The P068B: ECM/PCM Power Relay De-Energized Performance – Too Late code indicates that the ECM/PCM (Engine Control Module/Powertrain Control Module) power relay is de-energizing (turning off) later than expected. This can lead to electrical and engine control problems. The issue could be caused by a faulty relay, wiring problems, or a malfunction within the ECM/PCM itself.
P068B – Quick Overview
| Code | Information |
|---|---|
| Meaning | P068B: ECM/PCM Power Relay De-Energized Performance – Too Late |
| Is it serious? | Yes, as it can lead to electrical or engine control issues. |
| Possible causes | – ECM/PCM power relay de-energized too late – Faulty relay – ECM/PCM issue |
| How to diagnose? | – Test ECM/PCM power relay de-energized performance – Inspect wiring and connectors – Replace relay or ECM/PCM if necessary |
P068B Meaning
The P068B code means that the ECM/PCM power relay is de-energizing (turning off) later than it should. This late de-energizing could prevent the control module from properly shutting down, potentially causing electrical or engine control issues. The cause might be a faulty relay, wiring issue, or malfunction within the ECM/PCM.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional related codes that might provide more insight into the ECM/PCM or power relay system. | OBD-II Scanner |
| Test the ECM/PCM Power Relay for De-Energized Performance | Use a multimeter or diagnostic tool to monitor the relay’s de-energized timing and compare it with the manufacturer’s specifications. Ensure that the relay is turning off at the correct time. | Diagnostic Tool, Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors between the ECM/PCM and the power relay for signs of damage, loose connections, or corrosion that could delay the relay’s de-energizing. | Flashlight, Multimeter |
| Test the Power Relay | Test the ECM/PCM power relay to determine if it is the cause of the delayed de-energizing. Replace the relay if it is faulty. | Diagnostic Tool, Multimeter |
| Test the ECM/PCM | If the relay is working properly, test the ECM/PCM to ensure it is correctly controlling the relay’s de-energizing function. Replace the ECM/PCM if necessary. | Diagnostic Tool, Multimeter |
| Replace the Relay or ECM/PCM if Necessary | If the ECM/PCM or power relay is found to be faulty, replace the necessary component to restore proper operation. | Replacement Relay or ECM/PCM, Tools |
| Clear the Code and Test | After repairs, clear the code using an OBD-II scanner and test the vehicle to ensure that the ECM/PCM power relay is functioning correctly. | OBD-II Scanner, Vehicle Manual |
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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