P0182 — fuel temperature sensor A low circuit input

P0182 indicates a low electrical input in fuel temperature sensor A circuitry, not proof that the fuel itself is cold. The input may come from a discrete NTC or a sensor integrated with another unit; low voltage on some NTC circuits can correspond to implausibly high displayed temperature. GM PIP5198A identifies P0182 and harness chafing only for specified 2015 LML trucks. Use the vehicle circuit and sensor characteristic; never open a pressurized fuel system for an electrical test.

Affected system: Fuel temperature sensing

Symptoms

• MIL and an implausible, frozen or substituted fuel-temperature reading.
• Starting or fueling behavior may change on some systems, but symptoms may be absent.

Possible causes

• Signal short to ground or leakage through corrosion/insulation in positively biased circuits.
• Defective NTC element or connector contamination; in integrated modules the fault may reside in the assembly.
• Feed, ground, reference or harness defect according to actual topology.

What to check

• 1. Save P0182, associated codes, freeze-frame and fuel-temperature PID. With P0183/P0184 or reference DTCs, check shared circuitry first.
• 2. Identify sensor A and location from OEM data. If temperature comes from a combination sensor, do not expect a separate probe.
• 3. After adequate thermal soak, compare fuel temperature with available temperature references while accounting for location. An impossible, fixed hot reading suggests signal interpretation rather than actual fuel overheating.
• 4. With the engine off and isolated per OEM instructions, inspect plugs and wiring for corrosion, abrasion, bad routing and loose pins; repair confirmed physical damage first.
• 5. Check feed, ground and signal at OEM-approved points; low ECM input with a normal sensor-end signal implicates the connecting harness.
• 6. Where service data permits sensor isolation/unplugging, compare live-data change to the specified response; normal input response shifts suspicion to the sensor, no response to wiring/controller.
• 7. Only when de-energized, compare NTC resistance with the correct sensor's temperature curve. A short or reading inconsistent with known temperature can prove failure; no universal resistance threshold applies.
• 8. GM PIP5198A applies only to specified 2015 Silverado/Sierra 6.6L LML: EGR-area harness chafing is an OEM lead; dangerous injector high-voltage wires share that harness and require GM procedures.

Also written as: P0182-00, P018200, PO182 (some scan tools add the fault-type byte, e.g. -00).