What does code P1408 mean?

Q: What does code P1408 mean?

Maniforld Differential Pressure Sensor Circuit Fault. P1408 on Suzuki vehicles indicates that the powertrain control module (PCM) has detected an abnormal signal from the manifold differential pressure sensor circuit, which compares exhaust pressure before and after the diesel particulate filter (DPF) to estimate soot loading. The PCM monitors the sensor's voltage return and sets this code when the signal falls outside the expected range or behaves erratically during key-on or running conditions.

DTC codes / Suzuki codes / P1408

P1408 · SuzukiManiforld Differential Pressure Sensor Circuit Fault

P1408 on Suzuki vehicles indicates that the powertrain control module (PCM) has detected an abnormal signal from the manifold differential pressure sensor circuit, which compares exhaust pressure before and after the diesel particulate filter (DPF) to estimate soot loading. The PCM monitors the sensor's voltage return and sets this code when the signal falls outside the expected range or behaves erratically during key-on or running conditions.

SystemPowertrain

Code typeSuzuki specific

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for Suzuki vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.