Quick Answer
P0958 means: The P0958 code indicates a high voltage input from the transmission fluid pressure sensor, signaling a possible issue with the transmission system.
Can I drive with P0958? Immediate attention is recommended to prevent potential transmission damage.
Common Questions
What does P0958 mean and how does it affect my car?
The P0958 code means your vehicle's transmission fluid pressure sensor is sending a high voltage signal. This could lead to harsh shifting, slipping gears, or even total transmission failure if not addressed. The check engine light may illuminate, and you might notice performance issues like hesitation or rough gear changes.
What are the most common causes of P0958 and how much does it cost to fix?
Common causes include a faulty pressure sensor, wiring issues, or low transmission fluid. Repair costs can range from $150 for sensor replacement to over $1200 for ECM replacement, depending on the underlying issue.
Can I drive my car with P0958 or should I stop immediately?
It's not advisable to drive your vehicle if the P0958 code is present. Continuing to drive could exacerbate transmission damage, leading to more costly repairs.
How can I diagnose P0958 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for the P0958 code, view freeze frame data, and check other related codes. It helps you understand the context of the fault and assists in pinpointing the issue more effectively.
What vehicles are most commonly affected by P0958?
The P0958 code is frequently reported in vehicles like the 2015-2018 Honda Civic, Ford Fusion (2013-2016), and Toyota Camry (2012-2017). Always check for any recalls or Technical Service Bulletins (TSBs) related to this code for your specific model.
How can I prevent P0958 from happening again?
To prevent recurrence, ensure regular transmission fluid changes, inspect wiring and connectors for wear, and address any warning lights promptly. Routine maintenance can go a long way in preventing sensor and transmission issues.
What is P0958?
The Diagnostic Trouble Code (DTC) P0958 indicates an issue with the transmission fluid pressure sensor circuit, specifically that it is receiving a high voltage input. This code is relevant for vehicles equipped with automatic transmissions that utilize a fluid pressure sensor to monitor the pressure levels within the transmission system. When the sensor detects a voltage above the manufacturer's specified range, it triggers this code. High input can lead to a range of transmission issues, including harsh shifting, slipping gears, or complete transmission failure. For car owners, this can manifest as a check engine light on the dashboard, and it often requires prompt diagnosis and repair to avoid further damage. If left unaddressed, it could lead to higher repair costs down the line, as transmission components may wear out faster due to improper pressure readings. It’s crucial for drivers to understand the implications of this code and seek diagnostic services to correct any underlying issues promptly.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0958 is present:
- Check engine light stays on constantly, indicating an ongoing issue with the transmission.
- Engine hesitates during acceleration, leading to a lack of power or jerking motions while driving.
- Fuel economy decreased by 10-15%, resulting in more frequent trips to the gas station.
- Unusual noises coming from the transmission, such as grinding or whining when shifting gears.
- Difficulty in shifting gears, where the transmission may refuse to change smoothly or at all.
Possible Causes
Most common causes of P0958 (ordered by frequency):
- Faulty transmission fluid pressure sensor - This is the most common cause, accounting for about 60% of cases. The sensor may fail due to wear and tear, resulting in incorrect readings.
- Wiring issues - Damaged or corroded wiring can disrupt the signal from the sensor to the Engine Control Module (ECM), leading to false readings.
- Low transmission fluid levels - Insufficient fluid can affect pressure readings, potentially causing the sensor to detect high pressure erroneously.
- Faulty ECM - In rare cases, the engine control module itself may malfunction, misinterpreting the sensor's data.
- Sensor calibration issues - If the sensor is not calibrated correctly after installation or maintenance, it may send incorrect signals.
P0958 Repair Costs
Cost Breakdown by Repair Type
Transmission Fluid Pressure Sensor Replacement
Replacing the faulty transmission fluid pressure sensor to restore proper functionality.
- Total: $150 - $300
- Success rate: 85%
Wiring Repair
Repairing or replacing damaged wiring associated with the sensor circuit.
- Total: $100 - $250
- Success rate: 80%
ECM Reprogramming
Reprogramming or replacing the Engine Control Module if it is determined to be faulty.
- Total: $500 - $1200
- Success rate: 75%
Money-Saving Tips for P0958
- 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 P0958 Diagnosis Process
Follow these systematic steps to accurately diagnose P0958. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 2: 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 3: Step 3
Step 3: Component testing - Use a multimeter to test the voltage output of the transmission pressure sensor (20-30 minutes)
Step 4: Step 4
Step 4: System function test - Verify the operation of the sensor and the transmission system after repairs and clear codes (10-15 minutes)
Step 5: Step 5
Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the issue has been resolved (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: Transmission Pressure Sensor Replacement on 2016 Honda Civic
Vehicle: 2016 Honda Civic, 45,000 miles
Problem: Customer reported illuminated check engine light and rough shifting.
Diagnosis: Diagnostic scan revealed P0958 code. Visual inspection found the pressure sensor wiring was frayed.
Solution: Replaced the transmission fluid pressure sensor and repaired the damaged wiring.
Cost: $250 (sensor: $150, labor: $100)
Result: Customer noted smooth shifting post-repair and no reoccurrence of the check engine light.
Case Study 2: Wiring Repair for 2014 Ford Fusion
Vehicle: 2014 Ford Fusion, 60,000 miles
Problem: Driver experienced harsh shifting and check engine light.
Diagnosis: P0958 code was present; wiring inspection revealed corrosion at the connector.
Solution: Cleaned the connector and replaced the damaged wiring harness.
Cost: $180 (labor: $80, parts: $100)
Result: The harsh shifting issue was resolved, and the check engine light remained off after repairs.