P0275 on 2016-2019 GMC Sierra 1500: Cylinder 5 Balance Fault Causes & Fixes

What's Unique About the 2016-2019 Gmc SIERRA 1500

For the 2016-2019 GMC Sierra with the 5.3L or 6.2L V8, this code requires careful diagnosis. While a bad fuel injector is a common culprit on any vehicle, these GM engines are known for issues with their Active Fuel Management (AFM) system. A failing AFM lifter can become stuck or collapse, leading to a loss of compression and power in a cylinder, mimicking a fuel problem and setting a contribution code like P0275. TSB #PIP-5400 specifically links these codes to a lack of lubrication in the valvetrain, pointing directly to these known mechanical vulnerabilities. Ignoring this possibility and simply replacing the injector can be a costly misdiagnosis if the root cause is mechanical.

Diagnostic Flowchart

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

Generation note: This year range covers the end of the K2XX generation (2014-2019 Limited) and the start of the T1XX generation (2019-present). Both generations used V8 engines with Active (AFM) or Dynamic Fuel Management (DFM) systems, and the underlying causes, particularly lifter issues, are relevant to both. The problem is widely discussed in owner communities for both generations.

Symptoms You May Notice

• Rough or vibrating idle.
• Hesitation or loss of power during acceleration.
• Reduced fuel economy.
• Illuminated Check Engine Light.
• A distinct ticking or clacking noise from the engine, which is a strong indicator of a mechanical lifter problem.
🎬 Watch: How to diagnose lifter tick vs other engine noises.
• Engine misfire sensations.

Most Likely Causes

1. Faulty Fuel Injector (Cylinder 5) 🔴 High Probability → Shop Fuel Injector
   How to confirm: Listen for the injector's clicking sound with a mechanic's stethoscope or long screwdriver. The most definitive test is to swap the cylinder 5 injector with another cylinder (e.g., cylinder 1) and see if the trouble code follows (e.g., changes to P0263 for cylinder 1). A professional can use an Active Fuel Injector Tester (AFIT) to perform a balance test; a variance of 10% or more from the average indicates a bad injector.
   Typical fix: Replace the faulty fuel injector. The OEM part is ACDelco 12669384. 🎬 See this walkthrough for replacing the fuel injectors.
   Est. part cost: $50-$180
2. AFM/DFM Lifter Failure 🟡 Medium Probability The Active Fuel Management (AFM) systems on these V8 engines are a widely documented failure point. Lifters can become stuck, collapse, or have their roller bearings fail, which prevents proper valve operation and leads to a loss of cylinder power. TSB #PIP-5400 directly connects contribution codes like P0275 to valvetrain lubrication problems, a common precursor to lifter failure.
   How to confirm: Perform a compression test and cylinder leak-down test on cylinder 5. Low compression is a strong indicator. A distinct ticking noise is also a common symptom. Final confirmation requires removing the valve cover and cylinder head to physically inspect the lifters, pushrods, and camshaft lobe for scoring or damage.
   Typical fix: Requires replacing all AFM lifters (it is highly recommended to replace all 16 lifters, not just the failed one), the lifter guides, and often the camshaft if the failed lifter's roller has damaged a lobe. Many owners opt to perform an 'AFM delete' at this time, replacing the problematic components with standard lifters and a non-AFM camshaft, which requires an ECM tune to disable the system.
   Est. part cost: $500-$2000+
3. Fuel Injector Circuit Fault ⚪ Low Probability → Shop Fuel Injector
   How to confirm: Use a noid light to verify the electrical pulse at the cylinder 5 injector connector. Use a multimeter to check for proper voltage and for shorts or opens in the wiring harness between the injector and the ECM. The power feed wire to the injectors is typically pink.
   Typical fix: Repair the damaged wiring or connector.
   Est. part cost: $10-$100

Rare But Worth Checking

• Engine Control Module (ECM) Anomaly: TSB #17-NA-171 mentions that an anomaly in the ECM can cause this code among many others. The fix is to reprogram the ECM with the latest software calibration. This should only be considered after all other mechanical and electrical possibilities have been thoroughly ruled out.

Diagnosis Steps

1. Read the trouble codes with an OBD-II scanner and note any other codes present, especially P0305 or P0300.
2. Listen for a distinct ticking or clacking sound from the engine bay, which would point towards a valvetrain/lifter issue.
3. Inspect the wiring and connector for the cylinder 5 fuel injector for any visible damage, corrosion, or loose pins.
4. Perform a fuel injector swap. Move the injector from cylinder 5 to another cylinder (e.g., cylinder 1). Clear codes and drive the vehicle. If the code changes to P0263 (Cylinder 1 Contribution/Balance), the injector is faulty.
5. If the code remains on cylinder 5 after the swap, the issue is not the injector. Proceed to mechanical checks.
6. Perform a compression test on cylinder 5. Compare the reading to the other cylinders. A significant drop in pressure (more than 15-20% lower than the others) points to a mechanical problem.
7. If compression is low, perform a cylinder leak-down test to pinpoint the source of the leak (intake/exhaust valves, piston rings, or head gasket). A leak from the valves is consistent with a collapsed lifter.
8. If a mechanical fault is suspected, remove the valve cover to inspect the valvetrain (rocker arms, pushrods, valve springs) for cylinder 5. A bent pushrod is a common finding. 🎬 Watch: How to remove lifters and tear down the valvetrain. Further disassembly is required to inspect the lifters and camshaft for scoring and damage.
9. If all mechanical and fuel-related tests pass, investigate the injector circuit with a noid light and multimeter.
10. As a final step, consult a dealer about TSB #17-NA-171 to see if an ECM re-flash is applicable.

Parts You'll Likely Need

• Fuel Injector (OEM #ACDelco 12669384) — This is the most common cause of a single-cylinder contribution fault when a mechanical issue is not present.
  Trusted brands: ACDelco (GM OE), Bosch
  OEM price range: $100-$180
  Aftermarket price range: $50-$120
• AFM Valve Lifter Kit (OEM #12699965 (Kit often includes 8 AFM lifters, 8 standard lifters, and 4 guides)) — A known weak point on this engine platform that directly causes cylinder contribution faults when they fail. It is best practice to replace all 16 lifters during the repair.
  Trusted brands: ACDelco, Delphi, Michigan Motorsports
  OEM price range: $400-$700
  Aftermarket price range: $250-$500
• Camshaft (OEM #Varies by engine (e.g., 12689035 for some 5.3L non-AFM conversions)) — If a lifter roller fails, it often scores and damages the corresponding lobe on the camshaft, requiring replacement of both components for a lasting repair.
  Trusted brands: ACDelco, Texas Speed & Performance
  OEM price range: $300-$600
  Aftermarket price range: $200-$400

Related Codes That Often Appear With This One

• P0305 — This is the code for 'Cylinder 5 Misfire Detected'. A cylinder that isn't contributing power is also misfiring, so this code is very commonly seen with P0275.
• P0300 — This indicates a 'Random/Multiple Cylinder Misfire'. It may appear if the underlying issue, like a failing AFM system, is beginning to affect other cylinders or if the imbalance is severe enough to disrupt overall engine timing.
• P050D — 'Cold Start Rough Idle'. This can accompany P0275 if the issue is more pronounced before the engine reaches operating temperature, which can be the case with both failing injectors and mechanical issues.
• P0263, P0266, P0269, etc. — These are the contribution/balance codes for other cylinders. Seeing multiple codes like this could point to a systemic issue like fuel delivery problems or a widespread mechanical failure (e.g., multiple failing lifters).

Technical Service Bulletins (TSBs) & Recalls

• PIP5468F: Mentions P0275 as part of a group of diagnostic codes, advising technicians to follow standard diagnostics.
• 17-NA-171: Notes that P0275 can be caused by an anomaly in the Engine Control Module (ECM) and that the fix is to reprogram the module with the latest software.
• PIP-5400: Links P0275 and other contribution codes to a lack of lubrication in the valvetrain, a potential cause of lifter and camshaft failure.

Platform-Specific Known Issues

• Active Fuel Management (AFM) Lifter Failure: The V8 engines in this generation of Sierra are notorious for failures of the specialized lifters used by the AFM system. These lifters can collapse or get stuck, preventing the valves from opening properly, which leads to a loss of compression and power, triggering codes like P0275. This is often accompanied by a ticking noise and can damage the camshaft, requiring extensive repairs.
• Valvetrain Lubrication: TSB #PIP-5400 explicitly mentions that a lack of lubrication to rocker arms and valvetrain components can cause a series of contribution codes, including P0275. This reinforces the mechanical vulnerability of the valvetrain, which can lead to lifter failure.

Mechanic-Grade Diagnostic Values

• Low-Pressure Fuel System (Flex Fuel) — expected: 48-54 psi with Key On, Engine Off (KOEO).. Failure: Pressure below 46 psi suggests a weak fuel pump or system blockage.
• Low-Pressure Fuel System Feed to High-Pressure Pump (Direct Injection) — expected: System requires a flow rate of 45 gph at a steady 72 psi (500 kPa).. Failure: Inability to maintain 72 psi indicates a problem with the low-pressure pump or its pulse-width modulated control.
• Fuel Injector Balance Test (using AFIT tool) — expected: All injectors should have a similar pressure drop.. Failure: A variance of 10% or greater from the average pressure drop across all cylinders indicates a faulty injector.

Scan Tool Commands That Help

• GDS2 / Professional Scan Tool: Cylinder Power Balance Test — This is a primary diagnostic step when P0275 is present. The tool deactivates each cylinder one by one while monitoring RPM. If deactivating cylinder 5 causes little or no drop in RPM compared to other cylinders, it confirms cylinder 5 is not contributing power.
• GM AFIT (CH-47976) with SIDI Adapter (CH-47976-500): Fuel Injector Balance Test — This is the GM-specific procedure to definitively test fuel injector flow. It measures the pressure drop created by each injector to identify one that is clogged, restricted, or failing electrically under load.

Wiring & Ground Locations

• G110 / G114 — Engine and body harness grounds in the engine bay.. GM issued Engineering Information (PIE0548) for the 2019+ models regarding loose connections at these specific grounds, which can cause a wide range of electrical faults and drivability issues.
• G218 — Located under the driver's side dash, behind the kick panel on K2XX models (2016-2018).. This is a major interior body ground. While less likely to cause a single injector code, poor grounding here can lead to various intermittent electrical problems for the modules that control the engine.
• Cylinder 5 Injector Connector — Cylinder 5 is the third cylinder back on the driver's side (Bank 1). The injector is located on the fuel rail for that bank.. This is the primary connection point to test. The power feed wire is typically pink on GM V8s, and the other wire is the ground-side control wire pulsed by the ECM.

Real Owner Repair Stories

• Reddit user SmellsLikeShame in r/ChevyTrucks (2019 Silverado 1500 5.3L V8 with 78,000 miles) — Check Engine Light with P0305 (Cylinder 5 Misfire), Service ESC/ABS messages, sluggish engine, and rough transmission shifting.
  ❌ Tried (didn't work) Oil change, Lucas Oil fuel additive
  ✅ What actually fixed it Dealer service found a compression issue due to failed lifters. The final repair was the replacement of all 16 lifters and the camshaft, which was covered under the powertrain warranty.

OEM Part Supersession History

• HL-7011 (Elgin Aftermarket for AFM) → HL-7025 (Elgin Aftermarket for DFM, GM equivalent 12698946) — The newer DFM lifter design was made backward compatible.
  Heads up: The newer DFM lifter (HL-7025 / 12698946) IS backward compatible and can be used in older AFM engines. However, the older AFM-only lifter (HL-7011) CANNOT be used in the newer DFM engines (2019+).

Model Year Variations Within This Range

• 2016-2018: These model years primarily use the L83 (5.3L) and L86 (6.2L) engines equipped with Active Fuel Management (AFM), which deactivates 4 of 8 cylinders.
• 2019: The new T1XX platform introduced in 2019 uses the L84 (5.3L) and L87 (6.2L) engines with Dynamic Fuel Management (DFM). DFM is a more complex system that can run on various cylinder combinations (17 firing patterns) and is active a higher percentage of the time, potentially increasing the risk of lifter failure. Additionally, 2019 models are specifically mentioned in a GM document regarding potential loose grounds at G110 and G114.