C1064 on 2015-2019 Ford Edge: Understanding This Connector Code

What's Unique About the 2015-2019 Ford EDGE

On the second-generation Ford Edge, the term 'C1064' appears in official service literature, but only as a connector name, not a fault code. This is a common point of confusion. While other manufacturers, like Dodge, may use C1064 as an ABS-related trouble code, for this specific Ford platform, it exclusively refers to a physical part of the wiring harness. The issue highlighted in Ford TSB #SSM 47791 is a potential for a poor connection or damaged wiring between this connector and others (C1016 and C1168) in the engine control system.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Generation note: The 2015-2019 model years all belong to the second generation of the Ford Edge. The TSB referencing connector C1064 specifically applies to this generation and its platform mates.

Symptoms You May Notice

• This is not a trouble code and has no symptoms. However, if you have a related P-code due to a wiring issue at connector C1064, you may experience:
• Check Engine Light illumination.
• Inaccurate or erratic engine temperature gauge (may read excessively high or low).
• Reduced engine performance or rough running.
• Cooling fans running constantly or not at all.
• Poor fuel economy.
• Difficult starting the engine, especially when cold.
• Thick white smoke from the exhaust if coolant has leaked into a cylinder, which can be a related but more severe issue.

Most Likely Causes

1. Misinterpretation of Service Information 🔴 High Probability The term 'C1064' is used in official Ford TSBs as a connector name, which can easily be mistaken for a C-series (Chassis) trouble code.
   How to confirm: Scan the vehicle with an OBD-II scanner. Confirm that no 'C1064' code is present. Look for P-codes related to the ECT sensor (e.g., P0116, P0117, P0118, P0128). The OBD-II port is located under the steering wheel.
   Typical fix: Identify the actual trouble code stored in the Powertrain Control Module (PCM) and begin diagnosis based on that code.
   Est. part cost: $0
2. Damaged Wiring or Poor Connection at Connector C1064 🟡 Medium Probability TSB #SSM 47791 was issued specifically because the ECT sensor connector may not be fully seated or the wiring between C1064 and its mating connectors could be damaged.
   How to confirm: With an active ECT-related code (like P0117 or P0118), perform a visual inspection of the ECT sensor wiring harness and connector C1064. Check for loose connections, pushed-out pins, corrosion, or physical wire damage. Test for continuity with a multimeter between the ECT sensor, C1064, and the PCM.
   Typical fix: Repair the damaged section of the wire or replace the connector pigtail if the connector itself is damaged. Ensure the connector is fully seated and secured.
   Est. part cost: $10-$50

Rare But Worth Checking

• Faulty Engine Coolant Temperature (ECT) Sensor:

Diagnosis Steps

1. Confirm the actual Diagnostic Trouble Code (DTC) using a reliable OBD-II scanner. Do not proceed if you have not pulled a code from the vehicle's computer.
2. If you have an ECT-related code (like P0117, P0118, P0128), consult the vehicle's wiring diagram to understand the circuit.
3. Locate connector C1064 and its mating connector (C1016 or C1168 as per TSB #SSM 47791). The ECT sensor is often located on a coolant passage on the cylinder head.
🎬 Watch: 2.0L EcoBoost coolant temperature sensor replacement walkthrough
4. Inspect the connectors for corrosion, pushed-out pins, water intrusion, or physical damage. Ensure it is fully seated.
5. Check for wiring continuity between the ECT sensor, connector C1064, and the Powertrain Control Module (PCM). A multimeter can be used to check for opens or shorts in the wiring.
6. If wiring and connectors are intact, diagnose the ECT sensor itself as per the procedure for the specific P-code you found. 🎬 See how to test and replace the ECT sensor This may involve checking the sensor's resistance as it heats up.
7. If no wiring or sensor faults are found, check for other cooling system issues like air pockets or low coolant levels that could trigger an ECT code.

Parts You'll Likely Need

• Wiring Connector Pigtail (OEM #WPT-1469) — If the connector itself or the wires immediately attached to it are damaged, replacing the pigtail is the standard repair. 🎬 Watch: How to repair a damaged sensor connector This is more likely than replacing an entire harness.
  Trusted brands: Motorcraft, Standard Motor Products, Dorman
  OEM price range: $35-$50
  Aftermarket price range: $10-$30
• Engine Coolant Temperature (ECT) Sensor — While the TSB warns against replacing the sensor if wiring is the issue, the sensor itself can still be the root cause of an ECT-related P-code.
  Trusted brands: Motorcraft, Bosch, Delphi
  OEM price range: $30-$60
  Aftermarket price range: $15-$40

Related Codes That Often Appear With This One

• P0117 — Indicates Engine Coolant Temperature (ECT) Sensor Circuit Low, a likely result of a bad connection or damaged wire at connector C1064.
• P0118 — Indicates Engine Coolant Temperature (ECT) Sensor Circuit High, another possible result of a wiring fault related to connector C1064.
• P0128 — Indicates Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature), which can be triggered by faulty sensor readings caused by wiring issues.
• P130D — This manufacturer-specific code is also mentioned in TSB #SSM 47791 as being related to ECT sensor connector issues.

Technical Service Bulletins (TSBs) & Recalls

• SSM 47791: Warns that ECT sensor codes (P0116, P0117, P0118, P0119, P0217, P0330, P1026, P130D) may be caused by a connector (C1064) or wiring issue, and that the sensor itself should not be replaced if damaged wiring is found. It applies to Edge, MKX, Nautilus, Fusion, and Continental models.

Platform-Specific Known Issues

• Ford issued Technical Service Bulletin #SSM 47791 for 2015-2019 Ford Edge models (among others) due to potential issues with the ECT sensor connector (C1064) not being fully seated or having damaged wiring between it and connectors C1016/C1168, leading to various P-codes.
• For the 2.7L EcoBoost engine specifically, other TSBs like SSM 48991 also point to ECT sensor circuit issues, sometimes integrated with the knock sensor harness, as a cause for code P0117.

Mechanic-Grade Diagnostic Values

• ECT Sensor Resistance vs. Temperature — expected: Resistance is inversely proportional to temperature. Approx. 37,000 Ω at 50°F (10°C), 9,500 Ω at 104°F (40°C), 2,000-3,000 Ω at 68°F (20°C), and 200-300 Ω at 194°F (90°C).. Failure: A reading near zero ohms indicates a shorted sensor (P0117). An open circuit (infinite resistance) indicates an internal failure (P0118).
• ECT Sensor Signal Voltage (back-probed at connector C1064) — expected: Between 0.5V and 4.5V with key on, engine off. Voltage should decrease as the engine warms up.. Failure: A reading below ~0.2V indicates a short to ground (P0117). A reading near 5.0V indicates an open circuit (P0118).
• Scan Tool Live Data (ECT PID) — expected: With a cold engine, the ECT reading should be very close to the Ambient Air Temperature (AAT) and Intake Air Temperature (IAT) readings.. Failure: A reading of -40°F/°C indicates an open circuit (P0118). A reading of 280°F+ (140°C+) on a cold engine indicates a short circuit (P0117).

Scan Tool Commands That Help

• Ford IDS (Integrated Diagnostic System): Reset KAM (Keep Alive Memory) — After replacing the ECT sensor or repairing the wiring, this function clears the PCM's learned adaptive values, forcing it to re-learn based on the correct sensor input.
• Ford IDS (Integrated Diagnostic System): Data Logger — To monitor and graph the live ECT sensor voltage or temperature PID to check for intermittent drops or spikes that would indicate a wiring issue, which is the primary suspect for this vehicle.
• Ford IDS (Integrated Diagnostic System): Power Balance Test — If a P0117 code is present (false high temp), this test can confirm if the PCM is taking protective action, such as disabling fuel injectors, which helps verify the PCM is reacting to the bad signal.

Wiring & Ground Locations

• C1064 — This is the identifier for the ECT sensor connector itself.. This is the primary connector mentioned in TSBs that may be improperly seated or have damaged wiring causing ECT-related codes.
• ECT Sensor (2.0L EcoBoost) — On the coolant outlet housing on the back (firewall side) of the engine. Requires removal of the air cleaner outlet duct for access.. Knowing the physical location is required for inspection and testing of the sensor and connector C1064.
• ECT Sensor (2.7L / 3.5L V6) — Underneath the intake manifold, in the valley between the cylinder banks. This is a very difficult location to access and requires significant disassembly.. The difficult location increases labor time significantly and makes a simple wiring check a major job. This is critical information for estimating repair cost and difficulty.
• G104 / G106 — Main engine compartment ground points. G104 is often on the left front of the engine compartment, while G106 is on the right front. Other grounds are located on the front bumper support.. A poor ground connection for the sensor return circuit can cause incorrect voltage readings, leading to P0117 or P0118 codes. Checking main engine grounds is a key step in diagnosing any sensor circuit fault.

Real Owner Repair Stories

• Go-Parts.com / F-150 Forum discussion (2018 Ford F-150 with 2.7L EcoBoost (same engine family and sensor location as Edge)) — Check Engine Light with P0119 (ECT Intermittent).
  ❌ Tried (didn't work) Initial diagnosis pointed to the ECT sensor.
  ✅ What actually fixed it The ECT sensor is buried under the intake manifold, leading to a $1,500 dealer repair bill. The official fix, per a TSB for the F-150 (21-2168), involves installing a new, relocated sensor on an external coolant line, making future replacement much easier. This suggests a known design issue with the sensor's location.
• Ford Edge Forum user (2016 Ford Edge) — 'Engine Coolant Over Temperature' warning message on the dash.
  ❌ Tried (didn't work) Initial diagnosis was uncertain due to lack of local parts support in owner's region (Angola).
  ✅ What actually fixed it The owner imported a new ECT sensor and replaced it, which resolved the overheating warning. This serves as a real-world confirmation that despite the TSB's focus on wiring, the sensor itself can and does fail.

OEM Part Supersession History

• GU2Z-14S411-KA → WPT-1469 — WPT-1469 is the widely recognized Motorcraft service part number for the pigtail connector kit that corresponds to the OEM engineering number.
  Heads up: While WPT-1469 is the correct pigtail, ensure the wire gauge (approx. 20 AWG) and splicing technique (using adhesive-lined heat shrink tubing) meet Ford's specifications for a durable repair.
• 7M5Z-12A648-A (Motorcraft DY-1187) → DY1145 (for some applications) — Part numbers for sensors can vary based on engine and model year. TSBs for the 2.7L engine reference part number 12A648.
  Heads up: It is critical to verify the correct ECT sensor part number using the vehicle's VIN. Using the wrong sensor, even if it fits, can result in incorrect temperature readings.

Model Year Variations Within This Range

• 2019: The 2019 model year marked a significant mid-cycle refresh for the Edge, introducing a new 8-speed automatic transmission and revised styling. While the core 2.0L and 2.7L engines remained, wiring and module locations could differ slightly from pre-refresh (2015-2018) models.
• 2015-2019 (2.0L EcoBoost): A known design flaw in some 2.0L EcoBoost engines of this era is coolant intrusion into the cylinders. An overheating warning caused by a faulty ECT sensor (related to C1064) could cause an owner to mistakenly fear this much more severe engine failure. It's important to differentiate the symptoms of a sensor fault (erratic gauge, instant high temp warning) from actual overheating.