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.
DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0129-87: Lost Communication With Brake System Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U0164-87: Lost Communication with HVAC Control Module Missing Message [10/2022 - 11/2023]: Procedure
- CLEAR DTC
Result:
NEXT
See step 2
- CHECK DTC OUTPUT
- Turn the ignition switch off and wait for 30 seconds or more.
- Start the engine.
- Perform a road test.
- Read the DTCs.
Powertrain > Stop and Start > Trouble Codes
Result
Result Proceed to DTC U0100-87, U0129-87, U0140-87, U0151-87 or U0164-87 is output A DTC U0100-87, U0129-87, U0140-87, U0151-87 or U0164-87 is not output B
Result:
A
GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 11/2023]
Result:
B
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ]
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.