Case Number: S2408000063 Rev. A

Release Date: August 2024

Symptom/Vehicle Issue: Service Hybrid Electric Vehicle System Warning Message
And Light Are Displayed. B273C-00 - Digital Crash Input Set In HCP
Discussion: The Customer may bring their vehicle in for service because the “Service
Hybrid Electric Vehicle System Warning” message and Light are displayed in the
cluster. The vehicle may no longer enter Electric or Hybrid drive modes. Upon
scanning for DTC’s, you may find B273C-00 set in the Hybrid Control Processor
(HCP).
This issue may be caused by Electromagnetic Interference (EMI) from the High
Voltage (HV) P2 Motor and associated HV harnesses which can transfer inductive
voltage/electric noise onto the R41 - Airbag Deployment Signal and R414 - Airbag
Deployment Signal 2 circuits. This inductive voltage/electric noise corrupts the health
status signal and causes the B273C-00 – Digital Crash Input DTC to set.
Diagnosis: Connect an oscilloscope such as the Mopar PicoScope to the R41 and
R414 circuits. When the P2 motor engages and begins operating, look for a distinctive
change in the voltage pattern which would confirm the presence of induction voltage/
electrical noise, See Fig. 1. Some EMI on these circuits is expected during normal
operation; however, some vehicles will exhibit more than others. If the electric noise is
beyond the acceptable threshold, B273C-00 – Digital Crash Input will set in the HCP
almost immediately after the noise is detected on the oscilloscope.
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
Stellantis US LLC

Version 4.5 06/08/2022

Fig. 1 :Electrical Noise on R41 and R414 Circuit After P2 Motor Engagement

Fig 2: Airbag Deployment Signal Circuits (R41 and R414)

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
Stellantis US LLC

Version 4.5 06/08/2022

Repair: As stated, some EMI is normal and will be observed on all vehicles and will not
induce any faults. However, if B273C-00 only becomes Active when electrical noise is
detected on R41 and R414 with an Oscilloscope. Excessive EMI on these circuits
should be considered the root cause.
A TSB/RSU flash software update for the HCP and AHCP is expected to be
released late Q3 2024. This software will increase the HCPs ability to detect a
valid Digital Crash Input health signal when excessive EMI is present.
If the vehicle is facing buyback, replacement of the components listed below have
been found to lower EMI to an acceptable level and remedy this concern on some
vehicles. Replacement of these components does not guarantee repair. The
components are listed in order (1-4) based on how common their replacement has
yielded successful repair of this issue in the field. These potential repairs should be
performed ONLY to mitigate buy back risk. Otherwise, you should wait until the Q3
HCP/AHCP software is released.
STAR Online Cases do not authorize warranty repairs. Replace these parts at
your own discretion after speaking with your dealer’s management.
Components should be replaced one at a time in the order listed below. Verification
replacement resolved the concern or not prior to replacing the next component.
1.
2.
3.
4.

P2 to PIM HV Harness: 68593176AB
P1 to PIM HV Harness: 68593175AB
BPCM to IDCM and BPCM to PIM HV Harnesses: 68378608AF and
68593178AC (Replace only these at the same time)
ORC (Reference STAR Parts for Part # and review TechTip)

Always verify you have the most current part number by referencing the vehicles VIN in
STAR parts.
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
Stellantis US LLC

Version 4.5 06/08/2022

Note: ORC Engineering has confirmed that airbag deployment and operation is not
compromised due to this fault or it’s setting conditions. The vehicle can be safely
released to the customer until the software update is made available. However, the
“Service Hybrid Electric Vehicle System Warning” message and MIL will continue to be
displayed. Electric and Hybrid drive modes will be inoperative as long as the B273C-00
– Digital Crash is Active.

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
Stellantis US LLC

Version 4.5 06/08/2022