop for each injector should be within 1.5 PSI (10 kPa) of the others.. Failure: An injector causing a pressure drop significantly more or less than the others indicates a flow problem (clogged or leaking). For example, a drop of 37 PSI when others drop 20 PSI would indicate a failure.

Scan Tool Commands That Help

• GM GDS2 / Tech 2: Fuel Injector Balance Test / Cylinder Power Balance Test — This is a critical bidirectional test to use after verifying the wiring is intact. The tool commands the ECM to disable injectors one by one to see if the RPM drop is consistent across all cylinders. Alternatively, it can pulse each injector and measure the fuel pressure drop on the rail. An inconsistent drop in RPM or fuel pressure for cylinder 5 points directly to a problem with that injector's performance, helping to distinguish a bad injector from a wiring issue.

Wiring & Ground Locations

• Injector Power Source — All injectors receive key-on 12V power from a common pink wire originating from a fuse block.. If the noid light test fails and there is no 12V power at the connector, the issue is upstream in the shared power supply circuit, not the specific control wire for cylinder 5.
• Injector Ground Pulse Wire (Cyl 5) — A specific wire running from the cylinder 5 injector connector directly to a pin on the Engine Control Module (ECM). An LFX V6 ECM pinout is available on forums for tracing this specific wire.. This is the control wire. A short to ground or an open circuit (break) on this wire is a primary cause of P0205. This is the wire to test for continuity between the injector connector and the ECM connector.
• Engine Block Grounds — There are multiple critical grounds on the engine block. Key locations include grounds on the back of each cylinder head (driver and passenger side) and a ground on the front of the passenger side cylinder head (sometimes labeled G103).. The ECM and its driver circuits rely on a solid engine ground reference. A loose or corroded ground strap can cause intermittent and difficult-to-diagnose electrical issues, including injector circuit faults. These should be inspected, cleaned, and tightened during diagnosis.

Real Owner Repair Stories

• Camaro5 Forums user 'LCPLPunk' (2010 Camaro SS L99 (similar platform and issue)) — Persistent P0205 (open circuit injector 5) code that would not resolve.
  ❌ Tried (didn't work) Owner performed extensive troubleshooting., Replaced the PCM with a pre-flashed unit from eBay, but the P0205 code returned.
  ✅ What actually fixed it The owner took the car to a dealership. The final repair involved replacing the PCM again (dealership sourced), replacing the #5 fuel injector, and replacing the pigtail wiring to the injector. This indicates that multiple components in the circuit had failed, and a comprehensive repair was needed.

OEM Part Supersession History

• 12638530 → 12669384 — Standard part lifecycle update by the manufacturer.
  Heads up: These parts are interchangeable. 12669384 is the current service replacement for 12638530 on V6 models.

Model Year Variations Within This Range

• 2011 vs 2012-2014: The V6 engine was updated for the 2012 model year. The 2011 Camaro used the 3.6L LLT V6, while 2012-2014 models used the updated 3.6L LFX V6. While many parts are similar, there are differences in the intake and cylinder heads. However, the injector part number (12638530 and its successor) appears to be consistent for both V6 engines in this range.