Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test F: U0293:87
- Refer to MODULE COMMUNICATIONS NETWORK
for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Module Controlled Functions - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition BCMC U0293:87 Lost Communication with Hybrid/EV Powertrain Control Module: Missing Message A continuous memory DTC that sets in the BCMC if data messages received from the SOBDMC are missing. Possible Sources
- Communication network concern
- Charging system concern
- SOBDMC
- BCMC (BJB)
- F1 VERIFY THE DIAGNOSTIC SCAN TOOL COMMUNICATES WITH THE SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C)
- Ignition ON.
- Connect the diagnostic tool.
- Check that a vehicle session can be established using the diagnostic scan tool.
Can a vehicle session be established?
Yes GO to F2 No REFER to: Module Controlled Functions - System Operation and Component Description . - F2 RECHECK THE BCMC (BODY CONTROL MODULE C) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Wait 10 seconds.
- Using a diagnostic scan tool, check the BCMC Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Is DTC U0293:87 retrieved again?
Yes GO to F3 No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - F3 RETRIEVE THE SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, perform the SOBDMCKOEO self-test.
Are any SOBDMC voltage system related Diagnostic Trouble Codes (DTCs) present?
Yes REFER to the appropriate Engine article for the procedure. No GO to F4 - F4 RETRIEVE THE BCMC (BODY CONTROL MODULE C) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, perform the BCMC self-test.
Are any BCMC Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to the BCMC DTC Chart. No GO to F5 - F5 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0293:87 SET IN OTHER MODULES
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Is DTC U0293:87 set in other modules?
Yes GO to F6 No GO to F7 - F6 CHECK FOR CORRECT SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE C) OPERATION
- Disconnect and inspect all SOBDMC connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect all SOBDMC connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new SOBDMC. No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. - F7 CHECK FOR CORRECT BCMC (BODY CONTROL MODULE C) OPERATION
- Disconnect and inspect all BCMC connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect all BCMC connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCMC. REFER to: Body Control Module C (BCMC) . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.