Quick Answer
P059A means: The P059A code indicates a problem with the thermostat control circuit, affecting engine temperature regulation.
Can I drive with P059A? Immediate attention is recommended to prevent engine damage.
Common Questions
What does P059A mean and how does it affect my car?
The P059A code indicates that there is a problem with the thermostat control circuit in your vehicle. This can lead to engine overheating or underheating, affecting performance and fuel efficiency. If left unchecked, it can result in severe engine damage.
What are the most common causes of P059A and how much does it cost to fix?
Common causes include a faulty thermostat, wiring issues, and coolant leaks. Repair costs typically range from $150 to $300 for thermostat replacement, while wiring repairs can cost between $100 and $200.
Can I drive my car with P059A or should I stop immediately?
It is not advisable to drive your vehicle if the P059A code is present, as it could lead to overheating and serious engine damage. It's best to address the issue promptly.
How can I diagnose P059A myself using GeekOBD APP?
Using the GeekOBD APP, perform an OBD2 scan to check for the P059A code. Review freeze frame data for temperature readings and other relevant parameters to pinpoint the issue accurately.
What vehicles are most commonly affected by P059A?
The P059A code is commonly reported in vehicles like the 2014-2018 Ford F-150, 2015-2019 Chevrolet Silverado, and several models from Dodge and Jeep. Always check for any recalls or technical service bulletins related to this issue.
How can I prevent P059A from happening again?
To prevent future occurrences of P059A, regularly check and maintain your cooling system, including coolant levels and thermostat inspections. Additionally, ensure that electrical connections are secure and free from corrosion.
What is P059A?
The P059A diagnostic trouble code (DTC) indicates a thermostat control circuit range or performance problem. This code is primarily associated with the operation of the engine's thermostat, which regulates coolant flow and maintains optimal engine temperature. When the vehicle's engine control module (ECM) detects that the thermostat is not functioning within the specified range, it triggers the P059A code. This issue can lead to overheating or underheating of the engine, affecting overall performance and fuel efficiency. In vehicles such as the 2014-2018 Ford F-150 and 2015-2019 Chevrolet Silverado, the symptoms may include poor heater performance, fluctuating engine temperatures, and increased emissions. Ignoring the P059A code can result in significant engine damage over time, making timely diagnosis and repair critical. Drivers may also notice the check engine light illuminating, indicating the need for immediate attention. Regular maintenance, including coolant level checks and thermostat inspections, can help prevent this issue from occurring. Understanding the implications of the P059A code is vital for maintaining the health of your vehicle.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P059A is present:
- The check engine light stays on constantly, indicating a fault that needs attention.
- Engine hesitates during acceleration, potentially due to irregular temperature regulation.
- Fuel economy decreased by 10-15%, as the engine may not be operating at optimal temperatures.
- Poor heater performance inside the cabin, leading to discomfort during colder months.
- Unusual engine noises, which may indicate overheating or thermal stress on engine components.
Possible Causes
Most common causes of P059A (ordered by frequency):
- Faulty thermostat (60% likelihood) - The most common cause is a malfunctioning thermostat that fails to open or close properly, leading to incorrect coolant flow.
- Wiring issues (20%) - Damaged or corroded wiring in the thermostat control circuit can disrupt communication between the thermostat and the ECM.
- Coolant leaks (10%) - A leak in the cooling system can result in insufficient coolant for proper thermostat operation.
- Faulty engine control module (5%) - While rare, a malfunctioning ECM can incorrectly assess the thermostat's performance.
- Faulty temperature sensor (5%) - A defective temperature sensor can provide inaccurate readings, leading to incorrect code triggering.
P059A Repair Costs
Cost Breakdown by Repair Type
Thermostat Replacement
Replacing the faulty thermostat with a new OEM part.
- Total: $150 - $300
- Success rate: 90%
Wiring Repair
Repairing damaged wiring in the thermostat control circuit.
- Total: $100 - $200
- Success rate: 80%
Money-Saving Tips for P059A
- 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 P059A Diagnosis Process
Follow these systematic steps to accurately diagnose P059A. 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 thermostat and its wiring (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the thermostat and its wiring (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive 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: Thermostat Replacement on 2015 Ford F-150
Vehicle: 2015 Ford F-150, 75,000 miles
Problem: Customer reported fluctuating engine temperature and check engine light.
Diagnosis: After scanning, the P059A code was found along with a visual inspection revealing a stuck thermostat.
Solution: Replaced the thermostat and gasket, cleared the codes, and verified proper operation.
Cost: $250 (parts: $50, labor: $200)
Result: Engine temperature stabilized and check engine light remained off during follow-up.
Case Study 2: Wiring Repair on 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado, 50,000 miles
Problem: Customer experienced poor heater performance and check engine light.
Diagnosis: P059A code was confirmed, and wiring to the thermostat was found corroded.
Solution: Repaired wiring connections and replaced the thermostat.
Cost: $180 (parts: $80, labor: $100)
Result: Heater performance improved significantly and no codes returned.