What Does P1418 Mean?
The fuel level sensor circuit is reporting an abnormally high voltage signal. This typically indicates a wiring issue, sensor malfunction, or an open circuit in the fuel level sending unit.
Common Causes
40%
Failed fuel level sending unit or float assembly
30%
Open circuit or broken wiring to fuel level sensor
20%
Corroded or loose fuel pump module connector
7%
Damaged fuel tank causing float to stick in full position
3%
Instrument cluster or BCM internal fault
Diagnostic Steps
1
Step 1: Monitor fuel level sensor voltage with scan tool at various fuel levels (should vary from ~0.5V empty to ~4.5V full)
2
Step 2: Access fuel pump module connector and inspect for corrosion or damage
3
Step 3: Test resistance across fuel level sender terminals (should change with float movement, typically 10-180 ohms)
4
Step 4: Check wiring continuity from fuel tank to instrument cluster or BCM
5
Step 5: If voltage stays high with sensor disconnected, check for short to voltage in wiring; if normal when disconnected, replace sender unit
Estimated Repair Cost
$200 - $600
Parts + labor, varies by vehicle and location
The fuel level sensor circuit is reporting an abnormally high voltage signal. This typically indicates a wiring issue, sensor malfunction, or an open circuit in the fuel level sending unit.
The most common cause of P1418 (Fuel Level Sensor Circ Signal too High) is: Failed fuel level sending unit or float assembly
Typical repair costs for P1418 range from $200 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but fuel gauge will read inaccurately (typically full). Driver must track fuel manually to avoid running out of gas.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1418 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Fuel System - Level Monitoring
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
