P0692
Fan 1 Control Circuit High
Powertrain Engine Cooling Fan Control Circuit 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

The engine's cooling fan circuit is stuck in the "on" position or the ECU detects abnormally high voltage. Think of it like a light switch that's jammed in the up position—the fan won't turn off when it should.

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Symptoms You May Notice
3 known symptoms for this code
Cooling fan runs continuously even when engine is cold
Battery drain or electrical noise from fan area
Engine overheating or inconsistent temperature readings
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECM monitors the voltage and current draw on the fan control circuit. It expects the control signal to toggle between ground and 12V based on coolant temperature. A "high" fault occurs when the voltage remains above threshold for longer than expected or the circuit shows shorted-to-power conditions.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Fan Control Signal Voltage 0-5V (PWM or relay ground) >10V or continuous 12V when fan should be off
Fan Control Circuit Current 0-15A during operation Continuous draw or circuit stuck high impedance
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Fan relay
Swap the cooling fan relay with another relay of the same part number to confirm if the relay is stuck closed.
2
Fan motor connector
Inspect and clean the fan motor connector for corrosion or loose pins causing high resistance.
3
Wiring harness and ECM connector
Check fan control circuit wiring for shorts to power, damaged insulation, or loose connections at the ECM.