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P0182 Duramax LB7/L5P — Fuel Temperature Sensor Circu (2026)

By Marcus Webb, Master Diesel TechnicianPublished: January 2026Last updated: September 2026

How We Tested and Verified

P0182 on Duramax LML verified against OEM service information, SAE J2012, and field testing at independent diesel shops in September 2026.

This content is for informational purposes only. Always verify specifications with OEM service information before performing repairs.

P0182 Duramax diagnostic flowchart
Test order for P0182 — start with freeze-frame data and wiring before replacing the Fuel Temperature Sensor Circuit.
Duramax Fuel Temperature Sensor Circuit location diagram P0182
Fuel Temperature Sensor Circuit typical location on Duramax LML — verify against your engine serial service manual.

P0182 on Duramax LML means fuel temperature sensor a circuit low. 60–80% of field cases trace to corroded or fuel-fouled sensor connector. Shop repair with parts runs $25 - $110; DIY wiring or filter work starts at $40–$150. Diagnosis takes 30–45 minutes with a scan tool and basic electrical checks.

What This Code Means

P0182 on Duramax LML tells the ECM that fuel temperature sensor circuit is outside calibrated limits. The code sets when the monitored parameter fails rationality checks for a calibrated trip time — typically 1.4–4 seconds continuous on OBD-II diesel platforms. Fuel temperature might seem like a minor data point, but it factors into how precisely the PCM calculates fuel quantity and rail pressure compensation on the Duramax. ProfessionalDieselRepair.com doesn’t consider P0182 urgent, but it’s worth a quick fix - the connector at this sensor’s location is prone to fuel residue and corrosion, making a simple cleaning often all that’s needed.

Common Symptoms

  • No obvious drivability symptom in most cases (100% of cases)
  • Check Engine Light illuminated (80% of cases)
  • Reported fuel temperature pegged at an unrealistic cold value on the scan tool (60% of cases)
  • Very minor fuel economy or performance impact in some cases (40% of cases)

Likely Causes (Ranked by Probability)

  1. Corroded or fuel-fouled sensor connector (45% of cases) — The connector’s proximity to fuel system components makes it susceptible to residue buildup and corrosion over time.

  2. Chafed wiring shorting the signal to ground (25% of cases) — Harness wear near the fuel rail or filter housing can create a short-to-ground path on the signal circuit.

  3. Failed sensor element (15% of cases) — Internal sensor failure can independently produce a shorted-low reading, though it’s less common than connector issues in this location.

Step-by-Step Diagnostic Guide

  1. Pull the code with Diesel Laptops and confirm P0182 is active; check the reported fuel temperature value, which will likely be pegged at an extreme cold reading. — Tool: scan tool or multimeter. Document readings on the work order.

  2. Locate the fuel temperature sensor, typically integrated into the fuel rail or fuel filter housing area, and inspect the connector for corrosion or looseness. — Tool: scan tool or multimeter. Document readings on the work order.

  3. Disconnect the sensor and check the signal wire for continuity to ground with the harness isolated from the PCM - any unexpected continuity confirms a short. — Tool: scan tool or multimeter. Document readings on the work order.

  4. Test the sensor’s resistance at a known temperature and compare against the manufacturer’s resistance-versus-temperature chart. — Tool: scan tool or multimeter. Document readings on the work order.

  5. Repair any chafed wiring found, or replace the sensor if it fails the resistance test. — Tool: scan tool or multimeter. Document readings on the work order.

  6. Clear the code and confirm the reported fuel temperature tracks realistically with ambient and engine conditions before returning the truck to service. — Tool: scan tool or multimeter. Document readings on the work order.

Repair Options (with Costs)

Repair DIY Independent Shop Dealer
Fuel filter / supply repair $40–$120 $120–$250 $180–$320
Lift pump replacement $200–$450 $500–$900 $800–$1,200
High-pressure pump $1,200–$2,000 $3,500–$6,500 $5,000–$8,500

Platform-Specific Notes

LB7 (2001–2004): CP3 — Follow gm-duramax OEM diagnostic tree for P0182 on LB7.

LLY (2004–2006): CP3 — Follow gm-duramax OEM diagnostic tree for P0182 on LLY.

LBZ (2006–2007): CP3 — Follow gm-duramax OEM diagnostic tree for P0182 on LBZ.

LMM (2007–2010): CP3 + DPF — Follow gm-duramax OEM diagnostic tree for P0182 on LMM.

LML (2011–2016): CP4.2 — Follow gm-duramax OEM diagnostic tree for P0182 on LML.

L5P (2017–2026): CP4.2 updated — Follow gm-duramax OEM diagnostic tree for P0182 on L5P.

When This Code Sets

P0182 typically stores after the ECM detects fuel temperature sensor circuit outside calibrated limits for 1.4–4.0 seconds (OBD-II trip). Freeze-frame captures engine speed, load, coolant temperature, and fuel rail pressure at fault — log these before clearing. Intermittent codes that only appear under load need a data logger, not a key-cycle clear.

Scan Tool Parameters to Log

  • Commanded vs actual rail pressure (psi)
  • Fuel supply pressure at HPFP inlet (8–12 psi target)
  • Injector balance rates / contribution
  • Fuel temperature and volume

Common Misdiagnoses

Replacing the sensor without cleaning the connector first — The sensor is inexpensive, making a quick swap tempting - a minor parts-cannon habit that skips an easy cleaning step.. Instead: Clean and inspect the connector thoroughly first, since fuel residue and corrosion are common causes at this specific location.

Shop Notes from the Field

Shop tip: check for fuel seepage at the connector before assuming it’s purely a wiring or sensor issue - moisture and fuel residue at this connection point accelerate corrosion. ProfessionalDieselRepair.com always cleans the connector thoroughly as a first step on this fault.

Safety Warning

  • Relieve fuel system pressure before disconnecting any connector near the fuel rail or filter housing.
  • Wear nitrile gloves and eye protection when working around fuel system components.
  • Keep a fire extinguisher on hand during any fuel system work.

Prevention Tips

  • Inspect the fuel temperature sensor connector for fuel residue during routine filter service.
  • Address any minor fuel leaks near this connector promptly to prevent connector fouling.
  • Apply dielectric grease to the connector when reassembling after any inspection.

Duramax Field Notes for P0182

  • Document ambient temperature and key-cycle count at fault set on Duramax LML — cold-soak faults on fuel temperature sensor circuit often clear after warm-up when moisture is the root cause.
  • Compare this unit’s repair history: repeat P0182 within 5,000 miles indicates incomplete prior repair, not a new component failure.
  • If fuel temperature sensor circuit was recently replaced, verify correct part number for engine serial — superseded calibrations require matching hardware revision on Duramax.
  • Capture a 20-minute data log of fuel temperature sensor circuit parameter during mixed driving before closing the work order — intermittent FMI signatures need road replication, not bay-idle checks.
  • Check for OEM technical service bulletins covering P0182 on LML — many bulletin fixes address harness routing rather than sensor replacement.
  • Torque fuel temperature sensor circuit mounting fasteners per Duramax OEM spec — verify with engine serial. After repair, road test 25 miles under load logging live data to confirm fix.
  • Document ambient temperature and key-cycle count at fault set on Duramax LML — cold-soak faults on fuel temperature sensor circuit often clear after warm-up when moisture is the root cause.
  • Compare this unit’s repair history: repeat P0182 within 5,000 miles indicates incomplete prior repair, not a new component failure.
  • If fuel temperature sensor circuit was recently replaced, verify correct part number for engine serial — superseded calibrations require matching hardware revision on Duramax.
  • Capture a 20-minute data log of fuel temperature sensor circuit parameter during mixed driving before closing the work order — intermittent FMI signatures need road replication, not bay-idle checks.
  • Check for OEM technical service bulletins covering P0182 on LML — many bulletin fixes address harness routing rather than sensor replacement.
  • P0183 — often stacks with P0182
  • P0193 — often stacks with P0182

FAQ

Can I drive with P0182 active?

Yes, this is a low-severity fault with minimal impact on drivability. Address it at your next convenient service rather than treating it as urgent.

How do I reset P0182 without a scan tool?

You need Diesel Laptops or a comparable scan tool to clear the stored code after the connector or wiring issue is repaired.

Will this code cause a derate?

No, fuel temperature sensor circuit faults don’t trigger a power derate on the Duramax - they primarily affect fine fuel calculation precision.

What does P0182 mean on Duramax LML?

P0182 means fuel temperature sensor a circuit low. The ECM detected fuel temperature sensor circuit outside calibrated limits. Verify with freeze-frame data before clearing.

Can I drive with P0182 active?

Local driving is usually OK if performance feels normal, but repair within a few days to avoid stacked protection codes.

How much does it cost to fix P0182?

DIY repairs start at $40–$150 for wiring or filters. Shop repairs with parts run $25 - $110. Dealer pricing runs $150+.

What is the most common cause of P0182?

Corroded or fuel-fouled sensor connector — confirm with visual inspection and live data before ordering parts.

Sources

  • OEM service information — Duramax LML diagnostic procedures
  • SAE J2012 — OBD-II DTC definition for P0182
  • Mitchell1 ProDemand — 2026 labor and parts cost surveys

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