LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2024 >> Prius LE >> Repair and Diagnosis (Single Page) >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Motor Generator Control System (HEV) - Diagnostic Codes (5 Of 5) >> MOTOR GENERATOR CONTROL SYSTEM (for M20A-FXS) >> DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0293-87: Lost Communication With Hybrid Powertrain Control Module Missing Message; DTC U1170-08: Lost Communication with Brake System Control Module (ch2) Bus Signal / Message Failure; DTC U1170-87: Lost Communication With Brake System Control Module (ch2) Missing Message [12/2022 - ] >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0293-87: Lost Communication With Hybrid Powertrain Control Module Missing Message; DTC U1170-08: Lost Communication with Brake System Control Module (ch2) Bus Signal / Message Failure; DTC U1170-87: Lost Communication With Brake System Control Module (ch2) Missing Message [12/2022 - ]: Description

The motor generator control ECU communicates with the hybrid vehicle control ECU, ECM and skid control ECU assembly via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate DTC Output from Priority Note
U0100-87 Lost Communication With ECM/PCM "A" Missing Message A CAN communication error between the ECM and motor generator control ECU (CAN communication system malfunction) occurs
(1 trip detection logic)
CAN communication system Comes on Master Warning:
Comes on
Motor Generator B SAE Code:
U0100
U0293-87 Lost Communication With Hybrid Powertrain Control Module Missing Message A CAN communication error between the hybrid vehicle control ECU and motor generator control ECU (CAN communication system malfunction) occurs
(1 trip detection logic)
CAN communication system Comes on Master Warning:
Comes on
Motor Generator B SAE Code:
U0293
U1170-08 Lost Communication with Brake System Control Module (ch2) Bus Signal / Message Failure A CAN communication error between the skid control ECU assembly and motor generator control ECU (CAN communication system malfunction) occurs
(1 trip detection logic)
CAN communication system Does not come on Master Warning:
Comes on
Motor Generator B SAE Code:
U1170
U1170-87 Lost Communication With Brake System Control Module (ch2) Missing Message A CAN communication error between the skid control ECU assembly and motor generator control ECU (CAN communication system malfunction) occurs
(1 trip detection logic)
CAN communication system Comes on Master Warning:
Comes on
Motor Generator B SAE Code:
U1170