2016-2019 Chevrolet Volt BECM Failure: A Guide to Symptoms, Warranty, and Replacement
This in-depth guide covers the widespread Battery Energy Control Module (BECM) issue, from common symptoms and diagnostic codes to replacement costs and critical programming requirements.
- This is a very common failure for 2016-2019 Volts, prompting an NHTSA investigation and a GM Special Coverage Program (N232432680) for some 2016-2018 models.
- Replacement is a major job that requires dropping the entire high-voltage battery pack and is not feasible for most DIY mechanics.
- The module MUST be programmed to the vehicle by a dealer or specialized shop with GM software after installation.
- Symptoms are severe, including a no-start condition or sudden, complete loss of power while driving, making the vehicle unreliable and unsafe to operate.
A Widespread and Well-Documented Issue
The Battery Energy Control Module (BECM) in the 2016-2019 Chevrolet Volt is a known high-failure component. The problem became so prevalent that it prompted an investigation by the National Highway Traffic Safety Administration (NHTSA) in late 2023, covering approximately 73,000 vehicles. The investigation, filed under PE23022, was initiated after the agency received over 60 complaints from owners who experienced sudden power loss, a no-start condition, or the inability to restart their vehicle.
In response to these failures, General Motors issued Technical Service Bulletin (TSB) 18-NA-261. This bulletin acknowledges an "internal issue within the Battery Engine Control Module" and instructs technicians on the diagnostic and replacement procedure. The suspected cause is often attributed to faulty internal solder connections.
Special Coverage Program N232432680: GM later launched a special warranty extension for the BECM on 2016-2018 model year Volts, increasing the coverage to 15 years or 150,000 miles, whichever comes first. However, owners have reported confusion as this coverage appears to be VIN-specific and may not apply to all vehicles, particularly those originally sold in California Air Resources Board (CARB) states which have their own extended warranties. The 2019 model year is not included in this program. Always check with a GM dealer using your VIN to confirm warranty status.
Symptoms of a Failing BECM
A failing BECM often gives little to no warning and can create a dangerous situation if it occurs while driving. Key symptoms include:
- "Propulsion Power is Reduced" Message: This is one of the most common indicators, often appearing suddenly on the driver information center.
- Complete Loss of Power: The vehicle may abruptly lose all motive power and coast to a stop, sometimes at highway speeds.
- No-Start Condition: The vehicle may refuse to start, either intermittently or permanently.
- Inability to Charge: The vehicle will not accept a charge from an EVSE charging station.
- Check Engine Light with Specific Codes: A failed BECM will trigger the Malfunction Indicator Lamp (MIL) and store a very specific set of Diagnostic Trouble Codes (DTCs).
Associated OBD-II Diagnostic Codes
The most definitive sign of a BECM failure is a cluster of communication-related trouble codes. A scan tool capable of reading GM-specific modules is required for proper diagnosis.
- U2602 through U2625: These codes are the primary indicators cited in TSB 18-NA-261. They signify a loss of communication between the BECM and the individual cell voltage sensors within the battery pack.
- P1E00: This is a generic code that essentially means the engine control module has been told by another module (in this case, the hybrid powertrain control module) that there is a critical fault.
- P0AFA: This code indicates that the hybrid/EV battery system voltage is low, often triggered as a result of the BECM failure.
Warning: A failing 12-volt auxiliary battery can sometimes cause a cascade of communication errors that may mimic a BECM failure. Always test and verify the health of the 12-volt battery in the rear cargo area before condemning the BECM.
Replacement and Programming Requirements
Replacing the BECM is a complex and labor-intensive job that is not recommended for DIY mechanics without specific training and equipment.
- Location: The BECM is not easily accessible. It is located inside the sealed high-voltage battery assembly.
- Procedure: To access the module, a technician must de-energize the high-voltage system and physically remove the entire T-shaped battery pack from the underside of the vehicle.
- Programming is Mandatory: A new or used BECM will not function until it is programmed to the vehicle. This process requires a GM MDI 2 interface tool and an active subscription to GM's Service Programming System (SPS2). This is typically only performed at a GM dealership or a highly specialized independent EV repair shop. Failure to program the module will result in a no-start condition.
Buying a Used Drive Motor Battery Pack Control Module
Given the high cost of a new module and associated labor, a used OEM part can be a cost-effective solution, provided you follow these guidelines.
- Verify the Part Number: The most current part number is 24296900. This part supersedes a long list of previous numbers. While an older part number may work, it's best to source the newest version available, as it may contain updated hardware or firmware to address the original failure mode.
- Buy From a Reputable Source: Purchase from an auto recycler that offers a warranty and guarantees the part is functional. Since you cannot test the module until it is installed and programmed, the seller's guarantee is your primary protection.
- Physical Inspection: While there are no user-serviceable components, inspect the module's casing and connectors for any signs of physical damage, corrosion, or water intrusion. Do not purchase a module that appears damaged.
- Understand the Realities: A used BECM is not a plug-and-play part. The cost savings are on the part itself; you will still face significant labor costs for installation and mandatory programming at a qualified shop or dealership.
Cost Breakdown
The total cost of repair can vary significantly based on warranty status, location, and the parts source.
| Item | Estimated Cost |
|---|---|
| New OEM Module | $350 - $550 (+ $50 Core Charge) |
| Used OEM Module | $100 - $300+ |
| Remanufactured Module | Not commonly available, but repair services may exist for around $225. |
| Shop Labor (Installation & Programming) | $1,000 - $2,000+ |
| Total Out-of-Warranty Cost (New OEM) | $1,900 - $3,000+ |
Frequently Asked Questions (FAQ)
Can I replace the Chevy Volt BECM myself?
This is not recommended for most individuals. The replacement requires dropping the entire 435 lb high-voltage battery pack, which involves specialized lifts, tools, and extensive high-voltage safety training to avoid serious injury or death. The module also requires dealer-level software for programming.
Is the BECM failure covered by a warranty or recall?
There is no official recall. However, GM has a "Special Coverage Program" (N232432680) that extends the warranty on the BECM for many 2016-2018 Volts to 15 years or 150,000 miles. It is critical to have a GM dealer check your VIN to see if your specific vehicle is covered, as not all are.
If my BECM fails, does that mean the entire battery pack is bad?
Not necessarily. The BECM is a single, replaceable electronic module located within the battery pack assembly. In most cases of BECM failure, the lithium-ion battery cells themselves are still perfectly healthy. The repair involves replacing only the faulty control module, not the entire battery.
Will a dealership install a used BECM that I provide?
This depends entirely on the dealership's policy. Many dealerships will not install customer-provided parts, especially for a warranty-related or high-voltage system repair. It is essential to call and confirm with the service department beforehand. An independent shop that specializes in EV repair may be more willing to install a customer-supplied part.
Technical Specifications
OEM Part Numbers: 23263544 23285010 24279214 24283058 24288758 24288760 24289067 24294960 24296900
The module is located inside the main high-voltage battery pack assembly. It communicates with the Hybrid Powertrain Control Module 2 (HPCM2) and monitors individual battery cell groups.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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