The P0886: TCM Power Relay Control Circuit Low refers to an issue where the transmission control module (TCM) is receiving a low voltage signal from the power relay control circuit. This can prevent the TCM from operating correctly, leading to transmission performance problems or failure.
P0886 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0886: TCM Power Relay Control Circuit Low |
| Is it serious? | Yes, this can cause the transmission to malfunction, resulting in poor drivability or transmission failure. |
| Possible causes | – Low voltage in the TCM power relay control 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 |
P0886 Meaning
The P0886 code indicates that the power relay control circuit for the transmission control module (TCM) is experiencing low voltage. This could be due to wiring issues, a faulty relay, or poor electrical connections. If the TCM doesn’t receive enough voltage, it won’t be able to control the transmission properly, leading to shifting issues or the vehicle not operating as intended.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional codes that may offer more information about the issue. | OBD-II Scanner |
| Inspect Wiring and Connectors | Inspect the wiring and connectors in the TCM power relay control circuit for damage, corrosion, or loose connections. | Flashlight, Multimeter |
| Test TCM Power Relay Control Circuit for Low Voltage | Use a multimeter to test the voltage in the TCM power relay control circuit. Compare the voltage reading to manufacturer specifications. | Multimeter, Vehicle Manual |
| Test the TCM Power Relay | Test the TCM power relay for proper operation. If it’s faulty or providing insufficient voltage, replace it. | Multimeter, Replacement Relay |
| Replace Faulty Components | Replace any faulty wiring, connectors, or the TCM power relay as needed. | Replacement parts, Tools |
| Clear Code and Test Drive | After repairs are made, clear the code and take the vehicle for a test drive to ensure the problem is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the vehicle after the test drive to confirm that the P0886 code has not returned. | 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