Transmission Range Sensor 'A' Circuit Low Input
There's a problem with the transmission range sensor that tells the computer the gear position.
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 sensor tracks what gear the vehicle is in and sends this info to the engine computer. If it detects a voltage drop below about 0.5 volts when it should be higher, it throws this code.
What the computer is actually seeing
The computer expects to see a specific voltage signal from the range sensor that correlates to the gear position. It should see 0.5 to 4.5 volts typically. If the signal is below 0.5 volts, it sets this code.
What a healthy reading looks like
0.5V to 4.5V depending on the gear position, ideally around 2.5V in neutral.
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.
- 1Visually inspect the transmission range sensor wiring and connector for damage or corrosion. Repair as necessary.
- 2Check the voltage at the transmission range sensor connector. Should be between 0.5V and 4.5V. If not, find the break or short in wiring.
- 3Test the resistance of the transmission range sensor itself according to manufacturer specifications. Replace if outside range.
- 4If all checks are good but the code persists, the ECM may be faulty.
Common causes
- Faulty transmission range sensor
- Wiring issues (shorts or opens)
- Bad connectors or corrosion
- Faulty engine control module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive with this code active?
Yes, but expect possible issues with shifting. It's better to fix it soon.
What happens if I ignore this code?
Ignoring it may cause worse shifting problems and could lead to transmission damage.
Does this code relate to other issues?
Yes, it can pair with other transmission codes if there's a deeper issue.
Working a real vehicle right now?
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