DTC U2138-00: Communication Error With Rear Side Radar Sensor (LH) [Vehicle Control Module]: Outline
WARNING: This page is about a different car, the 2021 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DTC U2138:00 [VEHICLE CONTROL MODULE] DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Communication error with rear side radar sensor (LH) |
| Detection condition |
- The vehicle control module (VCM) detects that the rear side radar sensor (RH) cannot receive the CAN signal from the rear side radar sensor (LH) for 15 s.
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| Fail-safe |
(See DTC TABLE [VEHICLE CONTROL MODULE (US)] .) |
| Possible cause |
- Rear side radar sensor (LH) connector or terminal malfunction
- Short to ground or open circuit in rear side radar sensor (LH) power supply circuit
- Rear side radar sensor (LH) ground circuit malfunction
- Rear side radar sensor (RH) connector or terminal malfunction
- Short to ground in local CAN circuit
- Short to power supply in local CAN circuit
- Open circuit in local CAN circuit
- Rear side radar sensor (LH) malfunction
- Rear side radar sensor (RH) malfunction
- Vehicle control module (VCM) malfunction (built into body control module (BCM))
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 Courtesy of MAZDA MOTORS CORP.
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