U0688
Lost Communication With Throttle Position Sensor/Switch G
U0688 is an OBD-II diagnostic trouble code meaning: Lost Communication With Throttle Position Sensor/Switch G. Common causes: open or short circuit in the sensor circuit, throttle position sensor malfunction. Estimated repair cost: $17–56.
Symptoms
- Check Engine light comes on
- The engine goes into emergency mode
- Unstable operation at idle
- Reduced engine power
- Dips when pressing the gas pedal
Causes
- Open or short circuit in the sensor circuit
- Throttle position sensor malfunction
- Poor contact in the sensor connector
- Problems with power or circuit ground
- Engine ECU malfunction
How to Fix
- Check the integrity of the sensor wires and connectors
- Test the throttle position sensor with a multimeter
- Check the supply voltage and ground in the sensor circuit
- Replace faulty TPS sensor if necessary
- Reset the error and check the system operation
Related codes
Error U0688 by Vehicle Brand
FAQ
What does the U0688 code mean?
U0688 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Throttle Position Sensor/Switch G
What causes a U0688 error code?
The most common causes of U0688 include: Open or short circuit in the sensor circuit; Throttle position sensor malfunction; Poor contact in the sensor connector; Problems with power or circuit ground.
How do I fix a U0688 diagnostic trouble code?
To fix U0688: Check the integrity of the sensor wires and connectors. Test the throttle position sensor with a multimeter. Check the supply voltage and ground in the sensor circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0688?
Limited driving only, diagnose soon
How much does it cost to fix U0688?
The estimated repair cost for U0688 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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