P0696
UniversalFan 3 Control Circuit High indicates that the Powertrain Control Module (PCM) has detected a higher than expected voltage within the control circuit for cooling fan 3. This condition often points to an open circuit, a short to voltage, or a fault within the fan control module or relay.
High SeverityThe P0696 code signifies an electrical issue in the control circuit for the cooling fan 3, leading to its inability to operate correctly. This can cause the engine to overheat, especially in stop-and-go traffic or during hot weather, potentially leading to severe engine damage if not addressed.
⚠️ Before You Begin (Safety First)
Always allow the engine to cool completely before working on the cooling system components. Be aware that the cooling fans can activate unexpectedly, even with the engine off. Disconnect the battery before performing any diagnostic or repair work on electrical circuits to prevent accidental injury or damage.
Common Symptoms
- Check Engine Light illuminated
- Engine overheating
- Cooling fan 3 not operating
- AC system not cooling efficiently (if fan assists AC condenser)
- Reduced engine performance (due to limp mode from overheating)
Common Causes
- Faulty cooling fan 3 relay
- Open or short circuit in the cooling fan 3 control wire
- Damaged cooling fan 3 motor
- Faulty cooling fan control module
- Corroded electrical connectors
- Faulty Powertrain Control Module (PCM)
Frequently reported on: General/Universal
Diagnostic Steps
- Safely park the vehicle and allow the engine to cool completely.
- Locate the fuse box (usually under the hood or in the dashboard) and check the fuse for cooling fan 3. Replace if blown.
- Locate the cooling fan 3 relay and swap it with a known good relay of the same type (e.g., another fan relay or horn relay) to test if it is faulty.
- Visually inspect the wiring and connectors leading to cooling fan 3 for any signs of damage, corrosion, or loose connections.
- With a multimeter, check for proper voltage and ground at the cooling fan 3 connector (refer to your vehicle's service manual for specific values and pinouts).
- If voltage and ground are present but the fan does not operate, the cooling fan 3 motor itself may be faulty.
👨🔧 When to Call a Professional
If basic checks of fuses, relays, and wiring do not resolve the issue, or if you are uncomfortable performing electrical diagnostic procedures, it is best to consult a professional technician. Complex wiring issues or PCM diagnostics require specialized tools and expertise.
Commonly Asked Questions
Can I drive with a P0696 code?
It is not recommended to drive for extended periods with a P0696 code, especially in warm weather or stop-and-go traffic, as it can lead to engine overheating and severe damage.
What is the difference between a high and low circuit code for the fan?
A 'high' circuit code (like P0696) typically means there is too much voltage or an open circuit, while a 'low' circuit code usually indicates insufficient voltage or a short to ground. Both prevent the fan from working correctly.
Is Fan 3 always the primary cooling fan?
Not necessarily. Vehicles can have multiple cooling fans. Fan 3 could be a secondary fan, an auxiliary fan for the AC condenser, or part of a multi-speed primary fan system.
How do I test the cooling fan relay?
You can test a relay by applying power and ground to its control terminals and checking for continuity across its load terminals, or by swapping it with a known good relay of the same type in the fuse box.
Could a P0696 code be caused by a bad fuse?
Yes, a blown fuse for the cooling fan circuit can cause a 'high circuit' reading if it creates an open circuit, preventing proper current flow and control.