What Does P1500 Mean?
The ECU has detected an electrical fault in the fuel pump relay control circuit. The relay may not be receiving proper voltage, ground, or control signal from the ECU.
Safety Warning
Vehicle may not start or could stall without warning during operation, creating potential safety hazard. Do not drive if fuel pump is intermittent.
Common Causes
35%
Failed fuel pump relay with burnt or stuck contacts
25%
Blown fuse in fuel pump relay circuit or main power supply
20%
Damaged wiring or poor connections in relay control circuit
12%
Faulty ECU relay driver circuit or internal failure
8%
Corroded or loose relay socket terminals causing high resistance
Diagnostic Steps
1
Step 1: Locate fuel pump relay in fuse/relay box and test relay operation by swapping with identical relay
2
Step 2: Check all fuses related to fuel pump circuit for continuity and proper amperage rating
3
Step 3: Test for battery voltage at relay power supply terminal and proper ground at relay coil
4
Step 4: Verify ECU is providing ground signal to relay control circuit during key-on and cranking
5
Step 5: Inspect relay socket for corrosion, bent terminals, or overheating damage
Estimated Repair Cost
$50 - $300
Parts + labor, varies by vehicle and location
The ECU has detected an electrical fault in the fuel pump relay control circuit. The relay may not be receiving proper voltage, ground, or control signal from the ECU.
The most common cause of P1500 (Fuel Pump Relay Electrical Circuit Malfunction) is: Failed fuel pump relay with burnt or stuck contacts
Typical repair costs for P1500 range from $50 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not start or could stall without warning during operation, creating potential safety hazard. Do not drive if fuel pump is intermittent.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1500 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Manufacturer
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