故障コード索引 · medium
P1603
TCM EEPROM failure
TCM EEPROM failure
Documented for: 2.0L gasoline; 2.5L/3.0L gasoline · System(s): TRANS EOBD, TRANS OBD II · Factory MIL flag: 1
Common causes
- Battery disconnected while the ignition is switched ON B+ power supply circuit: open circuit TCM failure
Quick checks
- Confirm freeze-frame and conditions when the code set
- Inspect connectors, grounds, and harness for the circuit named in the code
- Compare live sensor values vs expected (unplugged/biased sensors are common)