Output Speed Sensor Intermittent
Your transmission's output speed sensor is sending inconsistent signals to the engine computer, like a speedometer that keeps cutting out. This prevents the transmission from shifting smoothly and adapting to driving conditions properly.
The ECM monitors voltage pulses from the output speed sensor (OSS) to track transmission fluid speed and confirm gear engagement. It detects intermittent signal loss when voltage drops below threshold or pulses become irregular, indicating a failing sensor or wiring issue.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| OSS Signal Voltage | 0.5-4.5V with consistent pulse frequency | Intermittent dropouts or no signal for >500ms |
| Signal Frequency | Proportional to transmission output speed | Random signal loss or erratic frequency changes |
Code P0724 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0724 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.