What Does P1200 Mean?
The ECM has detected an electrical problem with the fuel pump relay circuit or communication. This can affect fuel delivery and engine operation.
Safety Warning
Vehicle may stall unexpectedly or fail to start. Do not drive until repaired.
Common Causes
40%
Faulty fuel pump relay
25%
Damaged wiring or poor connections in fuel pump relay circuit
20%
ECM internal relay driver circuit failure
15%
Blown fuse in fuel pump circuit
Diagnostic Steps
1
Step 1: Locate and inspect fuel pump relay and socket for damage or corrosion
2
Step 2: Check fuses related to fuel pump circuit
3
Step 3: Test fuel pump relay operation by swapping with known good relay of same type
4
Step 4: Measure voltage at relay coil terminals when key is turned on
5
Step 5: Check continuity between ECM and relay socket using wiring diagram
Estimated Repair Cost
$50 - $350
Parts + labor, varies by vehicle and location
The ECM has detected an electrical problem with the fuel pump relay circuit or communication. This can affect fuel delivery and engine operation.
The most common cause of P1200 (Fuel Pump Relay/ECU Circuit Malfunction) is: Faulty fuel pump relay
Typical repair costs for P1200 range from $50 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may stall unexpectedly or fail to start. Do not drive until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1200 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Manufacturer
Recommended Tools
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