Quick Answer
P0873 means: P0873 indicates a high input from the transmission fluid pressure sensor circuit.
Can I drive with P0873? Address this issue promptly to avoid severe transmission damage.
Common Questions
What does P0873 mean and how does it affect my car?
P0873 indicates that the transmission fluid pressure sensor is sending a high input signal to your vehicle's ECM, which can negatively affect shifting performance and lead to further transmission issues if not addressed.
What are the most common causes of P0873 and how much does it cost to fix?
The most common causes of P0873 include a faulty transmission fluid pressure sensor, wiring issues, and fluid contamination. Repair costs can range from $150 for a sensor replacement to $100 for wiring repairs.
Can I drive my car with P0873 or should I stop immediately?
While you may be able to drive short distances, it's advisable to address the P0873 code promptly. Ignoring it can lead to more significant transmission damage and costly repairs.
How can I diagnose P0873 myself using GeekOBD APP?
To diagnose P0873 using the GeekOBD APP, connect the app to your OBD2 port, retrieve the diagnostic codes, and review the freeze frame data to understand the conditions under which the code was triggered.
What vehicles are most commonly affected by P0873?
P0873 is commonly seen in vehicles like the 2007-2018 Ford F-150, Chevrolet Silverado, and GMC Sierra. Always check for any recalls or technical service bulletins (TSBs) related to your specific vehicle.
How can I prevent P0873 from happening again?
Regular maintenance, including timely transmission fluid changes and inspections of the wiring and connectors, can help prevent P0873 from reoccurring.
What is P0873?
The diagnostic trouble code (DTC) P0873 indicates an issue with the transmission fluid pressure sensor circuit, specifically that the circuit input is too high. This code is often triggered when the Engine Control Module (ECM) detects a voltage level from the fluid pressure sensor that exceeds manufacturer specifications, which can lead to improper transmission operation. The transmission fluid pressure sensor plays a crucial role in monitoring the hydraulic pressure within the transmission, allowing the ECM to optimize shifting patterns and enhance performance. If this sensor is malfunctioning, it can lead to erratic shifting, decreased fuel efficiency, and even potential damage to the transmission system. In practical terms, if you ignore this code, you may experience more severe transmission issues down the road, resulting in costly repairs. It's vital to address this issue promptly to maintain your vehicle's performance and longevity, especially in popular models such as the Ford F-150, Chevrolet Silverado, and GMC Sierra. Understanding P0873 can help you take proactive steps to diagnose and repair the problem before it escalates.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0873 is present:
- Check engine light stays on constantly, indicating a persistent issue with the transmission system.
- Engine hesitates during acceleration, which may cause a feeling of lag or delayed response when you press the gas pedal.
- Fuel economy decreased by 10-15%, resulting in more frequent trips to the gas station and higher fuel costs.
- Rough shifting between gears, leading to a jarring driving experience and potential discomfort.
- Transmission slipping or failing to engage properly, which can be dangerous in certain driving conditions.
Possible Causes
Most common causes of P0873 (ordered by frequency):
- Faulty transmission fluid pressure sensor - This is the most common cause, occurring in about 60% of cases. A defective sensor can send incorrect readings to the ECM, leading to code P0873.
- Wiring issues - Damaged, corroded, or loose wiring can impact the signal sent to the ECM. This issue accounts for around 25% of P0873 occurrences, making it essential to inspect wiring thoroughly.
- Fluid contamination - Contaminated transmission fluid can affect sensor performance. Regular fluid changes can help prevent this issue from arising.
- ECM problems - Although rare, a malfunctioning ECM can misinterpret sensor data. This is less common but can occur in aging vehicles.
- Mechanical transmission issues - Problems within the transmission itself, although infrequent, can lead to incorrect pressure readings.
P0873 Repair Costs
Cost Breakdown by Repair Type
Transmission Fluid Pressure Sensor Replacement
Replacing the faulty sensor can resolve the P0873 code effectively.
- Total: $150 - $300
- Success rate: 85%
Wiring Repair
Repairing damaged wiring may be necessary if the sensor is functioning correctly.
- Total: $100 - $200
- Success rate: 75%
Money-Saving Tips for P0873
- 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 P0873 Diagnosis Process
Follow these systematic steps to accurately diagnose P0873. 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).
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).
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the fluid pressure sensor and wiring (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the fluid pressure sensor and wiring (20-30 minutes).
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).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes).
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: P0873 Resolution on a 2015 Ford F-150
Vehicle: 2015 Ford F-150, 80,000 miles
Problem: Customer reported check engine light and rough shifting during acceleration.
Diagnosis: Performed a diagnostic scan revealing P0873. Inspected the transmission fluid pressure sensor and wiring.
Solution: Replaced the faulty transmission fluid pressure sensor and cleared the codes.
Cost: $250 (sensor: $150, labor: $100)
Result: Customer reported smooth shifting and improvement in fuel economy after repairs.
Case Study 2: Fixing High Input Signal in a 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado, 65,000 miles
Problem: Check engine light and slipping transmission during gear shifts.
Diagnosis: Diagnosed P0873 through OBD2 scan, confirmed wiring issues.
Solution: Repaired corroded wiring and reset the ECM.
Cost: $150 (labor included)
Result: Transmission performance returned to normal, and no further issues were reported.