# Voltage: Volt Ampera Bolt OBD — GM EV Diagnostic & Control

> GM EV/hybrid diagnostic and control app for Volt, Ampera, Bolt models. (iPhone/iPad app by Oleksandr Radchenko.)

- Source: https://appshunter.io/ios/app/voltage-volt-ampera-bolt-obd/id6774315064 (this page in markdown: same URL + `.md`)
- Developer: [Oleksandr Radchenko](https://appshunter.io/developer/6774315066)
- Category: Utilities
- Price: Free with in-app purchases
- Rating: 4.00/5 from 4 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.2 · 54 MB
- Languages: American English
- Released: 2026-06-28
- Data updated: 2026-08-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/voltage-volt-ampera-bolt-obd/id6774315064/reviews.md

## What is Voltage?

The most comprehensive diagnostic and control app for Chevrolet Volt / Opel Ampera / Vauxhall Ampera / Holden Volt. 
Chevy Bolt and Opel Ampera-E are currently supported from 2017 to 2023. 
Connect via a supported ELM327 Bluetooth LE or Wi-Fi OBD2 adapter and take full command of your vehicle.

RECOMMENDED ADAPTERS
 For full compatibility — SW-CAN access, HVAC and Infotainment communication, remote start, and door unlock — use an OBDLink MX+ or vLinker MS. Bluetooth LE and Wi-Fi adapters provide limited compatibility.

ENHANCED VEHICLE CONTROL 
• Remote start (pre-conditioning) and climate control within Bluetooth range for vehicles before 2019 
• Battery heater for improved cold-weather range 
• Charge management and scheduling 
• Remote door and window operation 
• Engine control with ON / OFF / Release support 
• Wake the car remotely to query modules without powering it on 
• Module reset and DTC clearing

HV UNLOCK FUNCTION
"Unbrick" your car and stay on the road with the HV Unlock function. Enable charging on Ampera 2012 by resetting the Service High Voltage Charging System.

PROFESSIONAL DIAGNOSTICS
 • Deep DTC scan across all discovered modules, including SW-CAN network access
 • 100+ live parameters with two-column monitoring mode
 • Real-time battery pack analysis: cell voltages, temperatures, BECM voltage & current
 • Weak Cell active test with guided instructions and a clear verdict
 • Battery Coolant Pump and heater control with feedback values and charts
 • HW Info with module programming dates and ECM calibrations

MONITORING PARAMETERS 
Nine dedicated screens, every value charted in real time: 
• Efficiency — State of Charge (displayed & raw), EV range, kWh used, EV efficiency, fuel efficiency (hybrid) 
• Powertrain — HV power, HV current, HV inverter voltage, transmission fluid temp, MGA & MGB motor temps, aux transmission pump speed, gear shifter position. For hybrids it also reports engine speed, engine oil & coolant temps, EGR commanded (Gen 2), EGR cooler temps (Gen 2), and HPCM engine-startup reason. 
• HV Battery — Pack voltage, internal resistance, cell delta, average and minimum cell voltage, six individual battery temps, battery coolant temp & speed, battery heater power, battery conditioning mode, outside/inside temps, and the last five charging-session histories. 
• Charger — Charger state, charging level, AC input voltage/current/power, DC output voltage/current/power, charging-system status, and (2016+) AC & DC duty cycles. 
• Charger Plus — Extended charger diagnostics, including duty-cycle on 2016+ vehicles. 
• Climate — HVAC target temp, windshield temp, cabin heat power, AC power, AC speed, blower speed, HVAC coolant temp (2016+), outside & inside temps, and remote-start counters. 
• 12V — 12V voltage, current, power, state of charge, charging state, maintenance mode. 
• 12V Power (per-module) — Individual 12V supply voltage reported by every major control module: ECM, HPCM1, MGA, MGB, HPCM2, BECM, EBCM, Brake Booster, EPS, ASCM, HVAC and Radio. Power-electronics coolant temp and pump speed included. 
• TPMS — Live tire pressure for all four wheels.

VEHICLE HISTORY & DATA MANAGEMENT 
• Full history view with vehicle selection and deletion 
• Export, import, and edit your vehicle history with the built-in editor 

HEALTH INSIGHTS
Critical vehicle health analysis and maintenance recommendations — ideal for DIY enthusiasts, used car buyers checking battery health, and owners tracking long-term performance.

POLISHED EXPERIENCE 
Modern UI with Dark / Light / System theme support, a bottom status bar for at-a-glance status, and full multi-language support.

## Key features

- Deep DTC scanning
- Live parameter monitoring
- Real-time battery analysis
- HV Unlock function
- Remote start and climate control
- Charge management and scheduling
- Module reset and clearing

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium upgrade | $24.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/voltage-volt-ampera-bolt-obd/id6774315064/reviews.md

### 1/5 — no trial or free features

*2026-07-21*

everything is locked behind a paywall and nothing useful is made available for free, making it impossible to gauge how useful/effective the paid version of the app could be.

## Frequently asked questions about Voltage

### What vehicles does Voltage support?

Voltage supports Chevrolet Volt, Opel Ampera, Vauxhall Ampera, Holden Volt, Chevy Bolt, and Opel Ampera-E models from 2017 to 2023. It requires a compatible ELM327 Bluetooth LE or Wi-Fi OBD2 adapter for connection.

### What are the benefits of using Voltage?

Voltage offers comprehensive diagnostics, real-time monitoring of over 100 parameters including battery health, and enhanced control features like remote start, climate control, and charge scheduling for supported vehicles.

### Does Voltage have ads?

No, Voltage does not contain advertisements. It is a free application that focuses on providing diagnostic and control features without interruptions.

### What adapter is recommended for full functionality?

For full compatibility, including SW-CAN access, HVAC and Infotainment communication, remote start, and door unlock, an OBDLink MX+ or vLinker MS adapter is recommended. Bluetooth LE and Wi-Fi adapters offer limited compatibility.

### Can Voltage help with charging issues?

Yes, Voltage includes charge management and scheduling features. It also has an HV Unlock function that can reset the Service High Voltage Charging System, potentially enabling charging on Ampera 2012 models.

### How often is Voltage updated?

The latest version of Voltage is 2.2.2, which was last updated on July 7, 2026. Updates typically include improvements and support for newer vehicle models or features.

### What is the rating for Voltage?

Voltage has a rating of 5.0 stars from 1 rating, indicating a highly positive user experience among its current reviewers.

### Is Voltage available on Android?

Based on the provided data, Voltage is currently supported on iPhones. Information regarding Android availability is not specified.

## Version history (last 4 releases)

### 2.2.3 — 2026-07-14

Bug Fix Release
Fixes and improvements following the 2.2.2 update

### 2.2.2 — 2026-07-07

Bug fix release after 2.2.1:
- SW-CAN adapter detection bug fix
- Wi-Fi OBD adapters connectivity fix
- Other improvements

### 2.2.1 — 2026-07-01

Bug Fix Release
Fixes and improvements following the major 2.2.0 update

### 2.2.0 — 2026-06-28

No release notes.

## Related topics

[chevy bolt](https://appshunter.io/ios/topics/chevy-bolt) · [chevy bolt app](https://appshunter.io/ios/topics/chevy-bolt-app)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-11.*