Gear Control Malfunction 2
Your transmission's gear selection system isn't communicating properly with the engine computer, like a miscalibrated speedometer giving wrong readings. The ECU can't correctly identify which gear the transmission is in, disrupting shift logic and power delivery.
The ECM monitors gear position signals from transmission sensors (typically Hall effect or resolver sensors) and compares actual gear detection against expected shift patterns. When gear detection signals deviate from programmed thresholds or conflict with engine load and speed parameters, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Gear Position Signal Voltage | 0.5–4.5V (varies by sensor type) | Out of range or no signal detected |
| Gear Rationality Check | Gear matches engine speed/load logic | Implausible gear for current conditions |
Code P1735 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, P1735 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.