P0B73 - Understanding DTC P0B73: Hybrid Powertrain Fault - Common in 2016-2020 Toyota Prius

Quick Answer

P0B73 means: P0B73 indicates a fault in the hybrid powertrain, specifically related to the battery pack.

Fix: Check and replace faulty components Cost: $2,500 - $4,000 Time: 90-180 minutes

Can I drive with P0B73? Immediate attention is recommended to avoid further damage.

Common Questions

What does P0B73 mean and how does it affect my car?

The P0B73 code indicates a fault in the hybrid battery performance, which can lead to reduced power and efficiency in your vehicle. If not addressed, you may experience serious performance issues or even get stranded due to battery failure.

What are the most common causes of P0B73 and how much does it cost to fix?

Common causes include a failing hybrid battery pack, battery management system failures, or wiring issues. Repair costs can range significantly, from $1,000 for cell replacements to $4,000 for full battery pack replacements.

Can I drive my car with P0B73 or should I stop immediately?

While it may be possible to drive short distances with the P0B73 code, it is highly recommended to seek immediate professional help. Continuing to drive can cause further damage to the hybrid system.

How can I diagnose P0B73 myself using GeekOBD APP?

Using the GeekOBD APP, perform a full system scan to retrieve the P0B73 code along with any additional codes that may be present. Check the freeze frame data for context and observe the battery voltage readings to identify anomalies.

What vehicles are most commonly affected by P0B73?

P0B73 is commonly found in hybrid models like the 2016-2020 Toyota Prius, 2017-2019 Honda Accord Hybrid, and certain Ford Fusion Hybrids, particularly those with mileage over 100,000.

How can I prevent P0B73 from happening again?

Regular maintenance of your hybrid vehicle, including battery inspections and cooling system checks, can help prevent issues. Keeping the battery charged and avoiding extreme temperatures may also extend its lifespan.

What is P0B73?

The diagnostic trouble code P0B73 indicates a problem within the hybrid powertrain system, specifically regarding the 'Hybrid Battery Pack'. This code is prevalent among hybrid vehicles, particularly models like the 2016-2020 Toyota Prius and the 2017-2019 Honda Accord Hybrid. When the vehicle's onboard diagnostics detect an inconsistency in the battery performance or charging system, it triggers this code. The hybrid battery pack plays a crucial role in providing power to the electric motor, which assists in propulsion and improves fuel economy. If there are issues, such as a failing battery cell or a malfunctioning battery management system, the overall performance of the vehicle can be severely affected. Drivers may notice symptoms like reduced power, increased fuel consumption, and in some cases, the vehicle may enter 'limp mode' to protect the hybrid system from further damage. Ignoring this code can lead to more extensive repairs and increased costs down the road, so addressing it promptly is vital for maintaining vehicle performance and efficiency.

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

Symptoms

Common symptoms when P0B73 is present:

  • Check engine light remains illuminated, indicating an ongoing issue with the hybrid system.
  • Vehicle experiences a noticeable reduction in power, especially during acceleration, leading to a sluggish driving experience.
  • Fuel economy decreases significantly, with reports of up to a 20% drop in efficiency, impacting your wallet.
  • Strange noises coming from the hybrid battery area, which can indicate overheating or battery cell failure.
  • Dashboard warning lights related to the hybrid system may illuminate, alerting the driver to potential issues.

Possible Causes

Most common causes of P0B73 (ordered by frequency):

  1. The most common cause is a failing hybrid battery pack, accounting for around 60% of cases. Over time, battery cells can degrade due to heat and wear, leading to performance issues.
  2. Another common cause is a malfunctioning battery management system, which regulates charging and discharging of the battery. If this system fails, it can disrupt the power flow to the electric motor.
  3. Poor connections or damaged wiring within the hybrid system can also trigger this code. Regular inspections can help prevent these issues by ensuring all connections are secure.
  4. Less commonly, overheating due to inadequate cooling can impact battery performance and cause the P0B73 code to appear. Ensure your vehicle’s cooling system is functioning properly.
  5. A rare but possible cause is a software issue within the vehicle's control modules. Updating the software with a dealership can sometimes resolve this issue.

P0B73 Repair Costs

Cost Breakdown by Repair Type

Hybrid Battery Replacement

Replacing the entire hybrid battery pack is often necessary if cells are failing.

  • Total: $2,500 - $4,000
  • Success rate: 95%
Battery Cell Repair

Reconditioning or replacing individual cells can sometimes be more cost-effective.

  • Total: $1,000 - $2,500
  • Success rate: 80%
Money-Saving Tips for P0B73
  • 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 P0B73 Diagnosis Process

Follow these systematic steps to accurately diagnose P0B73. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Conduct an initial visual inspection to identify any loose connections, corrosion, or damaged wiring within the hybrid system (5-10 minutes)

Step 1: Conduct an initial visual inspection to identify any loose connections, corrosion, or damaged wiring within the hybrid system (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: Use the GeekOBD APP to perform an OBD2 scan to retrieve all codes and freeze frame data for a comprehensive view of the issue (10-15 minutes)

Step 2: Use the GeekOBD APP to perform an OBD2 scan to retrieve all codes and freeze frame data for a comprehensive view of the issue (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: Test the hybrid battery pack and associated components with a multimeter or specialized diagnostic tool to check for voltage inconsistencies (20-30 minutes)

Step 3: Test the hybrid battery pack and associated components with a multimeter or specialized diagnostic tool to check for voltage inconsistencies (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: After repairs, perform a system function test to verify that all components are operating correctly and clear any stored codes (10-15 minutes)

Step 4: After repairs, perform a system function test to verify that all components are operating correctly and clear any stored codes (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: Conduct a road test under various driving conditions to confirm that the repairs have resolved the issue (15-20 minutes)

Step 5: Conduct a road test under various driving conditions to confirm that the repairs have resolved the issue (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: Hybrid Battery Replacement on a 2017 Toyota Prius

Vehicle: 2017 Toyota Prius, 85,000 miles

Problem: Customer reported loss of power and check engine light illuminated.

Diagnosis: Diagnostic check revealed P0B73 along with low voltage readings from the hybrid battery.

Solution: Replaced the hybrid battery pack and updated the vehicle's software.

Cost: $3,500 (battery pack $3,200, labor $300)

Result: Vehicle performance restored to optimal levels with improved fuel efficiency.

Case Study 2: Battery Cell Repair on a 2018 Honda Accord Hybrid

Vehicle: 2018 Honda Accord Hybrid, 60,000 miles

Problem: Driver noticed reduced fuel economy and persistent check engine light.

Diagnosis: Found P0B73 indicating battery performance issues with faulty cells.

Solution: Reconditioned the battery and replaced two faulty cells.

Cost: $1,800 (cell replacement costs and labor included)

Result: Fuel economy restored, and customer reported smoother operation.

Diagnose P0B73

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0B73
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes