OBD-II code · Network
U0688 Lost Communication With Throttle Position Sensor/Switch G
The vehicle bus reports loss of communication with smart throttle position sensor G. The ECM loses one of the redundant throttle channels and reverts to a fail-safe map.
Is it safe to drive with U0688?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Throttle Position Sensor G, Vehicle Bus Wiring
Related codes
- U0685Lost Communication With Catalyst Temperature Bank 1 Sensor 2
- U0686Lost Communication With Catalyst Temperature Bank 2 Sensor 1
- U0687Lost Communication With Catalyst Temperature Bank 2 Sensor 2
- U0689Lost Communication With Turbocharger/Supercharger B Temperature Sensor
- U068ALost Communication With Barometric Pressure Sensor C
- U068BLost Communication With Turbocharger/Supercharger Inlet Pressure Sensor A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.