NHTSA ID Number: 11028183
Manufacturer Communication Number: 2078866/2
TSB/Document Date: 2026-02-04
Summary
DTC B1A7BF0 HV Insulation Fault – Red Electrical System Fault | Continental GT/GTC /Flying Spur | 25-26MY. Customer Statement: The customer may report that a red warning appears on the Driver’s Instrument Panel (DIP) with the message “Safely Stop Vehicle” and an electrical system fault.
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TSB/Document ID: 2078866/2
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-21
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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Technical product information
Topic
DTC B1A7BF0 HV Insulation Fault – Red Electrical System Fault | Continental GT/GTC
/Flying Spur | 25-26MY
Market area
Bentley: worldwide (2WBE),China 796 VW Import Comp. Ltd (Vico), Beijing (6796)
Brand
Bentley
Transaction
No.
2078866/2
Level
EH
Status
Released for publishing
Release
date
Jan 20, 2026
Event memory entries
Fault
type
Fault
status
Diagnostic address
Event memory entry
008C - Hybrid battery
management
P2C8900: Hybrid/EV Battery System Precharge
Current Too High
Intermittent
008C - Hybrid battery
management
P0C7800: Hybrid/EV Battery System Precharge Time
Too Long
Intermittent
008C - Hybrid battery
management
B1A7BF0: HV insulation measurement faulty
Intermittent
New customer code
Object of complaint
Complaint type
electrical power, electric system, data transfer -> power supply ->
high-voltage battery
control units, services -> error
message
Vehicle data
25-26MY Continental GT/GTC & Flying Spur
Sales types
Type MY
Brand Designation Engine code Gearbox code Final drive code
Z23* 2025 E
*
*
*
Z23* 2026 E
*
*
*
Z24* 2025 E
*
*
*
INTERNAL
Position
Z24* 2026 E
*
*
*
Z32* 2025 E
*
*
*
Z32* 2026 E
*
*
*
Documents
master.xml
INTERNAL
Connection offline
Transaction No.:
2078866/2
DTC B1A7BF0 HV Insulation Fault – Red Electrical System Fault | Continental GT
/GTC/Flying Spur | 25-26MY
Customer statement / workshop findings
Customer Statement
The customer may report that a red warning appears on the Driver’s Instrument Panel (DIP) with the
message “Safely Stop Vehicle” and an electrical system fault.
Workshop Findings
The following DTC is stored in the HV Battery Management Unit (diagnostic address 008C):
•
B1A7BF0 (HV insulation measurement faulty – Fault type 2: Passive/sporadic) with symptom 40976
(Status: 00101000)
And/or
•
P0C7800 (Hybrid/EV Battery System Precharge Time too long) with symptom 14417987
•
P2C8900 (Hybrid/EV Battery System Precharge Current Too High) with symptom 14419331
(NOTE: DTC P0C7800 and P2C8900 show a MIL symptom rather than red electrical system fault)
Technical background
A software update package has been released to address this customer concern and rectify associated
diagnostic trouble codes. Performing this vehicles software update will allow the vehicle to return to full
operation as intended, and restores full system integrity.
If the customer statement and workshop findings are verified. Refer to the measure section and complete all
applicable steps to completion.
Production change
Software enhancement applied in series production.
Measure
Resolve by performing software updates to the following control units:
Previous Software
New Software
DA [008C] HV Battery Management Control Module
– 0204
DA [008C] – 0207
INTERNAL
DA [06D0] Battery Junction Box - 0207
DA [06D0] – No Change
DA [8104] High Voltage DC/DC Converter – 0002/
0005
DA [8104] - 0010
DA [0008] HVAC Control module - 0670
DA [0008] - 850
SVM Applicability Table
25MY SVM Codes
26MY SVM Codes
SVM Code Input 1
SVM Code Input 1
372BIL10572HV01 (Continental GT/GTC)
372BIL1083HV01 (Continental GT/GTC)
373BIL10572HV01 (Flying Spur)
373BIL1083HV01 (Flying Spur)
SVM Code Input 2
SVM Code Input 2
372BIL1057201 (Continental GT/GTC)
372BIL108301 (Continental GT/GTC)
373BIL1057201 (Flying Spur)
373BIL108301 (Flying Spur)
Software Update Instructions
CAUTION
The Bentley ODIS-S Brand Version MUST be at least 2.35.9 (or higher)
CAUTION
ODIS and ensure that DoIP is selected before proceeding. Within ODIS-S, perform the following:
communication”.
CAUTION
DO NOT, UNDER ANY CIRCUMSTANCES, ATTEMPT TO CONDUCT THE SOFTWARE UPDATE VIA
THE CAN NETWORK. ONLY DoIP SHOULD BE USED WHEN PERFORMING THE SVM UPDATE.
CAUTION
You MUST ONLY use the Diagnosis Interface VAS 6154 (WiFi Diagnostic Tool) in USB OPERATION or
the CABLE-CONNECTED VAS 5055 for the reprogramming (updating) of the control units.
If neither of these units are available, the VAS 5054 (A) may be used in USB MODE.
INTERNAL
Battery Charger
CAUTION
ONLY Chargers that meet the approved specification on the Mandatory Equipment List (available on the
Bentley Hub) MUST be used.
The charger must be set to a mode where a MINIMUM of 90a is supplied to the battery during the
process. Typically, this is known as ‘Power Supply Mode’ or ‘DIAG+ Mode’.
Please refer to the manual to ensure that these requirements are met before beginning any SVM
update
Preparation before update
WARNING
CAUTION
illumination, exterior lights ect.
Conduct a full guided fault find of the vehicle.
Address any unknown faults BEFORE conducting any of the below updates, referencing the applicable TPI.
Ensure that the correct battery charger is connected to the vehicle. – Refer to the ‘’Battery Charger’’ Section
above.
High Voltage Shutdown
WARNING
De-energise the high-voltage system via ODIS-S. Refer to ElsaPro, Repair Group 93 – “De-energising
high-voltage system” to do so.
SVM Code Input 1
CAUTION
INTERNAL
1. After a suitable battery charger is connected, select the Special Functions tab.
2. Navigate to ‘SVM – Code Input’ and enter the applicable SVM Input 1 code if required from the SVM
applicability table.
NOTICE
3. On the next screen, ensure that the SVM code is correct.
4. You will be shown the communication type. This MUST be set to “DoIP”.
a. If “DoIP” is not selected, select option 3 until the communication type is set to “DoIP”.
5. Ensure that the diagnostic device remains connected for the duration of the update.
6. Follow all on-screen prompts until the program ends.
a. You may be required to perform various ignition cycles during the test so ensure that you are situated
around the vehicle/ODIS-S device for the full update.
7. If you encounter any errors during the update, please refer to TPI 2078962 - ‘ODIS Error Message – Best
Practice When Performing Baseline (BiL) Updates’.
a. Please raise a FULL TECHNICAL DISS query.
b. Customer Statement: “2078866 Support”
c. Workshop Findings: Give a summary of the error encountered and ensure that the latest Guided FaultFinding log is submitted online.
8. Read the identification data from each ECU in the table below and verify that software versions match the
target.
Right click relevant control unit > Guided Functions > Read Identification Data
Diagnostic Address
ECU name
Target Software version
008C
BMC
207
06D0
BJB
207
8104
DC/DC Converter
0010
INTERNAL
0008
HVAC
850
If the software does not match the target software. Rerun SVM code input, If the software version cannot be
corrected.
a. Please raise a FULL TECHNICAL DISS query.
b. Customer Statement: “2078866 Support”
c. Workshop Findings: Give a summary of the error encountered and ensure that the latest Guided FaultFinding log is submitted online.
SVM Code Input 2
9. Navigate to ‘SVM – Code Input’ and enter the applicable SVM Input 2 code if required from the SVM
applicability table.
10. Follow the steps 2-6.
11. If you encounter any errors during the update, please refer to TPI 2078962 - ‘ODIS Error Message – Best
Practice When Performing Baseline (BiL) Updates’.
a. Please raise a FULL TECHNICAL DISS query.
b. Customer Statement: “2078866 Support”
c. Workshop Findings: Give a summary of the error encountered and ensure that the latest Guided Fault
Finding log is submitted online.
12. After successful completion of the update, perform the following.
a. Turn off the ignition
b. Remove all equipment from the car (Diagnostic tester/dongle, battery charger, keys)
c. Close all doors, windows, bonnet and boot lid
d. Lock the vehicle to perform a CAN-BUS sleep (wait 15 minutes).
WARNING
Re-energise the high-voltage system via ODIS-S. Refer to ElsaPro, Repair Group 93 – “Re-energising
high-voltage system” to do so.
13. After 15 minutes, unlock and open the driver’s door. Turn on the ignition, re-connect the battery charger
and diagnostic dongle.
INTERNAL
14. Re-run guided fault finding and clear DTCs. If any faults are present, refer to TPI 2075920. If any other
faults are present, please raise a full DISS query with a full GFF log uploaded online stating the error
encountered.
15. If in the event the issue is not resolved the operative must respond via an existing DISS query or raise a
new technical DISS query and await a response before conducting any further work.
Warranty accounting instructions
Warranty Type – 110 or 910
Damage Service Number – 87 11
Damage Code – 02 02
Time to perform SVM Update
Labour Operation Code: 01 51 00 00
Time: As per ODIS log (Must not exceed 100 TU)
Additional Time Allowance
A 100TU allowance may be claimed only if a SVM update fails to complete successfully. This is intended to
cover additional diagnostic or recovery work directly resulting from the failed update. It must not be used for
unrelated delays or issues.
ODIS logs must be attached to a DISS ticket for evidence of failure. Claims without valid documentation will
be rejected. Warranty Adjudicators will review associated ODIS logs and DISS queries to determine actual
software update time.
INTERNAL
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