Code
P1410
PONTIAC
P — Powertrain
Fuel Tank Pressure System
Views:
UK: 28
EN: 52
RU: 36
AI status
Completed
Completed
100%
Causes
- Loose, missing, or damaged fuel filler cap
- Leak in EVAP/vapor lines or hoses
- Clogged or damaged charcoal canister
- Stuck or failed EVAP vent/purge solenoid (vent valve or purge valve)
- Faulty fuel tank pressure (FTP) sensor or sensor harness/connectors
- Wiring short or open between FTP sensor and PCM
Symptoms
- Malfunction Indicator Lamp (MIL/CEL) illuminated
- Failed emissions test or EVAP readiness monitor incomplete
- Fuel odor near vehicle or at fuel tank area (if large leak)
- Occasional difficulty completing drive cycle/EVAP tests
- Usually no noticeable engine performance loss (driveability often unaffected)
What to check
- Read freeze frame and live data with a scan tool; capture FTP sensor values during key-on and different driving conditions
- Visually inspect fuel cap for damage and confirm it tightens properly
- Inspect EVAP hoses, lines, and fittings for cracks, chafing, or disconnection
- Check connectors and wiring for corrosion, pin damage, or loose terminals at FTP sensor and PCM
- Operate/command purge and vent solenoids using a scan tool and verify they actuate
- Perform a smoke test or pressure/vacuum test on EVAP system to find leaks
Signal parameters
- FTP sensor output typically a 0–5 V signal; voltage should change smoothly with applied pressure/vacuum
- At key-on engine-off (sealed tank) FTP reading should approximate atmospheric reference — not stuck at a fixed extreme
- During commanded EVAP tests the FTP reading should respond (pressure rise or vacuum change) when vent or purge valves are actuated
- Open/short detection: check for expected sensor circuit resistance and no short to battery or ground
- Compare FTP sensor voltage/pressure values to manufacturer service data via scan tool live data
Diagnostic algorithm
- Retrieve freeze frame and live data; note FTP sensor values and related EVAP parameters.
- Perform a visual inspection: check gas cap, fuel tank area, EVAP hoses, canister, connectors, and wiring for obvious faults.
- Verify gas cap condition and torque (tighten or replace if suspect). Clear code and attempt a drive cycle to see if code returns.
- Command EVAP vent and purge solenoids with a scan tool; observe FTP sensor response. If solenoid does not operate, test/vet solenoid and its circuit.
- Backprobe FTP sensor and measure voltage/ground while observing live data. Wiggle harness to check for intermittent faults.
- Perform a smoke test of the EVAP system to locate leaks (hoses, fittings, tank seal, canister). Repair any leaks found.
- If no leaks and solenoids function, bench-test or replace FTP sensor and re-test. Check wiring continuity between sensor and PCM before replacing sensor.
- After repairs, clear codes and complete required drive cycle or use a scan tool to run EVAP monitor to confirm proper operation.
- If code persists despite correct sensor/wiring and no leaks, consider PCM diagnostics or consult technical service bulletins for manufacturer-specific procedures.
Likely causes
- Failed or drifting fuel tank pressure sensor reading out of range
- EVAP vent valve stuck open or closed preventing correct pressure tests
- Cracked or disconnected EVAP hose at tank or canister creating a leak
- Charcoal canister saturated/clogged causing incorrect tank pressure response
- Corroded connector or broken wire at the FTP sensor
- Loose or missing gas cap allowing system to vent
Fault status
Status
Fuel Tank Pressure System fault detected. The EVAP/fuel tank pressure sensor or related components are reporting an abnormal condition. Inspect EVAP hoses, gas cap, sensor electrical connections, and perform smoke/pressure testing as needed.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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