P0E73 - Electric Vehicle Battery Heater Performance Issue in 2016-2020 Chevrolet Volt and Similar Models

Quick Answer

P0E73 means: P0E73 indicates a malfunction with the battery heater in hybrid/electric vehicles.

Fix: Check and replace faulty components Cost: $300 - $800 Time: 90-180 minutes

Can I drive with P0E73? Immediate attention is recommended to prevent battery damage.

Common Questions

What does P0E73 mean and how does it affect my car?

The P0E73 code signifies an issue with the battery heater system in your hybrid or electric vehicle. This can lead to reduced battery performance, especially in cold weather. If not addressed, it can affect your vehicle's range and overall battery health.

What are the most common causes of P0E73 and how much does it cost to fix?

Common causes of P0E73 include a faulty battery heater, issues with the battery management system, or corroded wiring. Repair costs can range from $300 to $800 depending on the specific issue and required parts.

Can I drive my car with P0E73 or should I stop immediately?

While you may still be able to drive your vehicle, it is advised to address the P0E73 code as soon as possible. Continuing to drive with this issue can lead to severe battery damage and costly repairs.

How can I diagnose P0E73 myself using GeekOBD APP?

To diagnose P0E73 using the GeekOBD APP, connect the app to your vehicle, retrieve the diagnostic codes, and review the freeze frame data. This will help you understand how the fault developed and whether further inspection is needed.

What vehicles are most commonly affected by P0E73?

Vehicles like the 2016-2020 Chevrolet Volt, Nissan Leaf, and 2017-2019 BMW i3 are commonly affected by P0E73. Check for any recalls or technical service bulletins related to battery heater issues.

How can I prevent P0E73 from happening again?

To prevent P0E73 from recurring, ensure regular maintenance checks on your battery system, keep the battery clean, and inspect connections for corrosion. Consider using the GeekOBD APP for routine diagnostics.

What is P0E73?

The DTC code P0E73 indicates a problem with the battery heater performance in hybrid and electric vehicles, particularly in models like the 2016-2020 Chevrolet Volt. This code suggests that the battery management system has detected that the battery heater is not functioning as intended. The battery heater is crucial for maintaining optimal battery temperature, especially in colder climates. When the battery temperature drops too low, it can lead to reduced performance, diminished range, and even potential damage to the battery cells over time. Owners may experience symptoms such as decreased electric range and a warning light on the dashboard. Ignoring this code can lead to long-term battery health issues, costly repairs, and decreased overall vehicle efficiency. It's essential for car owners to address this issue promptly to ensure the reliability and longevity of their hybrid or electric vehicle. Regular maintenance checks and diagnostics using tools like the GeekOBD APP can help identify and resolve these issues before they escalate.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0E73 is present:

  • The check engine light illuminates and stays on continuously, indicating a fault that requires diagnostics.
  • Drivers may notice that the vehicle's electric range is significantly less than expected, potentially dropping by as much as 20-30%.
  • During cold weather, the vehicle may struggle to provide adequate heating for the cabin, impacting comfort and safety.
  • There may be unusual noises from the battery area, such as clicking or humming, which can indicate a malfunctioning heater system.
  • The vehicle may experience longer charging times or difficulty maintaining charge, leading to potential range anxiety.

Possible Causes

Most common causes of P0E73 (ordered by frequency):

  1. The most common cause of P0E73 is a faulty battery heater assembly, which occurs in approximately 60% of cases. This can result from wear and tear or manufacturing defects.
  2. Another frequent cause is a malfunctioning battery management system (BMS), which misreads the heater's performance due to software issues or sensor failures.
  3. Corroded wiring or poor connections within the battery heater circuit can also lead to P0E73. Regular inspection can help prevent this issue.
  4. Less commonly, a blown fuse related to the battery heater system may trigger this code, which is usually straightforward to repair.
  5. In rare cases, a complete battery replacement may be necessary if the heater has caused significant damage to the battery cells.

P0E73 Repair Costs

Cost Breakdown by Repair Type

Battery Heater Replacement

Replacing the faulty battery heater assembly with a new OEM part to restore function.

  • Total: $300 - $800
  • Success rate: 85%
Battery Management System Reprogramming

Reprogramming or updating the battery management system software to correct sensor readings.

  • Total: $100 - $300
  • Success rate: 70%
Money-Saving Tips for P0E73
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P0E73 Diagnosis Process

Follow these systematic steps to accurately diagnose P0E73. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Begin by checking for any visible damage to the battery heater wiring or connectors

Step 1: Initial visual inspection - Begin by checking for any visible damage to the battery heater wiring or connectors. Look for signs of wear or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Connect the GeekOBD APP to your vehicle’s OBD2 port to retrieve diagnostic codes and freeze frame data

Step 2: OBD2 scan with GeekOBD APP - Connect the GeekOBD APP to your vehicle’s OBD2 port to retrieve diagnostic codes and freeze frame data. This will give context to the fault (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter to measure the resistance of the battery heater and check for continuity in the wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter to measure the resistance of the battery heater and check for continuity in the wiring (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - After repairs, perform a function test to ensure the battery heater operates correctly and clear the DTC from the system (10-15 minutes)

Step 4: System function test - After repairs, perform a function test to ensure the battery heater operates correctly and clear the DTC from the system (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Conduct a road test to confirm that the vehicle operates smoothly and check for any reoccurrence of the code (15-20 minutes)

Step 5: Road test verification - Conduct a road test to confirm that the vehicle operates smoothly and check for any reoccurrence of the code (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Battery Heater Replacement on a 2018 Chevrolet Volt

Vehicle: 2018 Chevrolet Volt, 45,000 miles

Problem: Customer reported a check engine light and reduced electric range.

Diagnosis: Diagnostic scan revealed error code P0E73. Visual inspection showed signs of corrosion on the battery heater connections.

Solution: Replaced the battery heater assembly and repaired corroded connections.

Cost: $600 (parts: $400, labor: $200)

Result: Post-repair, the vehicle's range improved, and the check engine light was cleared.

Case Study 2: BMS Software Update on a 2019 Nissan Leaf

Vehicle: 2019 Nissan Leaf, 30,000 miles

Problem: Warning light appeared intermittently with no apparent performance issues.

Diagnosis: P0E73 was retrieved; further testing indicated a software glitch in the battery management system.

Solution: Performed a software update for the BMS without any parts replacement.

Cost: $150 (labor only)

Result: The vehicle operated normally after the update, with no further issues reported.

Diagnose P0E73

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
Download GeekOBD APP Get MOBD Adapter

Code Information

Code: P0E73
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes