Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-P048000

Condition




The engine control module (ECM) sends a signal (speed request to the cooling fan) to the cooling fan module. The cooling fan module then regulates voltage to the fan motor at an infinitely variable rate. The diagnostic trouble code is generated if the engine control module (ECM) detects that fan speed is low.
The diagnostic trouble code can be diagnosed when the engine is running.

Note! The electric cooling fan may have a post-running time of up to approx. 6 minutes after the engine has been shut off. The time for the electric cooling fan's post-running depends on the engine's temperature, temperature in the engine compartment as well as the pressure level in the AC system.

Substitute value
- Nothing.

Possible source
- Internal fault in the electric cooling fan.
- Short-circuit to supply voltage in the signal cable.
- Damaged cooling fan module.

Fault symptom[s]
- Overheated engine.
- Electric cooling fan does not operate