The P0890: TCM Power Relay Sense Circuit Low refers to a problem where the transmission control module (TCM) power relay sense circuit is detecting a low voltage condition. This can cause the TCM to malfunction, potentially leading to transmission control issues.
P0890 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0890: TCM Power Relay Sense Circuit Low |
| Is it serious? | Yes, this can lead to improper transmission operation or failure to control the transmission correctly. |
| Possible causes | – Low voltage in the TCM power relay sense circuit – Faulty TCM power relay – Wiring or connector issues |
| How to diagnose? | – Test the circuit for low voltage – Inspect wiring and connectors – Replace faulty components if needed |
P0890 Meaning
The P0890 code indicates that the TCM is detecting a low voltage condition in the power relay sense circuit. This could result from a weak connection, faulty wiring, or a malfunctioning TCM power relay. If the voltage is too low, the TCM may not be able to control the transmission properly, leading to poor drivability or failure to shift.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for other related codes. | OBD-II Scanner |
| Inspect Wiring and Connectors | Visually inspect wiring and connectors for damage, corrosion, or disconnections. | Flashlight, Multimeter |
| Test TCM Power Relay Sense Circuit for Low Voltage | Use a multimeter to test the sense circuit for low voltage. Compare to manufacturer specifications. | Multimeter, Vehicle Manual |
| Test the TCM Power Relay | Test the TCM power relay for functionality. Replace if necessary. | Multimeter, Replacement Relay |
| Replace Faulty Components | Replace any damaged wiring, connectors, or the TCM relay if found to be faulty. | Replacement parts, Tools |
| Clear Code and Test Drive | After repairs, clear the code and perform a test drive to verify the fix. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P0890 code does not return. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko