S2008000075RevA

Case Number: S2008000075 REV. A
Release Date: July 2022
Symptom/Vehicle Issue: No Start, Start Stop Inoperative, Cluster Message Service Start Stop
System
Customer Complaint/ Technician Observation: Customer may observe a “Service
Start/Stop” message and that the start stop is inoperative. Owner also may complain of a no start
condition with a drained battery and the need to jump start the vehicle.
Technician observed: Diagnostic Trouble Code (DTC) P00FD BATTERY -B- STATE OF CHARGE
PERFORMANCE or P2AF5 STARTER RELAY STUCK
Auxiliary Battery Disconnected: During an initial key start, the Power Control Relay (PCR) is
commanded on (open) and the auxiliary battery State Of Charge (SOC) is evaluated. If the
Fused B+ voltage to the Powertrain Control Module (PCM) is so low aprox 8.0 volts that the
PCM experiences a reset during the initial key-on or engine crank event, the PCM will set
P00FD and Electric Start Stop (ESS) will be disabled.
The diagnostic for the P00FD fault is basically designed to detect a discharging,
discharged or disconnected Auxiliary Battery any time there is a disconnect between the
two Batteries. It detects this if the Fused B+ voltage to the PCM drops low enough to cause a
PCM reset when disconnected from the main/cranking battery. This fault will detect a faulty
auxiliary battery, or wiring issue between the auxiliary battery, Power Distribution Center (PDC)
and battery supply and the PCM.
Repair Procedure:
Set Conditions:
The PCM detects that the Auxiliary Battery is disconnected at initial key crank event.
The PCM detects that the Auxiliary Battery voltage is below 7.98 volts during an ESS AutoStart event.
The PCM detects that the Auxiliary Battery voltage is below 10.30 volts during an ESS AutoStart event, and the counter has reached 10 counts.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC
Version 4.3 10/29/2020
Battery Testing:
NOTE: If the vehicle is equipped with an Intelligent Battery Sensor (IBS), disconnect the IBS
connector first before disconnecting the negative battery cable and on dual battery vehicles it
is best to disconnect both negative battery cables during testing.
Caution: When testing the battery, disconnect the auxiliary battery ground cable before testing the
main battery to avoid false test results. The main battery SOC can be viewed in the Body Control
Module (BCM) data. Verify the static battery SOC readings for the primary battery, document
readings on repair order. Target battery SOC should be greater than 65% for ESS operation.
Vehicles that have had recent limited driving miles or were jump started may set DTC’s P00FD.
Refer to service diagnostics battery charging tables to ensure properly charged batteries prior to
further testing.
Note: Vehicles that have DTC - P00FD use the example DTC possible cause list
to further test. Inspect all main and AUX battery connections for loose or
corroded connections. Examples of multiple ground locations shown below.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC
Version 4.3 10/29/2020
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC
Version 4.3 10/29/2020
Example for 2019-2020, G901C
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC
Version 4.3 10/29/2020