OBD-II Generic Error Code P0973: How to Fix It

Q: Can I drive my car with a P0973 code?

You can drive short distances, but it is not recommended for extended use. P0973 can cause your vehicle to enter limp mode, limiting it to one or two gears to protect the transmission. Continued driving with a faulty shift solenoid circuit can cause harsh shifting, overheating, and potentially accelerate internal transmission wear. Get the issue diagnosed and repaired as soon as possible.

Q: What causes the P0973 code?

The most common causes are a failed or shorted Shift Solenoid A, a wiring harness that is damaged, frayed, or corroded causing a short to ground, a loose or corroded transmission connector, low or degraded transmission fluid affecting solenoid operation, or in less common cases a faulty Transmission Control Module (TCM).

Q: How much does it cost to fix a P0973 code?

Repair costs vary based on the root cause. A wiring repair may cost $75–$200 at a shop for labor and materials. A shift solenoid replacement, including the required fluid and filter service, typically runs between $150 and $400 at an independent shop, or higher at a dealership. If the TCM itself is faulty, replacement and reprogramming can cost $500–$1,500 or more depending on the vehicle.

Q: Will a transmission fluid change fix P0973?

A fluid change alone is unlikely to fix P0973 if the solenoid or wiring is the root cause. However, if severely degraded fluid was contributing to solenoid sluggishness, a fluid and filter service should be performed as part of the overall repair. Always check and refresh the fluid as part of the diagnostic process, but do not expect it to resolve a true electrical circuit fault on its own.

Q: What is the difference between P0973 and P0974?

P0973 indicates the Shift Solenoid A control circuit is reading abnormally LOW voltage, which typically points to a short to ground or a shorted solenoid coil. P0974 indicates the same circuit is reading abnormally HIGH voltage or is open, which typically points to a broken wire, open circuit in the solenoid coil, or a disconnected connector. Both codes relate to Shift Solenoid A but point to opposite electrical faults in the circuit.

Abstract

Error code P0973 means your vehicle's transmission control module (TCM) has detected an abnormally low voltage signal on the Shift Solenoid A control circuit. Shift solenoids are small electrically-operated valves inside your transmission that control how and when your vehicle shifts gears. If left unaddressed, this fault can cause rough or missed gear shifts, reduced fuel economy, and in some cases your vehicle may enter 'limp mode' to protect the transmission from further damage.