ECM/PCM Power Relay De-Energized Too Early
The P068A code indicates that the ECM/PCM power relay de-energized earlier than expected after the ignition is turned off. This relay supplies power to the engine control module (ECM) and other critical components. When it opens prematurely, the ECM may lose power before completing post-shutdown routines, potentially causing driveability issues, no-start conditions, or stored fault codes. Common causes include a faulty relay, wiring issues, low battery voltage, or a failing ECM.
01. Most Common Causes
- Faulty ECM/PCM power relay
- Corroded or loose relay socket connections
- Low battery voltage or weak battery
- Wiring issues (shorts, opens) in relay control circuit
- Failing ECM/PCM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine may stall or not start
- Intermittent electrical issues
- Loss of memory settings (radio, clock)
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Test battery voltage and charging system; ensure battery is fully charged.
Step 3: Locate the ECM/PCM power relay and inspect for corrosion or damage.
Step 4: Swap relay with a known good one (if identical) and clear codes to see if returns.
Step 5: Check relay control circuit for opens/shorts using a multimeter.
Step 6: If all else passes, test ECM/PCM for proper operation (may require professional scan tool).
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may stall unexpectedly or fail to restart, posing a safety risk.
How much does it cost to fix?▼
Typically $50-$150 for relay replacement; if ECM replacement is needed, costs can exceed $500.