LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2021 >> Prius LE >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Meter / Gauge / Display - Diagnostic Codes & Symptom Tests >> Meter / Gauge System >> DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0129: Lost Communication with Brake System Control Module; DTC U0131: Lost Communication with Power Steering Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0151: Lost Communication with Restraints Control Module; DTC U0163: Lost Communication with Navigation Control Module; DTC U023A: Lost Communication with Front Camera Module; DTC U0293: Lost Communication with Hybrid Vehicle Control System; DTC U1104: Lost Communication with Driving Support ECU [11/2015 - 12/2018] >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0129: Lost Communication with Brake System Control Module; DTC U0131: Lost Communication with Power Steering Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0151: Lost Communication with Restraints Control Module; DTC U0163: Lost Communication with Navigation Control Module; DTC U023A: Lost Communication with Front Camera Module; DTC U0293: Lost Communication with Hybrid Vehicle Control System; DTC U1104: Lost Communication with Driving Support ECU [11/2015 - 12/2018]: Description

The combination meter assembly (meter circuit plate) communicates with the ECM, hybrid vehicle control ECU, skid control ECU (brake booster with master cylinder assembly), power steering ECU assembly, main body ECU (multiplex network body ECU), airbag ECU assembly, radio and display receiver assembly*1, navigation receiver assembly*2, forward recognition camera*3 and driving support ECU assembly*4 via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
U0100 Lost Communication with ECM / PCM "A" When IG voltage is 9.5 V or more and the following condition is detected:
  • No communication with ECM or hybrid vehicle control ECU continues for 3 seconds or more
  • ECM
  • Hybrid vehicle control ECU
  • CAN communication system
  • Combination meter assembly (Meter circuit plate)
 DTC stored -
U0129 Lost Communication with Brake System Control Module When IG voltage is 9.5 V or more and the following condition is detected:
  • No communication with skid control ECU (brake booster with master cylinder assembly) continues for 2 seconds or more
  • Skid control ECU (brake booster with master cylinder assembly)
  • CAN communication system
  • Combination meter assembly (Meter circuit plate)
 DTC stored -
U0131 Lost Communication with Power Steering Control Module When IG voltage is 9.5 V or more and the following condition is detected:
  • No communication with power steering ECU assembly continues for 3 seconds or more
  • Power steering ECU assembly
  • CAN communication system
  • Combination meter assembly (Meter circuit plate)
 DTC stored -
U0142 Lost Communication with Body Control Module "B" When IG voltage is 9.5 V or more and the following condition is detected:
  • No communication with main body ECU (multiplex network body ECU) continues for 3 seconds or more
  • Main body ECU (multiplex network body ECU)
  • CAN communication system
  • Combination meter assembly (Meter circuit plate)
 DTC stored -
U0151 Lost Communication with Restraints Control Module When IG voltage is 9.5 V or more and the following condition is detected:
  • No communication with airbag ECU assembly continues for 10 seconds or more
  • Airbag ECU assembly
  • CAN communication system
  • Combination meter assembly (Meter circuit plate)
 DTC stored -
U0163 Lost Communication with Navigation Control Module When IG voltage is 9.5 V or more and the following condition is detected:
  • No communication with radio and display receiver assembly*1 or navigation receiver assembly*2 continues for 3 seconds or more
  • Radio and display receiver assembly*1
  • Navigation receiver assembly*2
  • CAN communication system
  • Combination meter assembly (Meter circuit plate)
 DTC stored -
U023A Lost Communication with Front Camera Module When IG voltage is 9.5 V or more and the following condition is detected:
  • No communication with forward recognition camera continues for 10 seconds or more
  • Forward recognition camera
  • CAN communication system
  • Combination meter assembly (Meter circuit plate)
 DTC stored w/ Lane Departure Alert System
U0293 Lost Communication with Hybrid Vehicle Control System When IG voltage is 9.5 V or more and the following condition is detected:
  • No communication with hybrid vehicle control ECU continues for 10 seconds or more
  • Hybrid vehicle control ECU
  • CAN communication system
  • Combination meter assembly (Meter circuit plate)
 DTC stored -
U1104 Lost Communication with Driving Support ECU When IG voltage is 9.5 V or more and the following condition is detected:
  • No communication with driving support ECU assembly continues for 10 seconds or more
  • Driving support ECU assembly
  • CAN communication system
  • Combination meter assembly (Meter circuit plate)
 DTC stored w/ Pre-collision System
  1. *1: for Radio and Display Type
  2. *2: for Navigation Receiver Type
  3. *3: w/ Lane Departure Alert System
  4. *4: w/ Pre-collision System
scientia non olet · About LEMON Manuals