This code means the TCM (Transmission Control Module) or ECM is receiving an invalid, erratic, or out-of-range signal from the engine speed input sensor (often the crankshaft position sensor or input/turbine speed sensor, depending on the vehicle). The sensor data is crucial for transmission shift timing and torque converter operation.
1. Faulty engine speed sensor (crankshaft position sensor or input speed sensor)
2. Loose, damaged, or corroded wiring/connectors in the sensor circuit
3. Faulty reluctor ring / tone wheel (missing, damaged teeth)
4. Signal interference (electrical noise)
5. Faulty ECM/TCM (rare)
1. Harsh or delayed gear shifting
2. Transmission stuck in limp mode
3. Tachometer not working or fluctuating
4. Engine stalling or hesitation
5. Check Engine Light ON
1. Inspect and test the engine speed sensor (resistance, voltage, waveform).
2. Check wiring/connectors for corrosion, loose pins, or damage.
3. Inspect the reluctor ring / tone wheel for damage or misalignment.
4. Replace faulty sensor if necessary.
5. Clear codes and perform a road test.
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