What is the 2014-2023 GMC Sierra 1500 AFM/DFM Lifter Collapse and Failure?

The Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) systems use special hydraulic lifters that collapse to deactivate cylinders for fuel economy. These lifters are prone to premature failure due to poor physical design and inadequate oil flow. Failures can occur as… Repairs typically run $4,000-$8,000. Severity: high.

What is the 2015-2023 GMC Sierra 1500 8-Speed/10-Speed Transmission Torque Converter Shudder?

The 8L90 8-speed and 10L80/10L90 10-speed automatic transmissions experience shuddering during light throttle acceleration, particularly at highway speeds between 35-60 mph. The issue is caused by the torque converter lock-up clutch slipping and chattering. Harsh shifts between g… Repairs typically run $150-$4,500. Severity: high.

What is the 2014-2023 GMC Sierra 1500 Electronic Brake Control Module Failure?

The electronic brake control module (EBCM) experiences failures causing ABS, traction control, and stability control systems to malfunction. Issues range from warning lights illuminating to complete system failures. The 2023 models have a specific recall for software that may fai… Repairs typically run $150-$1,500. Severity: high.

What is the 2014-2015 GMC Sierra 1500 Transfer Case Unintended Shift to Neutral?

An electrical signal short in the transfer case can cause it to shift to neutral without driver input while driving. This results in sudden loss of power to the wheels creating a serious safety hazard, particularly at highway speeds or when towing. Repairs typically run $0-$0. Severity: high.

What is the 1999-2007 GMC Sierra 1500 Rusting Brake Lines Leading to Fluid Loss and Sudden Brake Failure?

Corrosion of steel brake lines is a major safety issue on older Sierra 1500 trucks, especially in salt-belt states. Owners report the brake pedal suddenly dropping to the floor when a rusted line bursts during normal braking, often near the ABS module or along the frame rails. Th… Repairs typically run $800-$2,500. Severity: high.

What is the 2000-2007 GMC Sierra 1500 Fuel Pump Module Failure Causing No-Start or Stalling?

A common GMT800 Sierra problem is failure of the in-tank fuel pump module, often from worn pump motors or failed level-sender/module electronics. Owners report long crank, hard starting, loss of power under load, or sudden stall/no-start conditions, especially as mileage climbs. Repairs typically run $500-$1,200. Severity: high.

What is the 2000-2007 GMC Sierra 1500 4L60-E / 4L65-E Sun Shell Failure Causing Loss of Reverse and 2nd/4th Gear?

On GMT800 Sierra 1500 trucks equipped with the 4L60-E family automatic, a well-known internal failure is cracking or stripping of the reaction sun shell. Owners commonly report sudden loss of reverse, no 2nd gear, no 4th gear, or a truck that starts in 3rd gear after a bang or fl… Repairs typically run $1,800-$3,500. Severity: high.

What is the 2007-2021 GMC Sierra 1500 P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain on 5.3L AFM V8?

P0016 means the crankshaft and Bank 1 intake camshaft are out of sync beyond tolerance. On the 5.3L V8 Sierra 1500 this is a signature failure because of two engine-specific problems: (1) the timing chain stretches over time — accelerated by AFM lifter debris and extended oil-cha… Repairs typically run $150-$1,800. Severity: high.

What is the 2007-2018 GMC Sierra 1500 P0700 — Transmission Fault Flag from Failing 6L80/6L90 Internal TEHCM?

P0700 itself is only a flag: the Transmission Control Module has stored one or more transmission faults and is requesting the MIL. On Sierra 1500s with the 6L80 (and 6L90 on heavier variants) 6-speed automatic, the notable design issue is that the TCM is integrated into the valve… Repairs typically run $600-$2,500. Severity: high.

What is the 2014-2018 GMC Sierra 1500 Intermediate Steering Shaft Clunk?

The upper intermediate steering shaft develops excessive wear causing a pronounced clunking noise when turning the steering wheel or going over bumps. The issue is caused by wear in the shaft's universal joints or the plastic bushing near the firewall. GM has redesigned the part… Repairs typically run $50-$600. Severity: medium.

What is the 2014-2020 GMC Sierra 1500 A/C Compressor and Clutch Failure?

The A/C compressor is prone to premature failure due to faulty welds, insufficient lubrication, or internal mechanical failure. When the compressor fails catastrophically, metal debris contaminates the entire A/C system requiring replacement of multiple components. The A/C clutch… Repairs typically run $500-$2,500. Severity: medium.

What is the 2019-2023 GMC Sierra 1500 Infotainment System Audio Loss and Malfunction?

The infotainment system experiences intermittent complete audio loss affecting stereo, turn signals, and safety warning sounds. The audio system may randomly go to maximum volume and cannot be controlled. OTA software updates have caused additional issues including erratic blinke… Repairs typically run $0-$2,500. Severity: medium.

What is the 2014-2023 GMC Sierra 1500 Direct Injection Carbon Buildup on Intake Valves?

Direct injection engines do not spray fuel over the intake valves like port injection systems, allowing carbon deposits from oil and blow-by gases via the PCV system to accumulate on intake valve backs and ports. Over time, this buildup restricts airflow causing performance and e… Repairs typically run $400-$800. Severity: medium.

What is the 2003-2007 GMC Sierra 1500 Stepper Motor Instrument Cluster Failure Causing Inaccurate Gauges?

2003-2007 Classic-era Sierra trucks are well known for instrument cluster gauge failures caused by defective stepper motors and, in some cases, backlighting issues. Speedometer, tachometer, oil pressure, fuel, voltage, and coolant gauges can stick, read wildly high or low, or sto… Repairs typically run $250-$700. Severity: medium.

What is the 1999-2013 GMC Sierra 1500 Front Hub Bearing Assembly Failure Causing ABS Activation, Noise, and Wheel Play?

Front wheel hub bearing assemblies on Sierra 1500 trucks commonly wear out, especially on 4WD models and trucks used with larger tires or in rough conditions. Owners report humming or growling that changes with speed, looseness in the front wheel, and in some cases ABS warnings o… Repairs typically run $300-$900. Severity: medium.

What is the 2003-2007 GMC Sierra 1500 Fuel Level Sensor Failure Causing Erratic or Inoperative Gas Gauge?

A very common GMT800 complaint is sulfur contamination and wear of the fuel level sensor contacts inside the tank module, causing the gauge to read empty, full, or fluctuate unpredictably. Owners often see a low-fuel warning with plenty of fuel in the tank or watch the gauge drop… Repairs typically run $450-$1,100. Severity: medium.

What is the 2000-2006 GMC Sierra 1500 Knock Sensor Water Intrusion Under Intake Causing Check Engine Light and Reduced Performance?

The 4.8L, 5.3L, and 6.0L Vortec engines used in early GMT800 Sierra trucks place the knock sensors in wells beneath the intake manifold, where water can collect and corrode the sensors or harness. Owners frequently report recurring check-engine lights, timing retard, and reduced… Repairs typically run $400-$900. Severity: medium.

What is the 2000-2013 GMC Sierra 1500 Blend Door / HVAC Actuator Failure Causing Clicking Behind Dash and Incorrect Air Temperature or Mode?

Sierra owners across both GMT800 and GMT900 generations frequently report small electric HVAC actuators stripping internal gears or losing calibration. The result is a repetitive clicking or tapping noise from the dash, air stuck on defrost or floor, or one side blowing hot while… Repairs typically run $150-$700. Severity: medium.

What is the 2007-2013 GMC Sierra 1500 Power Door Lock Actuator Failure Causing Intermittent or Inoperative Locking?

GMT900 Sierra trucks are well known for failing door lock actuators, often starting with one door that unlocks weakly or only works intermittently before additional doors fail. Owners report the key fob cycling the locks while one or more doors remain stuck, requiring manual oper… Repairs typically run $180-$500. Severity: medium.

What is the 2007-2018 GMC Sierra 1500 P0430 — Catalyst Efficiency Bank 2 (Driver-Side) Converter Failure on 5.3L V8?

P0430 is the Bank 2 counterpart to P0420 and, on the Sierra 1500 V8, points to the driver-side (Bank 2) catalytic converter falling below efficiency threshold. The mechanism is identical to Bank 1: the rear O2 sensor voltage begins mirroring the front sensor, so the ECM concludes… Repairs typically run $400-$1,500. Severity: medium.

GMC · Known Issues

1999-2023 GMC Sierra 1500 Problems: 26 Issues Every Owner Should Know

1999-2023 model years · 4,765+ owner reports · Updated July 2026

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According to Au7o's analysis of 4,765+ owner reports, the 1999-2023 GMC Sierra 1500 has 26 documented known issues, with 9 rated critical. The most serious are AFM/DFM Lifter Collapse and Failure ($4,000-$8,000 repair), 8-Speed/10-Speed Transmission Torque Converter Shudder ($150-$4,500 repair), Electronic Brake Control Module Failure ($150-$1,500 repair), Transfer Case Unintended Shift to Neutral ($0-$0 repair), Rusting Brake Lines Leading to Fluid Loss and Sudden Brake Failure ($800-$2,500 repair), Fuel Pump Module Failure Causing No-Start or Stalling ($500-$1,200 repair), 4L60-E / 4L65-E Sun Shell Failure Causing Loss of Reverse and 2nd/4th Gear ($1,800-$3,500 repair), P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain on 5.3L AFM V8 ($150-$1,800 repair) and P0700 — Transmission Fault Flag from Failing 6L80/6L90 Internal TEHCM. Across all issues, repair costs range from $20 to $8,000. at .

Frequently Asked Questions

What are the most common GMC Sierra 1500 problems?

According to Au7o's analysis of 4,765+ owner reports, the 1999-2023 GMC Sierra 1500 has 26 documented issues. The most frequently reported are: AFM/DFM Lifter Collapse and Failure, 8-Speed/10-Speed Transmission Torque Converter Shudder, Electronic Brake Control Module Failure. Of these, 9 are rated critical and should be addressed promptly.

Is the GMC Sierra 1500 reliable?

The 1999-2023 GMC Sierra 1500 has 26 known issues documented across 4,765+ owner reports. 9 issues are rated critical: AFM/DFM Lifter Collapse and Failure and 8-Speed/10-Speed Transmission Torque Converter Shudder and Electronic Brake Control Module Failure and Transfer Case Unintended Shift to Neutral and Rusting Brake Lines Leading to Fluid Loss and Sudden Brake Failure and Fuel Pump Module Failure Causing No-Start or Stalling and 4L60-E / 4L65-E Sun Shell Failure Causing Loss of Reverse and 2nd/4th Gear and P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain on 5.3L AFM V8 and P0700 — Transmission Fault Flag from Failing 6L80/6L90 Internal TEHCM. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common GMC Sierra 1500 problems?

Repair costs for known GMC Sierra 1500 issues range from $0 to $8,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, AFM/DFM Lifter Collapse and Failure, typically costs $4,000-$8,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year GMC Sierra 1500 is the most reliable?

Reliability varies across model years of the GMC Sierra 1500. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 1999-2023 GMC Sierra 1500 with 26 documented issues documented across 4,765+ owner reports.

All 26 Known Issues

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Frequently Asked Questions

What are the most common GMC Sierra 1500 problems?

Is the GMC Sierra 1500 reliable?

How much does it cost to fix common GMC Sierra 1500 problems?

What year GMC Sierra 1500 is the most reliable?

When Issues Typically Appear

2015-2023 GMC Sierra 1500: 8-Speed/10-Speed Transmission Torque Converter Shudder#

2014-2015 GMC Sierra 1500: Transfer Case Unintended Shift to Neutral#

2000-2007 GMC Sierra 1500: 4L60-E / 4L65-E Sun Shell Failure Causing Loss of Reverse and 2nd/4th Gear#

2007-2018 GMC Sierra 1500: P0700 — Transmission Fault Flag from Failing 6L80/6L90 Internal TEHCM#

2014-2023 GMC Sierra 1500: AFM/DFM Lifter Collapse and Failure#

2007-2021 GMC Sierra 1500: P0016 — Crank/Cam Correlation Fault from Stretched Timing Chain on 5.3L AFM V8#

2014-2023 GMC Sierra 1500: Direct Injection Carbon Buildup on Intake Valves#

2000-2006 GMC Sierra 1500: Knock Sensor Water Intrusion Under Intake Causing Check Engine Light and Reduced Performance#

2007-2022 GMC Sierra 1500: P0011 — Intake Cam Over-Advanced from Sludge-Clogged VVT Solenoid on 5.3L V8#

2014-2023 GMC Sierra 1500: Electronic Brake Control Module Failure#

1999-2007 GMC Sierra 1500: Rusting Brake Lines Leading to Fluid Loss and Sudden Brake Failure#

2000-2007 GMC Sierra 1500: Fuel Pump Module Failure Causing No-Start or Stalling#

2003-2007 GMC Sierra 1500: Fuel Level Sensor Failure Causing Erratic or Inoperative Gas Gauge#

2007-2018 GMC Sierra 1500: P0430 — Catalyst Efficiency Bank 2 (Driver-Side) Converter Failure on 5.3L V8#

2007-2017 GMC Sierra 1500: P0420 — Catalyst Efficiency Bank 1 from Failing Cat, Often Caused by AFM Oil Consumption or Air-Box Debris#

2007-2023 GMC Sierra 1500: P0455 — Gross EVAP Leak from Failed Vent Solenoid, Missing Gas Cap, or Broken Vent Hose#

2007-2018 GMC Sierra 1500: P0442 — Small EVAP Leak from Loose/Cracked Gas Cap or Fractured Filler Vent Hose#

2019-2023 GMC Sierra 1500: Infotainment System Audio Loss and Malfunction#

2003-2007 GMC Sierra 1500: Stepper Motor Instrument Cluster Failure Causing Inaccurate Gauges#

2007-2013 GMC Sierra 1500: Power Door Lock Actuator Failure Causing Intermittent or Inoperative Locking#

2014-2018 GMC Sierra 1500: Intermediate Steering Shaft Clunk#

1999-2013 GMC Sierra 1500: Front Hub Bearing Assembly Failure Causing ABS Activation, Noise, and Wheel Play#

2014-2020 GMC Sierra 1500: A/C Compressor and Clutch Failure#

2007-2019 GMC Sierra 1500: P0128 — Engine Never Reaches Operating Temp from a Stuck-Open Thermostat#

2000-2013 GMC Sierra 1500: Blend Door / HVAC Actuator Failure Causing Clicking Behind Dash and Incorrect Air Temperature or Mode#

2007-2013 GMC Sierra 1500: Upper Dash Pad Cracking and Interior Panel Failure in Sun-Exposed GMT800/GMT900 Trucks#