Transmission Range Switch Circuit Low
The transmission range switch is not providing the expected signal to the computer.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The transmission range switch, which tells the computer the gear position, is giving a low voltage signal (under 0.8 volts).
What the computer is actually seeing
The transmission control module (TCM) expects a voltage signal between 0.8 volts to 4.0 volts depending on the gear position, but it sees readings consistently lower than 0.8 volts.
What a healthy reading looks like
Expected voltage values for the range switch: P (4.0V), R (3.5V), N (2.5V), D (1.0V), and L (0.8V) or similar based on the vehicle.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the vehicle's battery voltage - it should be between 12.4V and 12.7V when the engine is off.
- 22. Inspect the wiring and connectors to the transmission range switch for damage - look for frayed wires or corrosion.
- 33. Use a multimeter to measure the voltage at the transmission range switch connector - should be between 0.8V and 4.0V indicating proper function.
- 44. If the voltage is below 0.8V, check the switch itself by removing it and testing it independently according to manufacturer specs (usually should show continuity in correct positions).
- 55. If all else checks out, replace the transmission range switch.
Common causes
- Faulty transmission range switch
- Wiring issues (shorts, open circuits)
- Connector problems (corrosion, loose connections)
- Battery voltage issues affecting sensor readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It depends. While you can drive, you may experience shifting issues or limp mode, so fix it as soon as you can.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does it pair with other codes like P0705?
Those codes may indicate related transmission range or sensor problems.
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