P0102 on 2023-2024 GMC Yukon: MAF Sensor Circuit Low Causes and Fixes

What's Unique About the 2023-2024 Gmc YUKON

For the 2023-2024 GMC Yukon and its platform mates (Chevy Tahoe/Suburban, Cadillac Escalade), this code is frequently not just a simple case of a dirty or failed sensor. General Motors has identified a specific problem where water can enter the MAF sensor's electrical connector, potentially during vehicle assembly, leading to corrosion and a poor signal. This issue is documented in Technical Service Bulletin (TSB 24-NA-158), making an inspection of the connector for moisture a critical first step before replacing any 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
• Rough or uneven idle
• Poor acceleration, hesitation, or sluggish engine performance
• Decreased fuel economy
• Engine stalling, especially after starting or when coming to a stop
• Black smoke from the exhaust
• Engine is hard to start or requires multiple attempts
• Cruise control may be inoperative

Most Likely Causes

1. Water Intrusion in MAF Sensor Connector 🔴 High Probability A known issue documented by GM in TSB #24-NA-158 states that water can get into the MAF connector, possibly during assembly, causing corrosion and signal loss.
   How to confirm: Unplug the MAF sensor and carefully inspect the electrical connector on both the sensor and the wiring harness for any signs of moisture, green or white corrosion, or pin damage. The TSB specifically targets this as the primary cause.
   Typical fix: Per TSB #24-NA-158, the official repair is to replace both the MAF sensor and the engine wiring harness connector using a specified service kit. The repair is covered under the Bumper-to-Bumper warranty and has a unique labor operation code (4088488).
   Est. part cost: $100-$200 for both the sensor and connector kit.
2. Dirty Mass Air Flow (MAF) Sensor 🟡 Medium Probability Over time, dirt, oil, and other debris can accumulate on the sensor's delicate sensing elements, insulating them and causing them to report less airflow than is actually present. This is a common issue for all vehicles, not just the Yukon.
   How to confirm: Visually inspect the MAF sensor's wires or elements. If they appear coated in grime, they need cleaning.
   Typical fix: Remove the sensor and clean it carefully using only a dedicated MAF sensor cleaner spray. Do not touch the elements or use other chemicals like brake cleaner, which can damage the sensor.
   Est. part cost: $10-$15 for a can of MAF cleaner.
3. Faulty Mass Air Flow (MAF) Sensor 🟡 Medium Probability
   How to confirm: If the connector is clean and dry, and cleaning the sensor does not resolve the code, the sensor's internal electronics may have failed. This can be confirmed by testing its voltage output with a multimeter against the vehicle's specifications or by substituting a known-good sensor. 🎬 See this breakdown of MAF circuit low input causes.
   Typical fix: Replace the MAF sensor. It is highly recommended to use an OEM part from a brand like ACDelco to avoid performance issues. The TSB for this vehicle requires sensor replacement along with the connector.
   Est. part cost: $80-$150
4. Clogged Engine Air Filter ⚪ Low Probability
   How to confirm: Inspect the engine air filter. If it is visibly dirty, black, or clogged with debris, it is restricting airflow and can cause the MAF to read lower than expected.
   Typical fix: Replace the engine air filter. This is a simple and inexpensive maintenance item that should be checked first.
   Est. part cost: $20-$50
5. Vacuum Leak ⚪ Low Probability
   How to confirm: Inspect all air intake hoses and connections between the MAF sensor and the engine for cracks, loose clamps, or disconnections. Any air that enters the engine after the MAF sensor is 'unmetered' and can cause a low reading. A smoke test is the most effective way to find hard-to-see leaks.
   Typical fix: Repair the source of the leak, which may involve tightening a clamp or replacing a cracked intake boot.
   Est. part cost: $5-$150 depending on the failed component.

Rare But Worth Checking

• Wiring Harness Short to Ground:

Diagnosis Steps

1. Check for other diagnostic trouble codes (DTCs) stored in the ECM, particularly communication codes like U060F or U1346, which strongly point to the TSB issue.
2. Visually inspect the engine air filter. Replace if it is dirty or clogged.
3. Carefully unplug the MAF sensor electrical connector. Thoroughly inspect both the harness side and the sensor side for any signs of moisture, corrosion (green or white powder), or bent/damaged pins. This is the most likely cause on this vehicle.
4. If the connector is clean and dry, inspect the MAF sensor elements for dirt or contamination. If dirty, clean it with dedicated MAF sensor cleaner and allow it to dry completely.
5. Inspect the air intake ducting between the MAF sensor and the throttle body for any cracks, tears, or loose connections that could cause a vacuum leak.
6. If the connector was corroded or wet, perform the repair outlined in TSB #24-NA-158, which involves replacing both the sensor and the connector pigtail.
7. If all else appears normal, test the MAF sensor's power, ground, and signal wires with a multimeter. With the key on, engine off, you should have a power wire (often 12V), a ground wire (check for continuity to chassis ground), and a 5V reference signal wire. Wiggling the harness while monitoring readings can help identify intermittent wiring issues.
8. If the circuit is good and the sensor is clean but the code persists, the MAF sensor itself has likely failed and should be replaced.

Parts You'll Likely Need

• Engine Wiring Connector Kit (OEM #85519071) — This is the specific part kit required by GM's TSB #24-NA-158 to fix the common water intrusion issue at the MAF sensor connector.
  Trusted brands: ACDelco
  OEM price range: $40-$70
  Aftermarket price range: $25-$50
• Mass Air Flow (MAF) Sensor (OEM #12711681) — This is the replacement sensor specified in TSB #24-NA-158. The sensor itself may be damaged by the water intrusion or may fail on its own. Note: Some parts vendors incorrectly list this as a MAP sensor, but the TSB confirms it is the MAF sensor part number for this repair.
  Trusted brands: ACDelco, Delphi, Hitachi, NGK
  OEM price range: $80-$150
  Aftermarket price range: $50-$100
• MAF Sensor Cleaner — Often, the sensor is just dirty and cleaning it is a cost-effective first step before replacement.
  Trusted brands: CRC, Liqui Moly
  Aftermarket price range: $10-$15

Related Codes That Often Appear With This One

• U060F — This is a communication code that GM's TSB #24-NA-158 explicitly mentions can appear alongside P0102 due to the water intrusion issue at the MAF sensor connector.
• U1346 — Similar to U060F, TSB #24-NA-158 notes this communication code can be set with P0102 when water affects the MAF sensor circuit.
• P0101 — This code indicates 'MAF Sensor Performance/Range'. It can appear with P0102 as it also points to the sensor's readings being illogical, though not necessarily a circuit-low fault.

Technical Service Bulletins (TSBs) & Recalls

• 24-NA-158: Malfunction Indicator Lamp Illuminated with Active DTC P0102 and Possibly U060F and U1346 at the Mass Air Flow Sensor.

Platform-Specific Known Issues

• Technical Service Bulletin #24-NA-158 was issued by GM for a condition where water can infiltrate the MAF sensor connector, causing a low signal (P0102) and sometimes communication codes (U060F, U1346). The cause is noted as potential water intrusion during vehicle assembly.

Mechanic-Grade Diagnostic Values

• MAF Sensor Live Data (Scan Tool) — expected: 2 to 7 grams/second (g/s) at warm idle. Should rise linearly to 15 to 25 g/s at 2500 RPM.. Failure: A reading near zero g/s, or a reading that does not increase with RPM, indicates a problem.
• MAF Sensor Frequency (Scan Tool or Multimeter with Hz function) — expected: Approximately 1200-3000 Hz at warm idle. Should rise above 7000 Hz at wide-open throttle. A snap throttle test should show a peak near 8500 Hz.. Failure: A frequency reading that is stuck, very low, or does not respond smoothly to throttle changes.
• MAF Sensor Power Supply Voltage (Multimeter) — expected: 7.5V to 14V at the power supply pin with key on, engine off.. Failure: Voltage below 7.5V or no voltage indicates a wiring or fuse issue before the sensor.
• MAF Sensor Signal Voltage (Multimeter) — expected: Approximately 0.5V to 1.5V at idle. Should increase smoothly with RPM.. Failure: Voltage near 0V or a fixed voltage that doesn't change with airflow points to a failed sensor or circuit fault.

Wiring & Ground Locations

• G103 / G108 — Located on the back side of the cylinder heads.. These are primary engine grounds. A poor connection at these points can cause erratic voltage and signal issues for multiple sensors, including the MAF sensor, leading to incorrect readings and codes like P0102.
• MAF Sensor Connector — On the air intake tube, between the air filter housing and the throttle body.. This connector has pins for power (typically 12V), ground, and the signal wire (frequency/voltage output). Per TSB #24-NA-158, this specific connector is the most common failure point due to water intrusion, making pin inspection critical.

Real Owner Repair Stories

• GM Technical Service Bulletin #24-NA-158 and common forum discussions (2023-2024 GMC Yukon / Chevy Tahoe) — Check Engine Light with code P0102, sometimes accompanied by communication codes U060F and U1346. Engine may run rough or hesitate.
  ❌ Tried (didn't work) Clearing the code (it returns immediately or soon after), Cleaning the MAF sensor (does not fix the issue if corrosion is present in the connector), Replacing only the MAF sensor (the code often returns because the damaged harness-side connector is the root cause)
  ✅ What actually fixed it Following the procedure in TSB #24-NA-158, which requires replacing both the MAF sensor (PN 12711681) and the engine wiring harness connector pigtail (PN 85519071) due to water intrusion and corrosion.

OEM Part Supersession History

• 19330674, 19352416, 19371196 → 85519071 — Standard part evolution and consolidation.
  Heads up: Part #85519071 is the current wiring harness connector kit specified in TSB #24-NA-158 for the water intrusion repair.
• 12594942, 12644228, 12694725, 12701247 → 12711681 — Standard part evolution and design updates.
  Heads up: Part #12711681 is the correct MAF sensor for the TSB repair. Some parts catalogs incorrectly identify this part number as a MAP or Barometric Pressure sensor; however, GM documentation confirms it is the correct sensor for this application.

Model Year Variations Within This Range

• 2023-2024: These model years are specifically called out in TSB #24-NA-158 for the water intrusion issue at the MAF sensor connector. While earlier years of the same generation (2021-2022) may experience standard MAF sensor failures, they are not covered under this specific bulletin, making the diagnosis of water intrusion the primary difference and first check for 2023-2024 models.