Code P0696 indicates that the engine control module has detected an abnormally high voltage in the control circuit for the third electric cooling fan. This typically points to a short to power, an open circuit, or a failed component that prevents the PCM from properly managing the fan.
A short to voltage, chafed wire, or open circuit in the fan control wiring is the most common cause of this high voltage condition.
A failed or internally shorted relay can feed abnormal voltage back through the control circuit to the PCM.
An internal short or failure within the fan motor itself can disrupt the expected circuit resistance and trigger the code.
Poor electrical connections at the fan, relay, or PCM can cause voltage irregularities that set the code.
A failed internal driver in the engine computer is possible but extremely rare, and should only be suspected after all wiring and components are proven good.
It depends on whether the cooling fan is functioning. If the engine runs at normal temperature, short trips are possible, but if the fan is inoperative, driving risks engine overheating and severe damage.
Almost never. While a failed PCM can theoretically cause this, mechanics frequently see drivers misdiagnosed and told to replace the computer. The actual culprit is almost always a wiring issue, a bad relay, or a faulty fan motor.
It refers to a third electric cooling fan on vehicles equipped with multiple fans, or it can refer to the high-speed control circuit on a multi-speed fan system.
Yes. If a relay fails internally and shorts to power, or creates a feedback loop, it can send an unexpected high voltage signal back through the control circuit to the PCM, triggering the code.