How to Solve Caterpillar Loader Machine Trouble Code 1239-1

Caterpillar Load machine trouble code 1239-1 problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.


Diagnostic trouble code 1239-1 is occurring on the machines listed above.This code indicates the “Fuel Rail Pressure ls Low” even though there is no leakage in the machine.



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Machine effect:

Compact Track Loader299D2(S/N: FD21-UP; BY41-UP)

299D2 XHP(S/N: DX21-UP;DX91-UP)


Multi Terrain Loader

297D2(S/N: BL71-UP)

297D2 XHP(S/N: HP21-UP)


Skid Steer Loader

272D2(S/N: BL21-UP)

272D2 XHP (S/N:MD21-UP)



(A) Rail pressure sensor

(B) Pressure discharge valve

(C) Pre-stroke control valve (PCV)

How to Solve Caterpillar Loader Machine Trouble Code 1239-1

1Check for lack of fuel to the engine


If code only occurs when fuel tank is low then that is the likely cause.

The maximum slope to travel across is18.4 Degrees. lf traveling across such a slope and the fuel tank is less than a quarter of tank, the fuel tank pickup tube will be above the fuel level.


The fuel tank cap does not vent. Remove the fuel tank cap, if air vents when the fuel cap is removed then replace the fuel cap. Look on the inside of the fuel cap, if the orange diaphragm is missing then replace the cap.


Filters could be clogged. Document the hours on the fuel filter and visually check the lift pump screen for being clogged Replace the fuel filter and lift pump filter


Check that the lift pump creates approximately 83 kPa (12 psi) of pressure when dead headed


Check that the lift pump flow is approximately ~0.5 gpm with the free flow.


2Check that the wires for the rail pressure sensor (A), pressure discharge valve (B), and pre-stroke control valve (PCV) (C) are not bent excessively or pulled tight at the connector.


More repair case for Caterpillar machine,please refer to:Caterpillar Machine Repair

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