Transmission Range Sensor A Circuit PRNDL Input
P0705 means Transmission Range Sensor A Circuit PRNDL Input. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.
What you may notice
Symptoms
- 01Check Engine or transmission warning light
- 02Harsh, delayed, missing, or incorrect shifts
- 03Transmission fail-safe or limp mode
- 04Speedometer or cruise-control issues on speed-sensor faults
Where to look first
Common causes
- 01Sensor, solenoid, range-switch, or internal harness fault
- 02Low, contaminated, overheated, or incorrect transmission fluid
- 03Connector corrosion, damaged wiring, or poor ground
- 04Hydraulic, valve-body, clutch, or internal mechanical problem
A sensible sequence
Best diagnostic order
- 01Read transmission-module codes and save freeze-frame data
- 02Verify fluid level, condition, temperature, and visible leaks
- 03Inspect wiring and test the affected sensor, switch, or solenoid circuit
- 04Compare input speed, output speed, commanded gear, and actual ratio
- 05Verify the repair during a controlled road test
Step by step
What to check and repair
- 01Check fluid level and condition using the manufacturer procedure
- 02Inspect the transmission connector and external wiring
- 03Compare commanded gear, speed signals, temperature, and solenoid state
- 04Perform circuit, hydraulic, and mechanical tests before major repair
Read the signals
Live-data clues
Input and output speed
- Typical behavior
- Signals should be stable and consistent with vehicle speed and selected gear
- Possible clue
- A missing or erratic signal can cause incorrect ratio or shift decisions
Commanded gear and solenoid state
- Typical behavior
- The actual ratio should follow the commanded gear
- Possible clue
- A mismatch may be electrical, hydraulic, or mechanical
Transmission fluid temperature
- Typical behavior
- The reading should be plausible and change gradually
- Possible clue
- An implausible value can alter shift strategy or indicate a sensor circuit fault
| Parameter | Typical behavior | What it can suggest |
|---|---|---|
| Input and output speed | Signals should be stable and consistent with vehicle speed and selected gear | A missing or erratic signal can cause incorrect ratio or shift decisions |
| Commanded gear and solenoid state | The actual ratio should follow the commanded gear | A mismatch may be electrical, hydraulic, or mechanical |
| Transmission fluid temperature | The reading should be plausible and change gradually | An implausible value can alter shift strategy or indicate a sensor circuit fault |
What P0705 means
P0705 is a generic powertrain diagnostic trouble code defined as “Transmission Range Sensor A Circuit PRNDL Input.” The vehicle control module stored it after the monitored circuit or system failed its expected test. The code identifies the area and failure type; it does not by itself prove that one named component must be replaced.
Diagnostic direction
Transmission codes need electrical, fluid, hydraulic, and mechanical checks in that order. A solenoid or ratio code does not automatically mean the complete transmission has failed.
Before clearing the code
Save stored, pending, and permanent codes plus freeze-frame data. Note the operating condition that set the code, inspect related connectors and wiring, and check vehicle-specific service information. After a verified repair, clear the code only when appropriate and repeat the enabling conditions to confirm that it does not return.