Code Definition

P1308 — Rough road sensor voltage too low

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Hyundai

About P1308

P1308 is a manufacturer-specific powertrain diagnostic trouble code recorded for Hyundai vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1308 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1308 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The rough road sensor, a body mounted accelerometer or G sensor, supplies the Engine Control Module with a voltage that reflects road surface vibration so the misfire monitor can be suspended over rough ground. DTC P1308 is set on Hyundai and Kia vehicles when the ECM sees the rough road sensor signal voltage below the normal operating range for too long. A persistently low voltage usually means the signal circuit is shorted to ground, the sensor has lost its reference or supply voltage, or the sensor itself has failed in a low output state. The practical effect is suspension of misfire detect...

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