Code
P2067
HUMMER
P — Powertrain
Fuel Level Sensor 2 Circuit Low Voltage
AI status
Completed
Completed
100%
Causes
- Short to ground on the fuel level sensor 2 signal or harness
- Open or corroded connector or poor pin contact
- Damaged wiring (chafing, broken conductor) between tank module and module/ECM/BCM
- Faulty fuel level sensor/module (fuel pump/fuel tank sender)
- Low reference voltage or poor ground at control module
- Faulty body/engine control module input circuitry
Symptoms
- Check Engine Light (MIL) illuminated
- Incorrect or erratic fuel gauge/fuel level display (typically reads empty or very low)
- Possible no-fuel-level information available to driver information systems
- Possible false low-fuel warnings or range calculation errors
What to check
- Read freeze frame and live data for fuel level sensor 1 and 2; compare values
- Check for additional related DTCs (fuel pump, BCM, or ground faults)
- Visually inspect connectors at the fuel pump module and any inline connectors for corrosion, water intrusion, or damage
- Measure battery/ignition reference voltage at the sensor connector with key ON, engine OFF
- Back-probe the signal wire and measure voltage and continuity to the module
- Wiggle test wiring while watching live data for intermittent changes
Signal parameters
- Reference voltage to sender: typically 5 V (verify vehicle-specific value)
- Expected sender signal: variable ~0.5–4.5 V depending on float position (vehicle-specific)
- Low-voltage fault threshold: signal near 0–0.3 V (varies by manufacturer)
- Typical sender resistance range: approx. 10–300 ohms across full travel (vehicle-specific)
Diagnostic algorithm
- Retrieve DTCs and live data with a scan tool. Note fuel level sensor 1 vs 2 readings and any related codes or pending faults.
- Verify battery voltage is stable (12.4–12.9 V with key off; ~13.5–14.7 V when engine running) to rule out low supply affecting sensors.
- Visually inspect external wiring and connectors to the fuel tank module. Look for corrosion, damaged insulation, or evidence of moisture intrusion. Repair or clean as needed.
- With key ON (engine OFF), back-probe the fuel level sensor 2 signal, reference, and ground terminals at the accessible connector. Confirm reference voltage present and check signal voltage. A signal near 0 V indicates a low-voltage condition.
- Check continuity of the signal wire to the controlling module (BCM/ECM). With connector disconnected, measure resistance to the module pin to identify opens or shorts to ground.
- Perform a wiggle test on the harness and connectors while monitoring the live signal for intermittent faults. Repair broken wires or poor terminals.
- If wiring and connectors check good, disconnect the in-tank pump/sender assembly and measure sender resistance across its terminals through full float travel (if serviceable) to confirm sender operation. Compare to OEM specification.
- If sender resistance or output is out of specification or the sender is shorted to ground, replace the fuel pump module / sender assembly following safe fuel-handling procedures (relieve fuel pressure, disconnect battery, ventilate area, avoid open flame/sparks).
- If sender checks good, suspect module input (BCM/ECM) damage. Perform module connector pin voltage and ground checks; consult wiring diagrams. Repair or replace control module only after excluding harness and sender.
- Clear codes, test-drive or cycle key to verify the fault does not return and that fuel level readings are restored.
Likely causes
- Corroded or bent pins at the in-tank fuel pump/sender connector or chassis harness connector
- Wire insulation rubbed through and shorting to chassis ground
- Failed fuel level sender inside the pump module pulling the circuit low
- Poor ground at the fuel tank or module mounting point
- Intermittent harness connection due to movement/vibration
Fault status
Status
PCM detected low voltage on Fuel Level Sensor 2 circuit (circuit pulled low or open).
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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