P0688
Computer Output Circuit — Code P0688
high
i Description
Diagnostic trouble code P0688 relates to the computer output circuit. The vehicle's control module has detected a fault condition in this circuit or system. Consult a manufacturer-specific service manual for detailed information about this code for your particular vehicle.
? Common Causes
- Internal ECU fault
- Communication bus error
- Corrupt calibration data
- Power supply issue
! Symptoms
- Check engine light
- Multiple fault codes
- Intermittent drivability issues
- No-start condition
# Diagnostic Steps
- Check ECU power and ground
- Scan for communication errors
- Reflash ECU if possible
- Replace ECU as last resort
⚙ Typical Fix
Diagnose and repair the computer output circuit fault. Inspect wiring, connectors, and the related component. Replace as necessary.
Parts Needed
Refer to manufacturer service manual for specific parts
Estimated Cost
$300-$1500
↔ Related Codes
Q Frequently Asked Questions
Code P0688 indicates a potentially serious issue with the computer output circuit. Have it diagnosed as soon as possible to avoid further damage or safety concerns.
Repair costs vary depending on the specific cause. For computer output circuit issues, expect to pay $300-$1500 in Australia, including parts and labour. Get a proper diagnosis before committing to repairs.
☞ Learn More
- What is OBD-II? — Complete guide to your car's diagnostic system
- How to Read DTC Codes — Step-by-step with a Bluetooth scanner
- OBD-II Scanner Buying Guide — Find the best scanner for your car