AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

P0184 indicates an intermittent or erratic signal from the fuel temperature sensor 'A' circuit, requiring diagnosis of wiring, connectors, sensor function, and PCM interpretation.

Common Symptoms

Check Engine Light (CEL) illuminated
Intermittent rough idle or hesitation
Reduced fuel efficiency
Occasional stalling or transient loss of power
Erratic or fluctuating fuel temperature readings

Most Common Causes

Faulty fuel temperature sensor 'A' high

Sensor itself fails to provide consistent resistance/voltage signal.

Intermittent or damaged wiring/connectors high

Loose pins, corrosion, frayed wires in sensor harness cause intermittent signal.

Corroded/poor electrical connections at sensor medium

Poor contact introduces erratic signals even if wiring appears intact.

PCM internal fault or calibration issue low

Rare; consider only after sensor and wiring verified good.

Diagnostic Steps

Use an OBD‑II scanner to confirm P0184 and check for additional codes.

Expected: Code P0184 present; note freeze frame data.

Interpretation: Confirms intermittent signal fault and provides context.
Visually inspect the fuel temperature sensor and its connector for corrosion, damage, or loose pins.

Expected: Clean, undamaged connector with secure fit.

Interpretation: Damaged or corroded connectors often cause intermittent signals.
Test wiring continuity and resistance between sensor and PCM with multimeter.

Expected: Stable continuity and expected resistance values.

Interpretation: Open/short or fluctuating readings suggest wiring issues.
Measure live sensor voltage during engine operation.

Expected: Voltage smoothly rises with fuel temperature without sudden drops.

Interpretation: Erratic voltage confirms sensor or circuit malfunction.
If sensor and wiring test OK, investigate PCM inputs and calibration per OEM procedures.

Expected: Correct sensor data processing by PCM.

Interpretation: PCM faults are rare; proceed only after other checks.

Repair Solutions

Replace fuel temperature sensor 'A' medium

Estimated Cost: $50 - $300

Typical solution when sensor fails resistance/voltage tests.

Repair or replace damaged wiring/connectors medium

Estimated Cost: $20 - $200

Cost varies with access and extent of wiring damage.

Clean and secure electrical connections easy

Estimated Cost: $0 - $50

Use dielectric grease to prevent future corrosion.

PCM reprogramming or replacement hard

Estimated Cost: $200 - $800

Consider only if all other components verified good.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Replacing only the sensor without inspecting wiring/connectors
Attributing rough idle or performance issues solely to fuel delivery rather than sensor circuit

Frequently Asked Questions

Technical definition of P0184 OBD-II Code

Technically, the P0184 code represents Fuel Temperature Sensor 'A' Circuit Intermittent. It usually points to a fault within the Fuel System.

Should I stop driving if I have P0184?

With a severity level of medium, may cause reduced fuel economy, erratic performance, or rough idle but vehicle often remains drivable; long‑term neglect can worsen drivability.

How do I know if I have code P0184?

Drivers often report: Check Engine Light (CEL) illuminated, Intermittent rough idle or hesitation, Reduced fuel efficiency when this code is present.

What causes the P0184 code?

This code is frequently triggered by: Faulty fuel temperature sensor 'A', Intermittent or damaged wiring/connectors, Corroded/poor electrical connections at sensor.

Is P0184 expensive to fix?

Expect to pay around $50 if the issue is a Clean and secure electrical connections, but up to $800 if the PCM reprogramming or replacement needs replacement.

Is P0184 a generic or manufacturer-specific code?

This is a universal code. You might see P0184 on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

P0184: Fuel Temperature Sensor 'A' Circuit Intermittent