U0120 FORD - Lost Communication With Starter/Generator Control Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
Comments  |  Add Comment

U0120 FORD Possible Causes

  • Faulty Starter Motor
  • Faulty Generator/Alternator
  • Starter Motor harness is open or shorted
  • Starter Motor circuit poor electrical connection
  • Generator/Alternator harness is open or shorted
  • Generator/Alternator circuit poor electrical connection

First diagnose U0120 FORD code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the U0120 FORD code

    Labor: 1.0

    The cost of diagnosing the U0120 FORD code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

U0120 FORD Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

U0120 Ford Description

The alternator is controlled by the Power Control Module PCM) which monitors certain parameters such as the engine temperature, battery temperature and electrical demand. If the alternator does not receive a signal from the PCM, the battery light is illuminated on the vehicle. This can sometimes be misdiagnosed as an alternator failure. There are some checks that can be made to see if the alternator is at fault or, if there is an issue with the PCM or its wiring.

- The first thing to check is if the battery is the correct type. Smart charge systems are designed to be used only with a silver calcium battery not the lead acid type due to the voltages used which may damage a lead acid battery and give incorrect readings.

- If you disconnect the 3 pin PCM plug from the alternator and it is charging again, this will show the alternator is being controlled by the PCM. This will check if the alternator is still functioning. The 3 pin plug will need to be reconnected immediately after the test to avoid any damage to the vehicle. This test is a temporary check only and is not a resolution to the fault. Disconnection and reconnection of the 3 pin plug should be done when the engine is switched off.

If the battery is of the correct type and the alternator is found to be charging, the next part to check is the continuity of the wiring loom from the alternator to the PCM. Due to the location of the alternator in relation to the PCM, the wiring can become chafed or the insulation melts from being too close to a heat source. This is a common reason when the battery light is illuminated and a new loom will be needed.

OBDII Code U0120 Ford - Lost Communication With Starter/Generator Control Module - AutoCodes.com

U0120 FORD More Information

Need more information on how to fix the U0120 FORD code?
Get Access to Factory Service Manuals

Need more help?

Get the U0120 Ford code diagnosed by a professional: Find a repair shop in your area

Related Information

U0120 FORD Comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the U0120 Ford code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧