U1510 on 2015-2017 Chevrolet Silverado: Active Grille Shutter Communication Failure Causes and Fixes

What's Unique About the 2015-2017 Chevrolet SILVERADO

While U-codes can be complex, the U1510 on this specific Silverado generation has a very common and well-documented failure point: the active grille shutter assembly. The control module for the shutters is built directly into the assembly, and when it fails internally, it takes down this specific communication line. While a GM Technical Service Bulletin (TSB PIT5405C, later superseded by 21-NA-149) does mention that a poor body ground (G218) can cause a host of communication codes including U1510, real-world owner and mechanic reports for this specific code point overwhelmingly to the shutter assembly itself being the culprit, especially when U1510 is the only code present.

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 illuminated.
• Active grille shutters may be visibly stuck open or closed.
• In some cases, the engine may run cooler than normal if the shutters are stuck open.
• Inability to command the shutters open or closed using a bidirectional scan tool.

Most Likely Causes

1. Failed Active Grille Shutter Assembly 🔴 High Probability The control module is integrated into the shutter assembly, which is exposed to weather, vibration, and potential debris at the front of the vehicle. Obstructions like bird or mouse nests can jam the louvers, burning out the motor.
   How to confirm: After verifying power and ground at the shutter's electrical connector, the absence of a proper LIN bus signal (a varying voltage) points to an internal failure of the module. If power and ground are good, the assembly is almost certainly bad. 🎬 Watch: A step-by-step diagnosis of the shutter assembly failure. A Chevy dealer service advisor on Reddit noted they 'sell several of them a month for this DTC'.
   Typical fix: Replace the entire active grille shutter assembly. It is sold as a single unit including the louvers, motor, and control module. The ambient air temperature sensor may need to be swapped from the old unit to the new one.
   Est. part cost: $150 - $250
2. Wiring Harness or Connector Issue 🟡 Medium Probability The wiring to the front of the vehicle is susceptible to damage from road debris, moisture, and corrosion. The connector itself can also fail.
   How to confirm: Visually inspect the wiring harness leading to the shutter assembly. Unplug the connector and check for corrosion ('green crusties') or backed-out pins. Test for continuity on the power, ground, and LIN bus wires if damage is suspected.
   Typical fix: Repair the damaged section of wire or clean/replace the electrical connector.
   Est. part cost: $5 - $50
3. Poor Body Control Module (BCM) Ground (G218) ⚪ Low Probability TSB #PIT5405C specifically calls out the BCM ground at G218 as a potential source for a wide range of communication codes, including U1510. The issue stems from sound-deadening dash insulation being trapped under the ground eyelet during factory assembly, creating a poor connection.
   How to confirm: Locate the G218 ground point (on the left side of the instrument panel support, behind the trim near the speaker) and inspect it for looseness or corrosion. This is a less likely cause if U1510 is the only code present, but highly likely if accompanied by other electrical issues like a flickering dash or loss of power steering.
   Typical fix: Remove the ground nut and eyelet, cut away the interfering insulation mat, clean the contact surfaces, and securely retighten the ground.
   Est. part cost: $0 - $5

Rare But Worth Checking

• Blown Fuse:

Diagnosis Steps

1. Scan the vehicle for codes. If U1510 is present alone, suspect the shutter assembly. If U1510 is present with many other communication codes (U0073, U0140, etc.) and electrical gremlins, suspect the G218 ground first.
2. Check fuse F47 in the under-hood fuse block.
🎬 Watch: How to find and replace the grille shutter fuse.
3. Visually inspect the active grille shutters for obstructions like leaves, debris, or animal nests, which can cause the motor to fail.
4. Remove the upper radiator cover and front grille to access the shutter assembly's electrical connector, located near the passenger side headlight.
5. Inspect the electrical connector. Check for moisture, corrosion, or damaged pins.
6. With the key on, use a multimeter to test the connector's terminals: Pin 1 (Violet/Blue wire) should have battery voltage. Pin 4 (Black wire) should have a good ground.
7. Probe the LIN bus data wire at Pin 2 (Green/Violet wire). You should see a *varying* voltage that toggles between ~1V and ~11V. A steady 0V, 12V, or a flat-line voltage indicates a communication breakdown.
8. If power and ground are present but the data signal is flat or incorrect, the active grille shutter assembly has failed internally and needs to be replaced.
9. If multiple communication codes are present, locate and inspect the BCM ground at G218 as per TSB #PIT5405C.

Parts You'll Likely Need

• Active Grille Shutter Assembly (OEM #84114139, 23481275) — This is the most common failure. The internal control module fails, causing the communication loss that sets code U1510. Note: The ambient air temperature sensor is often attached and must be transferred to the new part.
  Trusted brands: ACDelco (OEM), Dorman (e.g., 25800-01)
  OEM price range: $200-$275
  Aftermarket price range: $150-$220

Technical Service Bulletins (TSBs) & Recalls

• PIT5405C / 21-NA-149: Mentions that a poor Body Control Module ground at G218 can cause U1510 among many other communication codes and severe electrical symptoms like stalling or loss of power steering.

Platform-Specific Known Issues

• Technical Service Bulletin PIT5405C (and its successor 21-NA-149) notes that a poor ground at location G218 can cause numerous communication DTCs, including U1510. The root cause is often dash insulation foam being improperly installed under the ground eyelet at the factory, creating a high-resistance connection.

Mechanic-Grade Diagnostic Values

• LIN Bus Voltage (Active Communication) — expected: Toggling voltage with a minimum of ~1V and a maximum of ~1V less than battery voltage (approx. 12V).. Failure: A steady or flat-line voltage (e.g., stuck at 0V, 7V, or 12V) indicates a communication failure.
• LIN Bus Voltage (At Rest) — expected: A steady voltage of approximately 12V (or battery voltage).. Failure: Voltage significantly lower than battery voltage when the bus should be at rest.
• LIN Bus Voltage Measurement Technique — expected: Use a multimeter with a 'peak min/max' or '1ms record' setting to capture the true voltage range.. Failure: Using a standard voltmeter setting may show an averaged reading (e.g., 7-9V) which can be misleading and not show the true communication toggling.

Hidden / Shadow Codes Worth Checking

• P059F / U0284: These codes for shutter performance issues may be set in conjunction with other communication codes. If U1510 is present with these, TSB 21-NA-077 provides a specific diagnostic path focusing on wiring, splices, and connectors. (see via Standard OBD-II scanner.)

Scan Tool Commands That Help

• GDS2 or equivalent bidirectional scanner: Active Grille Shutter Command (Open/Close) — Use this command, typically found in the ECM's 'Output Control' or 'Function Test' menu, to verify if the shutter motor responds. If the command is sent but the shutter does not move, and wiring tests good, it confirms a failed shutter assembly.

Wiring & Ground Locations

• G218 — Under the driver's side dash, on the left side of the instrument panel support structure, often above the hood release lever.. 🎬 See how to locate and repair the G218 ground point. This is the main ground for the Body Control Module (BCM). A poor connection here due to trapped insulation is a known cause for U1510 and a host of other communication codes, as documented in TSB PIT5405C.
• X317 — Behind the front grille, on the passenger side of the active shutter assembly. It is typically a grey connector with a red locking tab.. This is the main electrical connector for the active grille shutter assembly. Testing for power, ground, and the LIN data signal happens at this connector.
• X132 — The jumper harness connector between the main engine harness and the active grille shutter actuator harness.. TSB 21-NA-077 specifically advises inspecting this connector for broken wiring or water intrusion as a potential cause for shutter communication issues.
• J171 — A splice in the engine wiring harness related to the shutter circuit.. TSB 21-NA-077 notes that moving this splice, even slightly, can cause intermittent communication. If found to be faulty, the TSB recommends cutting out and replacing the entire splice, not repairing it.

Real Owner Repair Stories

• YouTube channel 'South Main Auto Repair' (2017 Chevrolet Silverado Z71 5.3L) — Check engine light with code U1510, 'loss of communication with a device on the LIN bus.'
  ❌ Tried (didn't work) Diagnosis confirmed it was not a broader network issue.
  ✅ What actually fixed it Replaced the entire active grille shutter assembly. The technician noted that on this truck, the shutter is the only device on the ECM's LIN bus, making diagnosis straightforward. After replacement and clearing the code, the code did not return.
• YouTube channel 'PurpleSonoma' (2018 Chevrolet Silverado) — Check engine light with code U1510.
  ❌ Tried (didn't work) The user initially tried clearing the code, but it returned.
  ✅ What actually fixed it Replaced the active shutter assembly. The video provides a detailed walkthrough of the grille removal and shutter replacement, including swapping the ambient air temperature sensor. After replacement and clearing the code, the user confirmed days later that the check engine light remained off.
• YouTube channel 'Active Grille Shutters: U1510 Code Easy Fix Guide!' (Chevrolet Silverado (year not specified, but K2XX body style)) — Check engine light with code U1510. The user also noted an ambient air temperature sensor code.
  ❌ Tried (didn't work) The user first cleaned out a large bird/mouse nest from the shutter assembly, but the unit was already non-functional.
  ✅ What actually fixed it Checked fuse F47 (it was good), then replaced the entire active grille shutter assembly. The user suspected the nest caused the motor to jam and burn out. After replacement and clearing codes, the check engine light went out and stayed out.

OEM Part Supersession History

• 23481275, 84114139 → Multiple part numbers exist (e.g., 84113869). — Standard part evolution and supplier changes.
  Heads up: It is critical to verify the correct part number using the vehicle's VIN. Some replacement assemblies may come with a new ambient air temperature sensor, while others require transferring the sensor from the old unit.

Model Year Variations Within This Range

• 2014-2016 vs 2017-2019: The under-hood fuse box layout changed. While F47 is commonly cited, one source suggests F54 may be the correct fuse for 2014-2016 models. Always verify with the fuse box diagram.
• 2015-2017 vs later models: On this generation, the ECM sets a generic 'U1510 - Lost Communication with Device on LIN Bus' code. On later model years, GM updated the software to set a more descriptive code that specifically names the Active Grille Shutter as the faulting component.