P1339 Fault Code

Jaguar – FUEL PUMP (FP) 2 – CIRCUIT MALFUNCTION

For Jaguar, fault code P1339 is logged when the powertrain control module (PCM) has detected a circuit malfunction for the second fuel pump.

The fuel pump is responsible for pressurizing fuel in the fuel tank and sending it to the fuel injection system. This is a necessary step in both transporting fuel and helping pressurize it to increase the efficiency of the fuel injectors.

While it is not a common occurrence, some Jaguars have a dual fuel pump system. This is typically reserved for older models that have a twin-fuel tank system.

Models like the XJ Series most commonly had this system.

What this means is that only a very select number of Jaguar vehicles will be able to log fault code P1339.

Despite the fault code indicating there is a circuit malfunction, it is also very possible that a faulty secondary fuel pump can cause this. The potential issues within the circuit can include a short or open circuit.

This can result in low fuel pressure, which can cause the engine to run lean and perform poorly. These changes in driveability can range in severity depending on how serious the issue is.

In some cases, the vehicle will be unable to start as little to no fuel reaches the cylinders.

See generic codes: P0230, P0231, P0232

Audi – CRANKSHAFT POSITION/ENGINE SPEED SENSOR CROSS CONNECTED

For Audi, fault code P1339 is logged when the powertrain control module (PCM) has detected an issue with the crankshaft position (CKP) sensor and the engine speed sensor circuits.

This happens when the PCM has detected that the connectors for these two sensors have been connected incorrectly in the wiring harness.

This fault code indicates that the vehicle has likely undergone maintenance that involved the wiring harness, resulting in the wires becoming incorrectly crossed in the process of whatever repairs were conducted.

This may seem like an unlikely occurrence, but wiring harnesses can be extremely complicated in modern vehicles and mistakes can and do happen. This is especially true when performing DIY repairs or taking a vehicle to a mechanic that does not specialize in these vehicles.

The fix for this issue is to simply switch the improperly connected sensor connectors and place them in their correct positions. However, this can be a lengthy process.

Despite being a fairly trivial problem, this code can result in multiple fault codes related to these sensors. Additionally, the vehicle will most likely be unable to start until the code is fixed.

This makes P1339 a serious fault code that needs to be addressed immediately.

See generic codes: There is no generic fault code for this issue.

Mini – CRANKSHAFT POSITION/ENGINE SPEED SENSOR CROSS CONNECTED

Fault code P1339 represents the same issue for Audi, Volkswagen, and Mini. See the above description for Audi for more information on this issue and additional fault codes that can help with the issue.

See generic codes: There is no generic fault code for this issue.