DTC C2121: Transmitter ID 1 not Received (Main); DTC C2122: Transmitter ID 2 not Received (Main); DTC C2123: Transmitter ID 3 not Received (Main); DTC C2124: Transmitter ID 4 not Received (Main); DTC C2125: Transmitter ID 5 not Received (Main); DTC C2181: Transmitter ID 1 not Received (for Test Diagnosis); DTC C2182: Transmitter ID 2 not Received (for Test Diagnosis); DTC C2183: Transmitter ID 3 not Received (for Test Diagnosis); DTC C2184: Transmitter ID 4 not Received (for Test Diagnosis); DTC C2185: Transmitter ID 5 not Received (for Test Diagnosis) [12/2019 - 11/2023]: Description
The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressure of each wheel. The measured values are transmitted to the tire pressure warning ECU and receiver in the vehicle as radio waves. The ECU compares the measured tire pressure values with the tire pressure threshold. When the measured tire pressure value is less than this threshold, the warning light in the combination meter assembly illuminates.
The tire pressure warning valve and transmitters constantly send radio waves to the tire pressure warning ECU and receiver.
Under the conditions below, the tire pressure warning ECU and receiver is unable to receive the signals from the tire pressure warning valve and transmitters, and a DTC is stored.
- Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
- Devices using similar radio frequencies are used in the vehicle.
- The ID of a tire pressure warning valve and transmitter is mistyped during registration.
- A tire, wheel and/or transmitter from a different vehicle is installed.
HINT:
When no transmitter ID is received from a tire pressure warning valve and transmitter for 20 minutes or more while the vehicle speed is more than 40 km/h (25 mph), or no transmitter ID is received from all of the tire pressure warning valve and transmitters for 20 minutes or more, DTCs from C2121 to C2124 (C2125: w/ Full Size Spare Tire) are stored.
DTCs C2121 to C2124 (C2125: w/ Full Size Spare Tire) can only be cleared by using the GTS. DTCs C2181 to C2184 (C2185: w/ Full Size Spare Tire) can be cleared when the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs C2181 to C2184 (C2185: w/ Full Size Spare Tire) are output only in test mode.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| C2121 | Transmitter ID 1 not Received (Main) | Either of the following conditions (a) or (b) is met: (a) When all conditions below are met:
(b) When both conditions below are met:
|
|
- |
| C2122 | Transmitter ID 2 not Received (Main) | Either of the following conditions (a) or (b) is met: (a) When all conditions below are met:
(b) When both conditions below are met:
|
|
- |
| C2123 | Transmitter ID 3 not Received (Main) | Either of the following conditions (a) or (b) is met: (a) When all conditions below are met:
(b) When both conditions below are met:
|
|
- |
| C2124 | Transmitter ID 4 not Received (Main) | Either of the following conditions (a) or (b) is met: (a) When all conditions below are met:
(b) When both conditions below are met:
|
|
- |
| C2125 | Transmitter ID 5 not Received (Main) | Either of the following conditions (a) or (b) is met: (a) When all conditions below are met:
(b) When both conditions below are met:
|
|
w/ Full Size Spare Tire |
| C2181 | Transmitter ID 1 not Received (for Test Diagnosis) | Test mode procedure is performed. |
|
- |
| C2182 | Transmitter ID 2 not Received (for Test Diagnosis) | Test mode procedure is performed. |
|
- |
| C2183 | Transmitter ID 3 not Received (for Test Diagnosis) | Test mode procedure is performed. |
|
- |
| C2184 | Transmitter ID 4 not Received (for Test Diagnosis) | Test mode procedure is performed. |
|
- |
| C2185 | Transmitter ID 5 not Received (for Test Diagnosis) | Test mode procedure is performed. |
|
w/ Full Size Spare Tire |
- When DTCs C2121 to C2124 (C2125: w/ Full Size Spare Tire) are stored, DTC C2179 may be stored simultaneously. In such cases, troubleshoot DTCs C2121 to C2124 (C2125: w/ Full Size Spare Tire) first, then troubleshoot DTC C2179.
- If any DTC from C2121 to C2124 (C2125: w/ Full Size Spare Tire) is output, clear the DTCs after repairing the malfunctions.
HINT:
It is necessary to perform the following procedure to identify the tire pressure warning valve and transmitter that is malfunctioning because it cannot be identified by the output DTC.