DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM 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; DTC U111A-87: Lost Communication with ECM/PCM "A" (ch2) Missing Message; DTC U1170-87: Lost Communication with Brake System Control Module (Secondary CAN Line) Missing Message [02/2024 - ]: Procedure

Pre-procedure1

1. According to the display on the GTS, select "Health Check".

   Procedure1

2. Check for DTCs.

   Result

   Result	Proceed to
   ECM outputs P2530-12.	A
   ECM does not output P2530-12.	B

   Post-procedure1

3. Turn the ignition switch off.

Result: 

A 

GO TO DTC CHART (P2530-12) 

Refer to DTC P2530-12: Ignition Switch Run Position Circuit High Circuit Short to Battery [02/2024 - ]

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM 

Refer to DIAGNOSTIC TROUBLE CODE CHART [02/2024 - ]