Intermediate Shaft Speed Sensor Circuit Range/Performance
Your transmission's intermediate shaft speed sensor isn't sending reliable signals to the engine computer, like a speedometer that keeps giving jumpy readings. The ECU can't accurately monitor transmission speed, which affects shift timing and transmission performance.
The ECU monitors voltage signals from the intermediate shaft speed sensor, comparing actual shaft speed against expected values for current gear and engine load. When the sensor signal falls outside normal operating range or shows inconsistent patterns, the ECU triggers this fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Voltage Output | 0.5–4.5V with smooth AC signal variation | Erratic, missing, or constant voltage outside normal range |
| Shaft Speed Correlation | Matches engine RPM and gear ratio calculations | Speed reading implausible for current transmission state |
Code P0792 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, P0792 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.