P0890: Transmission Control Module Power Relay Sense Circuit Low
What to do
Usually little effect on how the car drives. Worth repairing, since the module is currently unable to verify its own power supply.
What this code means
The relay sense circuit reads below its valid range, normally a short to ground, which the module takes as the relay being permanently closed. Whether that is true is the question, and it is answered by measuring at the relay rather than trusting the sense line that is itself suspect.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Faulty transmission control module power relay · easy
Less common
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about P0890.