maintenance

Diagnostic Scan

for 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Lexus & Toyota Mechanic · 20+ years

Difficulty

Easy

Time

30 min

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

Perform a diagnostic scan on a 2023 Chevrolet Bolt EUV to retrieve diagnostic trouble codes (DTCs) and system data using an OBD-II scanner or manufacturer-specific diagnostic tool.

Warnings

⚠Ensure the high-voltage system is in a safe state before performing diagnostics. Do not attempt high-voltage system repairs without proper EV certification and training.

ℹ️The 2023 Bolt EUV uses a 12V accessory battery for vehicle control modules despite being an electric vehicle. Ensure this battery is in good condition for accurate diagnostics.

ℹ️Some diagnostic functions may require the vehicle to be in 'Ready' mode or charge port connected. Follow scanner prompts for proper vehicle state.

Tools required

OBD-II diagnostic scanner or GM MDI/GDS2 diagnostic toolEssential

Laptop or tablet with compatible diagnostic software (if using advanced tool)

Flashlight or work light

Preparation

Ensure vehicle is parked on level ground in a well-ventilated area
Turn off all accessories (climate control, radio, lights) to reduce electrical load during scanning
Verify 12V battery voltage is at least 12.4V for reliable communication with vehicle modules
Locate the OBD-II diagnostic port under the driver's side dashboard, to the left of the steering column

Procedure

1
Connect Diagnostic Tool
Plug the OBD-II scanner firmly into the 16-pin diagnostic port located under the driver's side dashboard. Ensure the connector is fully seated and locks into place. Power on the scanner if it has a separate power switch.
2
Power Up Vehicle Systems
Press the brake pedal and push the Power button once to place the vehicle in 'ON' or 'Accessory' mode without activating the drive system. This powers the vehicle control modules for communication. Do not shift into Drive or Reverse.
3
Initialize Scanner Communication
On the diagnostic tool, select 'Chevrolet' as the manufacturer, '2023' as the year, and 'Bolt EUV' as the model. Allow the scanner to establish communication with all available vehicle control modules. This may take 30-90 seconds depending on the tool used.
4
Perform System Scan
Select 'Read Codes' or 'Scan All Systems' from the diagnostic menu. The tool will query all accessible modules including Powertrain Control Module (PCM), Battery Energy Control Module (BECM), Body Control Module (BCM), Brake Control Module, HVAC, and charging system modules. Wait for the scan to complete fully.
5
Record Diagnostic Trouble Codes
Document all DTCs displayed, including the code number (e.g., P0A1F), description, and which module reported the code. Note whether codes are current/active or stored/pending. Pay special attention to high-voltage battery codes (P0Axx series) and propulsion system codes (P1xxx series specific to EVs).
6
Retrieve Freeze Frame Data
Access freeze frame data for any stored DTCs. This provides a snapshot of vehicle operating conditions when the code was set, including speed, battery state of charge, temperature, and other parameters. Record this information for diagnostic analysis.
7
Check Live Data Parameters
Navigate to the live data or PID (Parameter Identification) function. Monitor key EV-specific parameters including high-voltage battery state of charge, battery temperature, individual cell voltages (if tool supports), motor temperature, DC-DC converter status, and charging system status. Compare readings to normal operating ranges.
8
Review Module Communication Status
Check the module communication list to verify all expected control modules are responding. Note any modules showing 'No Communication' or 'U' codes (network communication codes), as this may indicate wiring issues or module failures requiring further diagnosis.
9
Save and Export Diagnostic Data
If using an advanced diagnostic tool, save the diagnostic session data including all DTCs, freeze frames, and live data snapshots. Export to a file or print for record-keeping and future comparison. Most basic OBD-II scanners allow manual recording of codes.
10
Disconnect Scanner and Power Down
Exit the diagnostic software properly to close communication with vehicle modules. Press the Power button to turn off the vehicle. Remove the OBD-II scanner from the diagnostic port. Store the scanner and any recorded diagnostic information.

Reassembly

No reassembly required for diagnostic scan procedure

Verification

Confirm all diagnostic trouble codes have been properly recorded with descriptions and freeze frame data
Verify the diagnostic report includes information from all major vehicle systems including propulsion, battery management, charging, and chassis control modules
If codes were present, ensure you have documented the next diagnostic steps or repair procedures needed to address the root cause
Test that vehicle operates normally after diagnostic session with no new warning lights or symptoms introduced by the scanning process

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