What it means
Same as P0695 with the line shorted to supply or open. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
How it works
The controller monitors the control line for Fan 3, a third fan that may be used for auxiliary or condenser cooling. P0696 sets when the circuit voltage is higher than expected, which can occur if the line is open or shorted to supply and Fan 3 cannot be controlled as intended.
Common causes
Most likely first.
- Control line shorted to supply
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
Symptoms
- Cooling fan may not operate as commanded
- Engine or A/C condenser may overheat
How to diagnose it
- Record freeze-frame data and check coolant temperature, A/C request, and available Fan 3 command or status data to understand when the fault appears.
- Identify Fan 3 from the wiring information and inspect its connector and harness for an open connection, corrosion, pinched insulation, or contact with a power feed.
- Command Fan 3 with scan-tool output controls if available and observe whether it responds independently of the other fans.
- Check continuity of the Fan 3 control line and test for an unintended short to supply using the manufacturer's procedure.
- Test the Fan 3 relay or switching device and controller-side circuit according to the vehicle wiring diagram.
Common fixes
- Reconnect or secure a loose Fan 3 connector.
- Clean corroded terminals and restore proper connector contact.
- Repair an open Fan 3 control wire or wiring shorted to supply.
- Replace the Fan 3 relay or switching device if it fails the specified test.
Can I keep driving?
Limit driving and monitor the temperature gauge, especially in traffic or with the A/C on. Stop safely if the engine overheats, since reduced auxiliary fan operation can allow temperatures to rise.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.