P059E - Thermostat Control Circuit Range/Performance Problem in 2016-2019 Ford Mustang and Other Models

Quick Answer

P059E means: P059E indicates a thermostat control circuit problem that can affect engine performance.

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

Can I drive with P059E? Immediate attention is recommended to avoid overheating or engine damage.

Common Questions

What does P059E mean and how does it affect my car?

The P059E code indicates a problem with your vehicle's thermostat control circuit. If this code appears, it may lead to overheating, reduced engine performance, and increased fuel consumption. Long-term neglect can cause severe engine damage.

What are the most common causes of P059E and how much does it cost to fix?

The most common cause of P059E is a faulty thermostat, accounting for about 70% of cases, with repair costs ranging from $150 to $300. Electrical issues and low coolant levels are also frequent culprits. Repair costs can vary widely based on the exact issue.

Can I drive my car with P059E or should I stop immediately?

Driving with a P059E code is risky. It's advisable to stop driving and have the issue diagnosed as it can lead to overheating and severe engine damage.

How can I diagnose P059E myself using GeekOBD APP?

To diagnose P059E using the GeekOBD APP, connect the OBD2 scanner, scan for DTCs, and review the freeze frame data. Then, inspect the thermostat and wiring for faults.

What vehicles are most commonly affected by P059E?

Commonly affected vehicles include 2016-2019 Ford Mustang, Chevrolet Camaro, and some Honda and Toyota models. Always check for recalls or bulletins related to the thermostat.

How can I prevent P059E from happening again?

Prevent P059E by regularly checking coolant levels, ensuring proper maintenance intervals, and replacing the thermostat as needed to avoid mechanical failures.

What is P059E?

The Diagnostic Trouble Code (DTC) P059E indicates a problem with the thermostat control circuit, specifically relating to the thermostat's ability to regulate engine temperature properly. This code typically surfaces when the Engine Control Module (ECM) detects that the thermostat is not functioning within its designed parameters, leading to potential overheating or insufficient heating of the engine. The thermostat is crucial for maintaining optimal engine temperature by controlling the flow of coolant to the engine. When the P059E code is triggered, it can lead to poor engine performance, reduced fuel efficiency, and, if left unaddressed, extensive engine damage. Common vehicles affected include the 2016-2019 Ford Mustang, Chevrolet Camaro, and various models from Honda and Toyota. If your vehicle is showing this code, it’s essential to diagnose the issue promptly. Ignoring it can result in further damage and more expensive repairs down the line. Overall, understanding this code and its implications is vital for maintaining your vehicle's health and performance.

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

Symptoms

Common symptoms when P059E is present:

  • Check engine light stays on constantly, indicating that the engine control module has detected an issue.
  • Engine hesitates during acceleration, which may signal that the engine is not reaching optimal operating temperature.
  • Fuel economy decreased by 10-15%, a result of inefficient engine operation due to improper temperature regulation.
  • Temperature gauge fluctuates or remains at an unusually low level, suggesting that the engine is not warming up adequately.
  • Increased emissions, as the engine may run rich if it doesn't reach the proper operating temperature.

Possible Causes

Most common causes of P059E (ordered by frequency):

  1. A faulty thermostat is the most common cause, with a likelihood of about 70%. This could be due to wear, corrosion, or mechanical failure, preventing it from opening or closing correctly.
  2. Electrical issues in the thermostat control circuit, such as damaged wiring or poor connections, can account for around 20% of P059E occurrences. These can cause incorrect signals to be sent to the ECM.
  3. Low coolant levels can also trigger this code, which can be prevented by regular maintenance checks. This accounts for about 5% of cases.
  4. A malfunctioning engine control module (ECM) is less common but can lead to erroneous readings, making up about 4% of the occurrences.
  5. Rarely, issues with the cooling system, including a clogged radiator or failed water pump, can affect thermostat operation.

P059E Repair Costs

Cost Breakdown by Repair Type

Thermostat Replacement

Replacing the faulty thermostat with a new unit.

  • Total: $150 - $300
  • Success rate: 90%
Circuit Repair

Repairing or replacing damaged wiring in the thermostat control circuit.

  • Total: $100 - $250
  • Success rate: 85%
ECM Replacement

Replacing the engine control module if found faulty.

  • Total: $1,000 - $2,500
  • Success rate: 75%
Money-Saving Tips for P059E
  • 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 P059E Diagnosis Process

Follow these systematic steps to accurately diagnose P059E. 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 thermostat and wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the thermostat and wiring (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 (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes (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 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).

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: Thermostat Replacement on 2017 Ford Mustang

Vehicle: 2017 Ford Mustang, 45,000 miles

Problem: Customer reported a check engine light and fluctuating temperature gauge.

Diagnosis: After scanning for codes, P059E was identified. A visual inspection revealed a stuck thermostat.

Solution: Replaced the thermostat, refilled coolant, and cleared the codes.

Cost: $250 (including parts and labor)

Result: Post-repair, the vehicle ran smoothly with no further issues.

Case Study 2: Wiring Repair on 2018 Chevrolet Camaro

Vehicle: 2018 Chevrolet Camaro, 30,000 miles

Problem: Check engine light illuminated, and engine performance was poor.

Diagnosis: OBD2 scan revealed P059E. Inspection found damaged wiring in the thermostat circuit.

Solution: Repaired the wiring and reconnected the thermostat circuit.

Cost: $180 (parts and labor)

Result: Vehicle performance improved significantly, with no further codes.

Diagnose P059E

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: P059E
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes