DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0129: Lost Communication with Brake System Control Module; DTC U0293: Lost Communication with Hybrid Vehicle Control System [10/2014 - 09/2017]: Description

The hybrid vehicle control ECU communicates with the ECM and brake booster with master cylinder assembly (skid control ECU). When the hybrid vehicle control ECU does not receive data from the ECM or brake booster with master cylinder assembly (skid control ECU), the hybrid vehicle control ECU stores DTC U0100 or U0129.
The ECM communicates with the hybrid vehicle control ECU. When the ECM does not receive data from the hybrid vehicle control ECU, the ECM stores DTC U0293.
The brake booster with master cylinder assembly (skid control ECU) communicates with the hybrid vehicle control ECU. When the brake booster with master cylinder assembly (skid control ECU) does not receive data from the hybrid vehicle control ECU, the brake booster with master cylinder assembly (skid control ECU) stores DTC U0293.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
U0100	Lost Communication with ECM / PCM "A"	The hybrid vehicle control ECU does not receive data from the ECM.	Open or short in sub bus 15 main wire or connector Open or short in sub bus 15 branch wire or connector Power source circuit of hybrid vehicle control ECU Hybrid vehicle control ECU ground circuit Hybrid vehicle control ECU Power source circuit of ECM ECM ground circuit ECM Open or short in No. 1 CAN junction connector	Hybrid vehicle control ECU
U0129	Lost Communication with Brake System Control Module	The hybrid vehicle control ECU does not receive data from the brake booster with master cylinder assembly (skid control ECU).	Open or short in sub bus 15 main wire or connector Open or short in sub bus 15 branch wire or connector Power source circuit of hybrid vehicle control ECU Hybrid vehicle control ECU ground circuit Hybrid vehicle control ECU Power source circuit of brake booster with master cylinder assembly (skid control ECU) Brake booster with master cylinder assembly (skid control ECU) ground circuit Brake booster with master cylinder assembly (skid control ECU) Open or short in No. 1 CAN junction connector	Hybrid vehicle control ECU
U0293	Lost Communication with Hybrid Vehicle Control System	The ECM does not receive data from the hybrid vehicle control ECU. The brake booster with master cylinder assembly (skid control ECU) does not receive data from the hybrid vehicle control ECU.	Open or short in sub bus 15 main wire or connector Open or short in sub bus 15 branch wire or connector Power source circuit of ECM ECM ground circuit ECM Power source circuit of hybrid vehicle control ECU Hybrid vehicle control ECU ground circuit Hybrid vehicle control ECU Power source circuit of brake booster with master cylinder assembly (skid control ECU) Brake booster with master cylinder assembly (skid control ECU) ground circuit Brake booster with master cylinder assembly (skid control ECU) Open or short in No. 1 CAN junction connector	ECM Brake booster with master cylinder assembly (skid control ECU)