DTC P0182: Fuel Temperature Sensor ‘A’ Circuit Low Input

In the intricate realm of automotive diagnostics, diagnostic trouble codes (DTCs) serve as guiding lights, illuminating potential issues within a vehicle’s systems. Among these, DTC P0182 takes center stage as a significant indicator of problems related to the fuel temperature sensor ‘A’ circuit low input. This comprehensive article delves into the causes, symptoms, inspection procedures, and effective solutions for addressing and resolving DTC P0182.

1. Causes of DTC P0182:

DTC P0182 emerges when the Engine Control Module (ECM) detects a low input signal in the fuel temperature sensor ‘A’ circuit. The underlying causes can encompass:

– Faulty fuel temperature sensor: A malfunctioning or out-of-spec fuel temperature sensor can produce abnormally low readings.

– Wiring and connector problems: Damaged or corroded wiring and connectors within the sensor circuit can lead to signal issues.

– Open circuit: A break in the sensor circuit can result in a low input signal.

– Faulty ECM: An ECM malfunction can lead to inaccurate readings.

2. Symptoms of DTC P0182:

Recognizing the symptoms associated with DTC P0182 aids mechanics in accurately diagnosing the issue:

– Inaccurate fuel composition calculations: Incorrect fuel temperature readings can lead to improper fuel mixture calculations.

– Decreased fuel efficiency: Abnormally low sensor readings can lead to imbalanced air-fuel mixture and increased fuel consumption.

– Illuminated Check Engine Light (CEL): DTC P0182 triggers the CEL to alert the driver of a potential problem.

3. Inspection of DTC P0182:

Thorough inspection techniques are crucial for accurate diagnosis:

– OBD-II scan: Utilize an OBD-II scanner to retrieve the DTC and accompanying freeze frame data, providing insight into the conditions that activated the code.

– Visual examination: Inspect the fuel temperature sensor wiring and connectors for visible signs of damage or corrosion.

– Wiring integrity check: Inspect for breaks or damaged wiring that could cause a low input signal.

4. Resolving Causes of DTC P0182:

Addressing DTC P0182 involves specific steps tailored to the underlying issue:

– Fuel temperature sensor replacement: Replace a malfunctioning fuel temperature sensor with a new, high-quality unit that meets manufacturer specifications.

– Wiring and connector repair: Repair or replace damaged wiring and connectors to ensure proper signal transmission.

– Circuit continuity test: Verify continuity in the sensor circuit to ensure there are no open circuits.

– ECM diagnosis: If an ECM malfunction is suspected, diagnose and rectify the issue through reprogramming or replacement.

5. Clearing DTC P0182:

After successfully addressing the root cause, clear the DTC from the ECM’s memory using an OBD-II scanner. This step confirms the issue’s resolution and prevents the recurrence of the CEL.


DTC P0182, indicative of a fuel temperature sensor ‘A’ circuit low input, underscores the importance of accurate sensor readings for optimal engine performance. By understanding its causes, recognizing its symptoms, utilizing meticulous inspection techniques, and implementing effective solutions, mechanics can accurately diagnose and rectify this issue. Maintaining reliable sensor performance remains pivotal for achieving optimal fuel efficiency, engine performance, and overall vehicle functionality.