P073B - Transmission Range Sensor Performance Problem (Common in 2015-2018 Ford Focus, 2016-2019 Chevrolet Malibu)

Quick Answer

P073B means: P073B indicates a problem with the transmission range sensor's performance.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with P073B? Immediate attention is recommended to avoid further transmission damage.

Common Questions

What does P073B mean and how does it affect my car?

The P073B code indicates a problem with the transmission range sensor, which can affect how your vehicle shifts gears. If left unresolved, it may lead to poor performance, decreased fuel efficiency, and potential transmission damage.

What are the most common causes of P073B and how much does it cost to fix?

Common causes of P073B include a faulty transmission range sensor, poor electrical connections, and low transmission fluid levels. Repair costs can range from $80 for fluid changes to $300 for sensor replacements.

Can I drive my car with P073B or should I stop immediately?

It is not advisable to drive your vehicle with a P073B code, as it can lead to unsafe driving conditions and further transmission damage. Immediate attention is recommended.

How can I diagnose P073B myself using GeekOBD APP?

Using the GeekOBD APP, you can perform a scan of your vehicle to retrieve diagnostic trouble codes and freeze frame data. This will help you identify the issue and monitor any changes after repairs.

What vehicles are most commonly affected by P073B?

P073B is commonly found in vehicles such as the 2015-2018 Ford Focus and 2016-2019 Chevrolet Malibu. Always check for any recalls or TSBs related to your specific make and model.

How can I prevent P073B from happening again?

Regular maintenance, including fluid changes and inspections of the transmission range sensor and wiring, can help prevent future occurrences of P073B.

What is P073B?

The diagnostic trouble code (DTC) P073B indicates a performance issue with the transmission range sensor. This sensor monitors the position of the transmission gear selector and relays this information to the engine control module (ECM). If the ECM detects that the signal from the sensor is out of range or inconsistent, it triggers the P073B code. This can lead to various driving issues, such as the transmission not shifting properly or engaging in the wrong gear. In a vehicle, this could result in poor acceleration, unexpected engine revving, and even stalling. Additionally, the Check Engine Light (CEL) will typically illuminate, prompting drivers to seek diagnostics. Understanding this code is crucial because neglecting it can lead to further transmission damage and costly repairs in the future. Therefore, it is essential to address the issue promptly to ensure safe and smooth vehicle performance.

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

Symptoms

Common symptoms when P073B is present:

  • Check engine light stays on constantly, indicating a fault that requires immediate attention.
  • Engine hesitates during acceleration, which can lead to unsafe driving conditions.
  • Fuel economy decreased by 10-15%, signaling potential inefficiencies in the transmission system.
  • Transmission may get stuck in one gear, causing a lack of responsiveness during driving.
  • Unusual noises from the transmission area, such as grinding or whining sounds, may indicate internal issues.

Possible Causes

Most common causes of P073B (ordered by frequency):

  1. The most common cause is a faulty transmission range sensor, which accounts for about 60% of P073B cases. This sensor can become worn or damaged over time, leading to inaccurate readings.
  2. Another common cause is a poor electrical connection or damaged wiring to the sensor. Corrosion or frayed wires can disrupt the signal, leading to a P073B code.
  3. Thirdly, low transmission fluid levels can affect the sensor's performance. Regular maintenance and fluid checks can help prevent this issue.
  4. Less common but serious causes include internal transmission damage, which may require a complete transmission rebuild.
  5. A rare cause could be a software glitch in the vehicle's ECM, which may require an update or reprogramming to resolve the P073B code.

P073B Repair Costs

Cost Breakdown by Repair Type

Transmission Range Sensor Replacement

Replacing the faulty transmission range sensor to restore proper functionality.

  • Total: $150 - $300
  • Success rate: 85%
Wiring Repair or Replacement

Fixing or replacing damaged wiring and connectors associated with the transmission range sensor.

  • Total: $100 - $200
  • Success rate: 75%
Transmission Fluid Change

Changing low or contaminated transmission fluid to ensure optimal sensor performance.

  • Total: $80 - $150
  • Success rate: 60%
Money-Saving Tips for P073B
  • 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 P073B Diagnosis Process

Follow these systematic steps to accurately diagnose P073B. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, 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 - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (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 or specific diagnostic tools to test the transmission range sensor and wiring for faults (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the transmission range sensor and wiring for faults (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 - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (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 - Drive the vehicle under various conditions to confirm repair success and ensure the symptom is resolved (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the symptom is resolved (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: Transmission Range Sensor Replacement on a 2017 Ford Focus

Vehicle: 2017 Ford Focus, 45,000 miles

Problem: Customer reported engine hesitation and the check engine light illuminated.

Diagnosis: Scanned vehicle with GeekOBD APP, retrieving P073B code. Visual inspection revealed a faulty transmission range sensor.

Solution: Replaced the transmission range sensor and cleared the code.

Cost: $250 (sensor $150, labor $100)

Result: Customer reported improved acceleration and no further check engine light.

Case Study 2: Wiring Repair on a 2016 Chevrolet Malibu

Vehicle: 2016 Chevrolet Malibu, 60,000 miles

Problem: Driver experienced erratic shifting and a persistent check engine light.

Diagnosis: Using the GeekOBD APP, the P073B code was confirmed. A visual inspection found corroded wiring.

Solution: Repaired and reconnected the damaged wiring to the transmission range sensor.

Cost: $120 (labor and wiring materials)

Result: Shifting issues resolved, and the check engine light remained off.

Diagnose P073B

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: P073B
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes