I threw this code today while i was at the carwash. The car was fine all day and then my Car beeps and a cell comes on. P0622....

nstrument Panel Cluster (IPC) Operation

Charge Indicator Operation
The instrument panel cluster (IPC) illuminates the charge indicator in the message center when the one or more of the following occurs:


The engine control module (ECM) detects that the generator output is less than 11 volts or greater than 16 volts . The IPC receives a serial data message from the ECM requesting illumination.
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts for more than 30 seconds. The IPC receives a serial data message from the body control module (BCM) indicating there is a system voltage range concern.
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
The ignition is ON, with the engine OFF.
Charging System Failure
The BCM and the ECM will send a serial data message to the IPC for the CHARGING SYSTEM FAILURE message to be displayed. It is commanded ON when a charging system DTC is a current DTC. The message is turned OFF when the conditions for clearing the DTC have been met.

Battery Voltage
The IPC displays the system voltage as received from the BCM over the serial data circuit. If there is no communication with the BCM, then the display will read all dashes until communication is restored.

Battery Saver Active
The BATTERY SAVER ACTIVE message will display on the driver information center (DIC) when the vehicle enters a load shed 2 event. Refer to for load shed 2 setting criteria.

and load shed 2 refers to a low voltage battery


DTC P0622

DTC Descriptor

DTC P0622



Generator F-Terminal Circuit
Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection\Initial Inspection and Diagnostic Overview\Diagnostic Starting Point - Vehicle

Circuit/System Description

The engine control module (ECM)/powertrain control module (PCM) uses the generator field duty cycle signal circuit to monitor the duty cycle of the generator. The generator field duty cycle signal circuit connects to high side of the field windings in the generator. A pulse width modulated (PWM) high side driver in the voltage regulator turns the field windings ON and OFF. The ECM/PCM uses the PWM signal input to determine the generator load on the engine. This allows the ECM/PCM to adjust the idle speed to compensate for high electrical loads. The ECM/PCM monitors the status of the generator field duty cycle signal circuit. When the key is in the RUN position and the engine is OFF, the ECM/PCM should detect a duty cycle near 0 percent . However, when the engine is running, the duty cycle should be between 5-95 percent .

Conditions for Running the DTC



The vehicle speed is above 8 km/h (5 mph) .
The system voltage is between 9.5-18 volts .
Conditions for Setting the DTC

The ECM/PCM detects an out of range PWM signal during the KEY ON test the ECM/PCM detects, a PWM signal greater than 65 percent for at least 5 seconds or during the RUN test a PWM signal less than 5 percent for at least 15 seconds .

Action Taken When the DTC Sets



The ECM/PCM will command the charge indicator and or warning message to be illuminated on the instrument panel cluster (IPC) and the driver information center (DIC), if equipped.
The ECM/PCM will not illuminate the malfunction indicator lamp (MIL).
The ECM/PCM will store conditions, which were present when the DTC set as Fail Records data only.
Conditions for Clearing the DTC



The ECM/PCM will command the message OFF after one trip in which the diagnostic test has been run and passed.
The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
Using the scan tool Clear DTC Information function can clear the DTC.
Circuit/System Verification

With the scan tool installed, ignition ON and the engine running, observe the GEN-F Terminal Signal parameter in the ECM/PCM data list. The GEN-F Terminal Signal parameter should read between 5-95 percent .

Circuit/System Testing



Ignition OFF, disconnect the generator harness connector.
The ignition ON, engine OFF, connect a test lamp to battery positive voltage and repeatedly probe the generator field duty cycle circuit, harness side while monitoring the GEN-F Terminal Signal Parameter in the data list. It should change from 0 percent to above 95 percent .
¤ If the GEN-F Terminal Signal parameter was not affected by the test lamp, test the GEN-F Terminal Signal circuit for a short to ground, a high resistance, an open circuit. If the circuit tests normal replace the ECM/PCM.

Go to Charging System Test. See: Starting and Charging\Testing and Inspection\Component Tests and General Diagnostics\Charging System Test
Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Verification Tests and Procedures



Control Module References for ECM/PCM replacement, setup, and programming
Generator Replacement (RPO LSJ) Generator Replacement (RPOs L61/LE5)

 

Update:

I just went out to start the car, and the interceptor gauges were barley on (dim). I left the car running because i was going to see if it was going to die. I just got off the phone with Josh from OTTP to see if he had a clue as to what is the problem. Well, no the car is reading 13.6 volts and its all good. But, why would the voltage dip like that? Even the power steering was out when i pulled into the parking lot. The radio was cutting in and out the lights were going on and off.

 

you have a wire coming from the alternator to the stater then to the fuse box, verify your cable is 100% connected and is in good working order, if it is, then id invest in a new alternator.....

 

P0562 System Voltage Low ECM, PCM, TCM
P0622 Generator F-Terminal Circuit ECM, PCM

these were the codes that i had.

where is the starter located? on the bottom front?

 

loderneath the car in the front, bottom of the engine. get a dvom, check amps and voltge coming out of the alternator, and check at batter for short or a wire with some resistance.

 

9/10 generator F codes end up getting an alternator that I have personaly done.

 

ive bought a alternator when i got the same codes. I checked the voltage coming out to the fuse box, but the cable from the alternator to the starter was broke and had three-5 strands left onit so the issue wasnt the alternator it was the cable.