P062C: Internal Control Module Vehicle Speed Performance
Code P062C indicates that the Engine Control Module (ECM) has detected an internal performance issue with the vehicle speed signal. This typically means the ECM is not receiving or processing the vehicle speed data correctly from the wheel speed sensors or other modules. The fault can be due to a software glitch, hardware failure within the ECM, or communication errors on the CAN bus. It may also be triggered by aftermarket modifications or a low battery voltage.
01. Most Common Causes
- Faulty Engine Control Module (ECM)
- Corrupted ECM software or calibration
- CAN bus communication issues
- Low battery voltage or poor electrical connections
- Aftermarket performance chips or modifications
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Speedometer or odometer malfunction
- Transmission shifting issues
- Cruise control inoperative
- Reduced engine performance or limp mode
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Inspect battery voltage and charging system; ensure battery is fully charged.
Step 3: Check for any aftermarket modifications or recent software updates.
Step 4: Perform a CAN bus integrity test to check for communication faults.
Step 5: If all else fails, reprogram or replace the ECM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause transmission issues, speedometer failure, and unexpected loss of power. Have the vehicle diagnosed promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. If ECM replacement is needed, parts and labor can range from $500-$1500. Reprogramming may cost $100-$300.