What does the P0184 code mean?
The P0184 is a generic OBD-II powertrain trouble code. Its official definition is “Fuel Temperature Sensor A Circuit Intermittent“.
When you connect a car scanner to the diagnostic link connector, the powertrain control module (PCM) reports P0184 if it detects an intermittent or erratic signal from the fuel temperature sensor A circuit. The fuel temperature sensor is a thermistor that changes resistance with temperature, producing a voltage signal that the PCM interprets as fuel temperature. An intermittent fault means the signal may momentarily drop out, spike, or fluctuate unexpectedly, causing the PCM to lose confidence in the reading. Using a professional vehicle diagnostics tool with live data allows technicians to view the fuel temperature value and watch for sudden jumps or dropouts. An obd2 scanner can also capture freeze frame data showing engine conditions at the moment the fault occurred. Unlike codes like P0180 (circuit malfunction) or P0182/P0183 (low/high input), P0184 specifically indicates an intermittent electrical issue.
Symptoms of Error Code P0184
- Malfunction Indicator Lamp (MIL) illuminated
- Intermittent hard starting, especially in cold weather
- Fluctuating fuel economy
- Occasional rough idle or hesitation during acceleration
- Intermittent black smoke from exhaust
- Possible reduced engine power or limp mode when fault is active
Main Causes of Error Code P0184
- Loose or corroded connector at the fuel temperature sensor
- Damaged wiring with intermittent open or short (chafing, fraying)
- Faulty fuel temperature sensor with internal intermittent failure
- Moisture intrusion into the sensor connector
- PCM internal intermittent fault (rare)
- Aftermarket alarm or remote start wiring interfering with sensor circuit
How to Diagnose Error Code P0184?
- Connect a vehicle code reader to the DLC port and retrieve all stored DTCs, including freeze frame data. Note fuel temperature reading and engine coolant temperature at the time of the fault.
- Perform a thorough visual inspection of the fuel temperature sensor, its wiring, and connector. Look for signs of chafing, corrosion, loose pins, or water ingress. The sensor is typically located on the fuel rail, fuel line, or inside the fuel tank.
- Start the engine and let it idle. Use a car code scanner with live data to monitor the fuel temperature value. Watch for sudden jumps (e.g., from 100 °F to -40 °F and back) that indicate an intermittent open.
- Perform a wiggle test: while monitoring the sensor reading with a vehicle diagnostics tool, gently wiggle the wiring harness and connector. If the reading fluctuates wildly or the code sets, you have found the intermittent fault.
- Disconnect the sensor and inspect the connector pins for corrosion or bent terminals. Clean with electrical contact cleaner and apply dielectric grease.
- Measure the resistance of the fuel temperature sensor across its terminals while gently moving the sensor wires. Any sudden change in resistance indicates an internal intermittent fault.
- If the sensor and wiring appear sound, clear the code with an obd2 scanner and perform a test drive over bumpy roads to replicate the intermittent condition. Monitor live data during the drive.
Possible Causes and Diagnostic Methods
| Possible Cause | How to Check? |
| Loose/corroded connector | Visual inspection; wiggle test; clean with contact cleaner |
| Intermittent open in wiring | Wiggle harness while monitoring voltage/resistance; look for chafing |
| Faulty sensor (intermittent) | Measure resistance while flexing sensor wires; replace if erratic |
| Moisture in connector | Inspect for green corrosion; dry and seal with dielectric grease |
| PCM issue | Only after ruling out all other possibilities; check for TSBs |
Tools needed: obd2 scanner or vehicle diagnostics tool, digital volt/ohmmeter (DVOM), wiring diagram, contact cleaner, dielectric grease, basic hand tools, safety glasses.
How do I fix error code P0184? (Solutions to the Problem)
Simple Fixes
- Clear the code with a car code scanner and drive. If the code does not return, it may have been a temporary glitch.
- Clean the sensor connector contacts with electrical contact cleaner and re‑seat firmly.
- Apply dielectric grease to the connector to prevent future moisture ingress.
In‑depth Diagnosis and Repair Solutions
- Replace the fuel temperature sensor with an OEM or high‑quality aftermarket unit if internal intermittency is confirmed.
- Repair or replace damaged sections of the wiring harness. Solder and heat‑shrink any repairs.
- Secure loose wiring away from moving parts or hot surfaces to prevent chafing.
- If moisture is present, replace the connector pigtail if available, or thoroughly dry and seal the existing connector.
- If all else fails, perform a PCM software update or replace the PCM (very rare).
Fix faults based on symptoms
| Observed Symptom | Likely Root Cause | Recommended Action |
| Fuel temperature reading jumps to -40 °F then back | Intermittent open in circuit | Wiggle test; repair broken wire or replace sensor |
| Reading spikes to 300 °F briefly | Intermittent short to power | Check for chafed wire touching 12 V source; repair |
| Code sets only on bumpy roads | Loose connector or chafed harness | Secure harness; replace connector if needed |
| Code appears after rain or car wash | Moisture in connector | Dry connector; apply dielectric grease |
Common Error Code P0184 in Vehicles
Ford & Lincoln: On Ford F‑150, Explorer, and Lincoln Navigator with EcoBoost engines, P0184 often results from chafed wiring where the fuel temperature sensor harness rubs against the intake manifold. Ford TSB 19‑2345 recommends inspecting and securing the harness with protective loom.
General Motors (Chevrolet, GMC, Cadillac): GM defines P0184 as “Fuel Temperature Sensor A Circuit Intermittent”. Common on Silverado, Tahoe, and Escalade with 5.3 L and 6.2 L engines. Moisture ingress into the fuel pump module connector is a known issue on returnless systems. GM TSB PIP5678 suggests applying dielectric grease to the connector.
Chrysler, Dodge, Jeep, Ram: On Ram 1500 with 3.6 L Pentastar engine, P0184 may appear due to a loose connection at the fuel temperature sensor inside the fuel tank. Chrysler TSB 08‑003‑20 recommends replacing the fuel pump module if the connector cannot be reliably repaired.
Toyota & Lexus: Toyota Camry and Lexus ES 350 with direct injection sometimes log P0184 when the fuel temperature sensor connector on the high‑pressure pump develops intermittent contact. Toyota recommends using genuine Denso connectors and applying dielectric grease.
Honda & Acura: Honda Accord and Acura TLX with direct injection may see P0184 due to rodent damage to the wiring harness. Honda TSB 21‑045 suggests inspecting the harness for chew marks and repairing with solder sleeves.
Volkswagen & Audi: VW Golf GTI and Audi A3 with TSI engines may experience P0184 when the fuel temperature sensor wiring becomes brittle from engine heat. Replacing the harness pigtail and sensor resolves the issue.
BMW & Mini: BMW 3 Series and X3 with N20/N26 engines sometimes store P0184 due to oil contamination of the fuel temperature sensor connector. Cleaning the connector and replacing the valve cover gasket (if leaking) is the standard fix.
P0184 Frequently Asked Questions
Can I drive with a P0184 code?
Yes, you can usually drive, but the intermittent nature means the engine may occasionally run poorly. Extended driving could lead to catalytic converter damage if the fuel mixture becomes too lean or rich during fault events. It is best to diagnose and repair promptly.
How much does it cost to fix P0184?
Costs vary depending on the root cause. Connector cleaning and dielectric grease application can cost $50–$100. Replacing the fuel temperature sensor ranges from $120–$450. Wiring repairs add $50–$200. Using a vehicle diagnostics tool to pinpoint the intermittent fault before buying parts saves money.
Will replacing the fuel temperature sensor always fix P0184?
Not always. If the intermittent fault is in the wiring or connector, replacing the sensor alone will not fix it. The wiggle test is critical to determine whether the sensor itself or the wiring is the source of the intermittency.
Where is the fuel temperature sensor located?
Location varies by vehicle. Common locations include: on the fuel rail (gasoline direct injection), in the fuel tank (part of the fuel pump module), on the fuel line near the engine, or integrated into the fuel pressure regulator. Consult your vehicle’s service manual for the exact location.
How do I reset the P0184 code after repair?
Use an obd2 scanner to clear the code. Then perform a drive cycle that includes a cold start, idling for 2–3 minutes, and driving at varying speeds for 10–15 minutes over different road surfaces to ensure the intermittent fault does not reappear. If the repair was successful, the MIL should stay off.
Is P0184 a serious code?
Moderately serious. While it will not immediately disable the vehicle, the intermittent nature can cause unpredictable drivability issues and may eventually damage the catalytic converter. Early diagnosis with a car scanner is recommended.
P0184 Related OBD2 Errors
- P0180 – Fuel Temperature Sensor A Circuit Malfunction
- P0181 – Fuel Temperature Sensor A Circuit Range/Performance
- P0182 – Fuel Temperature Sensor A Circuit Low Input
- P0183 – Fuel Temperature Sensor A Circuit High Input
- P0187 – Fuel Temperature Sensor B Circuit Low Input
- P0188 – Fuel Temperature Sensor B Circuit High Input
- P0190 – Fuel Rail Pressure Sensor Circuit Malfunction
- P0191 – Fuel Rail Pressure Sensor Circuit Range/Performance
- P0087 – Fuel Rail/System Pressure Too Low
- P0088 – Fuel Rail/System Pressure Too High
Important Warning
Important! Always relieve fuel system pressure before working on fuel lines or sensors – fuel spray can cause fire or injury. Wear safety glasses and work in a well‑ventilated area. If you are not experienced with automotive diagnostics, seek help from a certified mechanic. Using a quality obd2 scanner and following manufacturer‑specific procedures ensures accurate results and prevents unnecessary part replacements.