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P0121

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK GEARBOX warning lamp on. TCM in limp-home mode.

P0121


Throttle Position. Signal Incorrect.


Fault symptoms

CHECK GEARBOX warning lamp on.

TCM in limp-home mode.

Conditions

The “Throttle Position” signal is absent or outside tolerances for more than 4 s.

Diagnostic help

The throttle position sensor can be read with the diagnostic tool.

Check the wiring

Jiggle the wiring harness at several points and in different directions to reveal intermittent breaks and short circuits in the various leads. Observe the multimeter, test lamp or diagnostic instrument while carrying out this check.