ECM/PCM Power Relay De-Energized Performance - Too Late
The P068B code indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) detected that the power relay de-energized later than expected when the ignition was turned off. This can be caused by a failing relay, wiring issues, or a fault within the ECM/PCM itself. The delay may lead to battery drain or improper module shutdown.
01. Most Common Causes
- Faulty ECM/PCM power relay
- Corroded or loose relay connections
- Short circuit or high resistance in relay control circuit
- Internal ECM/PCM failure
02. Symptoms You Will Notice
- Battery drain overnight
- Engine may not start or start slowly
- Check Engine Light illuminated
- Intermittent electrical issues
03. Step-by-Step Diagnosis
Step 1: Scan for other codes and record freeze frame data.
Step 2: Inspect the ECM/PCM power relay and its socket for corrosion or damage.
Step 3: Test relay operation using a multimeter; check for delayed de-energization.
Step 4: Check wiring and connectors for shorts, opens, or high resistance.
Step 5: If relay and wiring are good, suspect internal ECM/PCM fault and perform further module testing.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as it can cause battery drain and potential stalling. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for relay replacement; ECM replacement can cost $500-$1000.