What does code P1243 mean?

Q: What does code P1243 mean?

Second Fuel Pump Faulty or Ground Fault. P1243 on Ford vehicles means the powertrain control module (PCM) has detected a fault in the second fuel pump circuit, which is the high-pressure or transfer pump that works alongside the primary pump on many Ford gasoline and diesel applications. The PCM monitors the pump's electrical circuit and flags this code when it sees an open circuit, a short to ground, or a current draw that does not match the commanded output. In plain terms, the computer knows the second fuel pump is not receiving the power or ground it expects, so it sets this code and may disable the pump to protect the circuit.

DTC codes / Ford codes / P1243

P1243 · FordSecond Fuel Pump Faulty or Ground Fault

P1243 on Ford vehicles means the powertrain control module (PCM) has detected a fault in the second fuel pump circuit, which is the high-pressure or transfer pump that works alongside the primary pump on many Ford gasoline and diesel applications. The PCM monitors the pump's electrical circuit and flags this code when it sees an open circuit, a short to ground, or a current draw that does not match the commanded output. In plain terms, the computer knows the second fuel pump is not receiving the power or ground it expects, so it sets this code and may disable the pump to protect the circuit.

SystemPowertrain

Code typeFord specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.