2024 GMC Hummer EV Problems: 3 Issues Every Owner Should Know

2024 GMC Hummer EV Problems: 3 Issues Every Owner Should Know | Au7o

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Community Reported

85 owners

On the 2022-2024 GMC Hummer EV, owners report a cascade of warning messages appearing simultaneously — 'One Pedal Driving Unavailable,' 'Service ESC,' 'Service Trailer Brake System,' and 'Service Active Steering System' — with the vehicle's speed limited to approximately 36 mph. The issue appears related to communication faults between the vehicle's multiple electronic control modules, particularly affecting the electric stability control and four-wheel steering systems. The Hummer EV's CrabWalk and Extract Mode features may also become disabled. The issue can occur without warning and may require a dealer visit to clear.

This issue also affects: Alfa Romeo Giulia, Alfa Romeo Stelvio, Ford Transit

Common Symptoms

Multiple warning messages appear on the dashboard simultaneously
Vehicle speed limited to approximately 36 mph
One Pedal Driving Unavailable message
Service ESC warning light
CrabWalk and four-wheel steering features disabled

How to Fix

Pull over safely and perform a complete vehicle power-down: turn off, open and close the door, wait 3-5 minutes, then restart. If warnings persist, the vehicle needs a dealer visit for module reprogramming. Do not ignore the speed limitation — driving at highway speeds may not be safe if the ESC system is faulted. The dealer will perform a full module scan and reprogram affected control units. Multiple visits may be required as GM releases updated software calibrations.

What Owners Are Using

Parts and tips from 85+ owners who fixed this issue

TipDocument every occurrence with photos of the dashboard warnings and note the date, mileage, and conditions. If the issue recurs frequently, this documentation supports a lemon law claim and helps the dealer isolate the pattern.
UpgradeAutomotive relay replacement set for common relay failures (Bosch Automotive Relay 5-Pin 12V)
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UpgradeDigital multimeter for diagnosing fuse, relay, and module electrical faults (Innova Digital Multimeter)
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Typical repair cost:$0 - $300

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85+ owners have reported this issue

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Community Reported

Medium Confidence85 reportsLast reported by owners Mar 2026Reviewed Mar 2026

Community Reported

120 owners

On the 2022-2024 GMC Hummer EV, some GMC Hummer EV models experience a software anomaly that prevents the vehicle from initiating the charge sequence when plugged into public DC fast chargers. The issue may be caused by oversized or damaged terminals in the charge cord connector at frequently-used stations, but a software bug also prevents the vehicle from gracefully handling connection errors. Additionally, the battery energy control module may fail to exit its commissioning (start-up) state due to the cell monitoring unit going offline, requiring a dealer software reprogram of both the battery energy control module and drive motor control module.

Common Symptoms

Vehicle fails to initiate charging at DC fast chargers
Charging session starts but immediately stops
Service High Voltage System warning appears
Vehicle enters reduced power or limp mode
One Pedal Driving Unavailable warning message

How to Fix

Visit a GMC dealer for the latest battery energy control module and drive motor control module software updates. If charging fails at a public station, try a different charger or use Level 2 AC charging as a workaround. For the commissioning state issue, a dealer reprogram of the BECM and DMCM is required. GM has released multiple software updates addressing these issues — ensure your vehicle has the latest calibration files installed.

What Owners Are Using

Parts and tips from 120+ owners who fixed this issue

TipIf the Hummer EV refuses to charge at a public station, power cycle the vehicle completely (turn off, wait 2 minutes, restart). This clears many temporary software glitches. If it persists, Level 2 home charging usually still works while you wait for the dealer appointment.
TipAsk the dealer to check for ALL pending software updates, not just the one related to your specific complaint. Multiple calibration updates may be available and installing them together prevents repeat visits.
UpgradeHigh-performance AGM battery with excellent cold cranking amps and deep cycle capability (Optima RedTop AGM Battery)
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UpgradeOEM-quality replacement battery with reliable performance (ACDelco Professional AGM Battery)
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UpgradeAutomatic battery maintainer to prevent parasitic drain issues during storage (Battery Tender Junior 12V Battery Charger Maintainer)
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UpgradePremium electrical tape for wiring repairs and harness wrapping (3M Super 33+ Vinyl Electrical Tape)
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UpgradeSplit wire loom tubing to protect repaired or exposed wiring harnesses (DEI Split Wire Loom Tubing)
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UpgradeWeatherproof terminal connector kit for reliable wiring repairs (Molex Automotive Terminal Connector Kit)
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UpgradeAutomotive relay replacement set for common relay failures (Bosch Automotive Relay 5-Pin 12V)
View on Amazon
UpgradeDigital multimeter for diagnosing fuse, relay, and module electrical faults (Innova Digital Multimeter)
View on Amazon
UpgradeLevel 2 portable EV charger for reliable home or on-the-go charging (Lectron Portable Level 2 EV Charger)
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Typical repair cost:$0 - $200

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120+ owners have reported this issue

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Community Reported

High Confidence120 reportsLast reported by owners Mar 2026Reviewed Mar 2026

Community Reported

65 owners

On the 2022-2024 GMC Hummer EV, water can enter the inside of the upper A-pillar on the driver side due to inadequate sealing, leading to corrosion on the in-line connector (X500) for the driver-side door switches. This causes the door lock, power mirror, and window switches to become inoperative. The issue is particularly problematic because the Hummer EV's removable roof panels may contribute to water channeling into the A-pillar area. GM issued a Technical Service Bulletin addressing the connector corrosion.

Common Symptoms

Driver-side power windows stop working
Door lock switch becomes intermittent or inoperative
Power mirror adjustment stops responding
Visible moisture or water stains inside the A-pillar trim
Switches work intermittently, especially after rain or car wash

How to Fix

Have a GMC dealer inspect and reseal the driver-side A-pillar area and replace the corroded X500 in-line connector. The repair involves resealing the A-pillar weatherstripping and replacing the corroded connector terminals ($200-$500 at dealer). If door switches are intermittent, check for moisture in the A-pillar before replacing the switch pack itself. Apply dielectric grease to the connector after repair to prevent future corrosion.

What Owners Are Using

Parts and tips from 65+ owners who fixed this issue

TipIf your door switches work intermittently, remove the A-pillar trim and check for moisture before spending money on a new switch pack. The corroded connector is the root cause, not the switches themselves.
UpgradeDirect-fit window regulator assembly with motor for easy installation (Dorman Power Window Regulator and Motor Assembly)
View on Amazon
UpgradePremium electrical tape for wiring repairs and harness wrapping (3M Super 33+ Vinyl Electrical Tape)
View on Amazon
UpgradeSplit wire loom tubing to protect repaired or exposed wiring harnesses (DEI Split Wire Loom Tubing)
View on Amazon
UpgradeWeatherproof terminal connector kit for reliable wiring repairs (Molex Automotive Terminal Connector Kit)
View on Amazon

Typical repair cost:$200 - $500

Research This Issue

65+ owners have reported this issue

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Community Reported

High Confidence65 reportsLast reported by owners Mar 2026Reviewed Mar 2026

Frequently Asked Questions

What are the most common GMC Hummer EV problems?

According to Au7o's analysis of 270+ owner reports, the 2024-2024 GMC Hummer EV has 3 documented issues. The most frequently reported are: Multiple Warning Lights with Speed Limited to 36 MPH, Public Charging Failures and Software Anomalies, A-Pillar Water Leak Disables Door Switches. Of these, 1 is rated critical and should be addressed promptly.

Is the GMC Hummer EV reliable?

The 2024-2024 GMC Hummer EV has 3 known issues documented across 270+ owner reports. 1 issue is rated critical: Multiple Warning Lights with Speed Limited to 36 MPH. 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 Hummer EV problems?

Repair costs for known GMC Hummer EV issues range from $0 to $500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Multiple Warning Lights with Speed Limited to 36 MPH, typically costs $0-$300 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2022-2024 GMC Hummer EV Multiple Warning Lights with Speed Limited to 36 MPH?

Owners report a cascade of warning messages appearing simultaneously — 'One Pedal Driving Unavailable,' 'Service ESC,' 'Service Trailer Brake System,' and 'Service Active Steering System' — with the vehicle's speed limited to approximately 36 mph. The issue appears related to com… Repairs typically run $0-$300. Severity: high.

What is the 2022-2024 GMC Hummer EV Public Charging Failures and Software Anomalies?

Some GMC Hummer EV models experience a software anomaly that prevents the vehicle from initiating the charge sequence when plugged into public DC fast chargers. The issue may be caused by oversized or damaged terminals in the charge cord connector at frequently-used stations, but… Repairs typically run $0-$200. Severity: medium.

What is the 2022-2024 GMC Hummer EV A-Pillar Water Leak Disables Door Switches?

Water can enter the inside of the upper A-pillar on the driver side due to inadequate sealing, leading to corrosion on the in-line connector (X500) for the driver-side door switches. This causes the door lock, power mirror, and window switches to become inoperative. The issue is… Repairs typically run $200-$500. Severity: medium.

2024 GMC Hummer EV Problems: 3 Issues Every Owner Should Know

All 3 Known Issues

2022-2024 GMC Hummer EV: Multiple Warning Lights with Speed Limited to 36 MPH#

Common Symptoms

How to Fix

What Owners Are Using

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2022-2024 GMC Hummer EV: Public Charging Failures and Software Anomalies#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2022-2024 GMC Hummer EV: A-Pillar Water Leak Disables Door Switches#

Common Symptoms

How to Fix

What Owners Are Using

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Other GMC Models

Frequently Asked Questions

What are the most common GMC Hummer EV problems?

Is the GMC Hummer EV reliable?

How much does it cost to fix common GMC Hummer EV problems?

What is the 2022-2024 GMC Hummer EV Multiple Warning Lights with Speed Limited to 36 MPH?

What is the 2022-2024 GMC Hummer EV Public Charging Failures and Software Anomalies?

What is the 2022-2024 GMC Hummer EV A-Pillar Water Leak Disables Door Switches?