What does code P1121 mean on Kia vehicles?
The TCM receives an invalid throttle position sensor signal from the ECM.
OBD-II Code Kia
P1121 — Kia — Throttle Position Sensor Signal Malfunction ECM to TCM
The TCM receives an invalid throttle position sensor signal from the ECM.
Common symptoms
- Protection mode
- poor throttle response
Possible causes
- Faulty TPS
- wiring issues
- ECM malfunction
Initial recommendation
Perform TPS diagnostics and inspect wiring between ECM and TCM.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine Kia code P1121 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more brands