The P0887: TCM Power Relay Control Circuit High refers to a situation where the transmission control module (TCM) is receiving an excessively high voltage from the power relay control circuit. This can lead to malfunctions in the transmission system, causing erratic performance or potential damage to the TCM.
P0887 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0887: TCM Power Relay Control Circuit High |
| Is it serious? | Yes, this can cause transmission control failure, leading to poor drivability or transmission failure. |
| Possible causes | – High voltage in the TCM power relay control circuit – Faulty TCM power relay – Wiring or connector issues |
| How to diagnose? | – Test the circuit for high voltage – Inspect wiring and connectors – Replace faulty components if needed |
P0887 Meaning
The P0887 code indicates that the power relay control circuit for the transmission control module (TCM) is experiencing excessively high voltage. This could be due to faulty wiring, a malfunctioning relay, or a poor electrical connection. If the TCM receives too much voltage, it may not be able to regulate transmission operation correctly, leading to shifting issues or erratic transmission behavior.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check if there are any additional codes that might provide more details on the issue. | OBD-II Scanner |
| Inspect Wiring and Connectors | Visually inspect the wiring and connectors related to the TCM power relay for signs of corrosion, damage, or loose connections. | Flashlight, Multimeter |
| Test TCM Power Relay Control Circuit for High Voltage | Use a multimeter to test the voltage in the TCM power relay control circuit. Compare the readings with manufacturer specifications. | Multimeter, Vehicle Manual |
| Test the TCM Power Relay | Verify if the TCM power relay is functioning correctly. If it is providing high voltage, replace it. | Multimeter, Replacement Relay |
| Replace Faulty Components | Replace any damaged wiring, connectors, or the TCM power relay as needed. | Replacement parts, Tools |
| Clear Code and Test Drive | After repairs are made, clear the code using an OBD-II scanner and take the vehicle for a test drive to confirm the problem is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the vehicle after the test drive to ensure that the P0887 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