P0696 — Cooling Fan 3 Control Circuit High

What P0696 means

P0696 is the standardized powertrain DTC for “Cooling Fan 3 Control Circuit High.” The code identifies the monitored condition; it does not by itself prove which part failed.

How to interpret the code wording

“Circuit High” means the module saw voltage or a signal above its calibrated range. Depending on circuit design, test for a short to voltage, an open/poor ground, an open signal circuit, terminal problems, or a failed sensor/actuator. Use the OEM wiring diagram because “high” does not identify the failed part by itself.

Possible symptoms

• Cooling fan runs constantly or does not run when commanded
• Engine temperature rises in traffic/idle
• A/C performance may degrade at low speed
• Check Engine Light

Causes to test

These are diagnostic possibilities, not a statistical parts-replacement ranking. Vehicle-specific service information takes priority.

• Fan motor or integrated fan-module fault
• Relay/control-module or PWM control fault
• Fuse, high-current power, ground, or connector problem
• Fan speed/feedback sensor fault where equipped
• Mechanical obstruction or damaged fan assembly

Step-by-step diagnostic workflow

1. If the engine is overheating, stop and correct the cooling problem before extended operation.
2. Use bidirectional controls when supported to command the fan through available speeds.
3. Check high-current power and ground under load; a no-load voltage check can miss resistance.
4. Inspect relays/modules/connectors and verify control/PWM signal.
5. For speed/rationality codes, compare commanded speed with actual feedback.
6. Clear codes only after repair, then complete an appropriate drive cycle and verify the code and symptoms do not return.

Scan data worth checking

• Commanded fan percentage/speed
• Actual fan speed where supported
• Engine coolant temperature
• A/C pressure
• System voltage

Severity and drivability

Moderate to high if engine temperature is rising or A/C pressure is excessive. An inoperative fan can lead to overheating at low vehicle speed.

Stop driving and investigate immediately if there is a flashing MIL, oil-pressure warning, overheating, fuel leakage, severe misfire, major loss of power, abnormal mechanical noise, or a transmission that is slipping badly.

Common diagnostic mistakes

• Replacing the fan motor without load-testing power and ground
• Assuming a constantly running fan means the fan itself is defective
• Working near an electric fan without accounting for automatic fan activation

Related generic codes