P0693
Fan 2 Control Circuit Low
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 computer detected that cooling fan #2 isn't receiving proper electrical power or the circuit voltage dropped too low. It's like trying to turn on a light switch but the power isn't reaching the bulb.

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Symptoms You May Notice
3 known symptoms for this code
Engine running hotter than normal
Fan 2 not spinning or spinning intermittently
Check Engine Light illuminated
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECM monitors the control voltage signal sent to cooling fan relay #2, expecting a commanded high signal to activate the fan circuit. When the voltage drops below the minimum threshold or the circuit resistance indicates an open or short condition, the fault is triggered.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Fan 2 Control Voltage 12V when commanded on, 0V when off Below 10V or open circuit detected
Circuit Continuity Less than 5 ohms resistance Greater than 10 ohms or infinite resistance
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Fan 2 relay
Swap the relay with an identical one from another circuit to test if the relay is faulty.
2
Wiring harness and connectors
Inspect fan #2 connector and wiring for corrosion, loose connections, or damaged insulation and repair as needed.
3
Cooling fan motor #2
Test fan motor resistance with a multimeter; replace if open or shorted.