Quick Answer
P0985 means: DTC P0985 indicates a malfunction with the transmission fluid temperature sensor.
Can I drive with P0985? Immediate attention is recommended to prevent further transmission damage.
Common Questions
What does P0985 mean and how does it affect my car?
The P0985 code indicates a malfunction with the transmission fluid temperature sensor. This can lead to improper shifting, overheating, and reduced transmission efficiency. If not addressed, it could result in significant damage and costly repairs.
What are the most common causes of P0985 and how much does it cost to fix?
The most common cause is a faulty sensor, which can cost between $150 and $300 to replace. Other potential causes include damaged wiring and low transmission fluid, with repair costs varying based on the issue.
Can I drive my car with P0985 or should I stop immediately?
It's advisable to stop driving if you see the P0985 code, as it indicates a serious issue with the transmission that could lead to failure. Driving under these conditions can exacerbate the problem.
How can I diagnose P0985 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for DTC codes, view live data from the transmission fluid temperature sensor, and analyze freeze frame data to understand the context of the fault. This tool helps guide you in identifying the issue.
What vehicles are most commonly affected by P0985?
Common vehicles that experience P0985 include the 2015-2020 Ford F-150 and 2016-2020 Chevrolet Silverado. These models have been reported to have issues with the transmission fluid temperature sensor.
How can I prevent P0985 from happening again?
To prevent P0985, maintain regular transmission fluid changes, inspect wiring for damage, and address any unusual transmission behavior immediately to avoid sensor failure.
What is P0985?
The DTC P0985 pertains to a problem with the transmission fluid temperature sensor. This code indicates that the Engine Control Module (ECM) has detected a malfunction with the sensor that monitors the temperature of the transmission fluid. This sensor plays a crucial role in ensuring optimal transmission function by providing real-time data to the ECM, which adjusts the transmission fluid flow accordingly. When the sensor sends readings outside of expected parameters, it triggers the P0985 code. This can lead to various transmission issues, including shifting problems, overheating, or even complete transmission failure if not addressed promptly. In the real world, drivers may experience symptoms such as erratic shifting, delayed engagement when shifting gears, and in severe cases, a complete loss of transmission function. It's essential to diagnose and repair this issue as soon as possible to avoid extensive damage and costly repairs. Understanding the implications of DTC P0985 can help car owners take proactive measures to maintain their vehicle's performance and longevity.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0985 is present:
- Check engine light illuminates or blinks unexpectedly, indicating a transmission-related problem.
- Transmission may hesitate during gear changes, leading to a rough driving experience.
- Fuel economy may decrease by 10-20%, as the transmission struggles to operate efficiently.
- Overheating of the transmission, which can lead to burning smells and potential transmission failure.
- Erratic shifting patterns, where the vehicle may shift too early or too late.
Possible Causes
Most common causes of P0985 (ordered by frequency):
- The most common cause of P0985 is a faulty transmission fluid temperature sensor, accounting for approximately 60% of cases. This can occur due to wear and tear over time or exposure to harsh conditions.
- Another possible cause is damaged wiring or connectors related to the sensor, which can disrupt the transmission of accurate data to the ECM. Regular inspections can help prevent this.
- In some cases, low transmission fluid levels or contaminated fluid can lead to erroneous temperature readings, stressing the importance of regular maintenance and fluid checks.
- Less commonly, software issues within the ECM may cause incorrect readings from the sensor. Updating the car’s software may be necessary in these situations.
- Rarely, mechanical issues within the transmission itself can lead to abnormal temperature readings, warranting a thorough inspection.
P0985 Repair Costs
Cost Breakdown by Repair Type
Sensor Replacement
Replacing the faulty transmission fluid temperature sensor to restore proper functionality.
- Total: $150 - $300
- Success rate: 90%
Wiring Repair
Repairing or replacing damaged wiring or connectors associated with the sensor.
- Total: $100 - $250
- Success rate: 85%
Fluid Flush
Performing a complete transmission fluid flush if contamination is detected.
- Total: $120 - $200
- Success rate: 80%
Money-Saving Tips for P0985
- 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 P0985 Diagnosis Process
Follow these systematic steps to accurately diagnose P0985. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Perform an initial visual inspection of the transmission wiring and connectors, looking for signs of damage or corrosion (5-10 minutes)
Step 1: Perform an initial visual inspection of the transmission wiring and connectors, looking for signs of damage or corrosion (5-10 minutes).
Step 2: Step 2: Use an OBD2 scanner or the GeekOBD APP to retrieve all trouble codes and freeze frame data to understand the fault context (10-15 minutes)
Step 2: Use an OBD2 scanner or the GeekOBD APP to retrieve all trouble codes and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Test the transmission fluid temperature sensor using a multimeter to verify its resistance and functionality (20-30 minutes)
Step 3: Test the transmission fluid temperature sensor using a multimeter to verify its resistance and functionality (20-30 minutes).
Step 4: Step 4: After any repairs, conduct a system function test to ensure the transmission operates correctly and clear the DTC codes (10-15 minutes)
Step 4: After any repairs, conduct a system function test to ensure the transmission operates correctly and clear the DTC codes (10-15 minutes).
Step 5: Step 5: Perform a road test under various operating conditions to confirm successful repair and that no codes reappear (15-20 minutes)
Step 5: Perform a road test under various operating conditions to confirm successful repair and that no codes reappear (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 Overheating in 2018 Ford F-150
Vehicle: 2018 Ford F-150 XLT, 45,000 miles
Problem: Customer reported transmission overheating and erratic shifting.
Diagnosis: Diagnostic scan revealed DTC P0985. Visual inspection showed corroded wiring to the temperature sensor.
Solution: Repaired the wiring and replaced the transmission fluid temperature sensor.
Cost: $280 (parts and labor included)
Result: Resolved overheating issues and restored smooth shifting.
Case Study 2: Erratic Shifting in 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado 1500, 60,000 miles
Problem: Driver experienced rough and delayed shifting.
Diagnosis: P0985 was detected during OBD2 scan; sensor tested faulty.
Solution: Replaced the faulty temperature sensor and performed a transmission fluid flush.
Cost: $220 (including parts and labor)
Result: Shifting returned to normal, and driver reported improved performance.