P0708: Transmission Range Sensor A Circuit High Input

What does P0708 mean?

Transmission range sensor A input is above the expected range or gives an invalid high/multiple-input pattern, depending on the design. The controller may enter a fail-safe gear because the selected range is uncertain.

Generic OBD-II definition: Transmission Range Sensor A Circuit High Input. Confirm applicability in your vehicle service information.

Common causes

• Signal shorted to voltage
• Failed range sensor
• Misadjusted selector cable or sensor

Symptoms

• Limp mode
• Incorrect PRNDL display
• Delayed or harsh engagement

Diagnostic focus

Some range switches encode position with several circuits. Use the complete position chart rather than assuming a single voltage must rise smoothly as the lever moves.

Can I keep driving with P0708?

Severity: High Keep the vehicle secured and do not drive if the selected gear, displayed gear, or starting interlock is unreliable. Arrange diagnosis rather than bypassing the range/neutral-safety system.

If the check engine light is flashing or the car runs badly, stop driving and have it checked.

Typical fixes

• Compare the range inputs with the specified switch chart
• Inspect for crossed or shorted wiring
• Check cable and sensor adjustment

Sources & review

• OBD-Codes.com: P0708
• TroubleCodes.net: generic code definitions

Definitions and diagnostic background checked 2026-11-06. Generic guidance, not a substitute for the service procedure for your exact year, engine, and transmission.