P0696 Code: Fan 3 Control Circuit High

What the P0696 code means

Some vehicles use a third fan circuit for maximum speed or for an additional fan.

The computer watches the control circuit from its own driver transistor. The P0696 code tells you the voltage in that circuit is high, which means an open circuit or a short to voltage. Before you replace any part, check the fuse, the relay, the connector and the wiring, because those are the most common causes.

If it fails, cooling may not be enough in demanding conditions such as extreme heat or towing.

To confirm the fault, measure the continuity of each wire between the fan connector and the computer connector with the key off. It should be under 1 ohm, and an infinite reading means the wire is open. If the wiring checks out, measure the fan motor or relay itself: an infinite resistance confirms it is open inside.

P0696 code symptoms

• Check engine light or another warning light on.
• Not enough cooling in demanding conditions.
• High temperature in demanding conditions.

Likely causes of the P0696 code

1. Loose or broken connector. The most frequent cause, especially after another repair.
2. Open fan motor or relay coil. The resistance reads infinite.
3. Cut control wire between the fan and the computer.
4. Short to 12 volts. The control wire touches another wire that carries voltage.

How to diagnose the P0696 code step by step

1. Command the fan with the scan tool and check whether it responds.
2. Check the fuse and the relay. Measure voltage on both sides of the fuse, and swap the relay with an identical one.
3. Measure the supply at the connector. You should see battery voltage with the key on or when the fan is commanded.
4. Measure the fan resistance and compare it with the manual. Also check the insulation to ground.
5. Check the control wire for continuity all the way to the computer and for any short circuits.

How to fix the P0696 code

• Repair the connector, the wiring or the power supply.
• Replace cooling fan 3 if it does not respond when it has correct power and a correct control signal.
• Clear the P0696 code and verify the repair with a test drive and a check that the fan turns on.

Technical reference data

• Typical current draw: 10 to 30 amps.
• Reference values only: check the manufacturer data for your vehicle.

Brand-specific notes

The source describes this code as uncommon, but it does show up on some GM and Chrysler vehicles. The same fuse, relay, connector and wiring checks apply.

P0696 on GM

Uncommon, but it appears on some GM vehicles. Check the fuse, relay and connector before replacing the fan.

P0696 on Chrysler

Uncommon, but it appears on some Chrysler vehicles. Follow the same checks of the supply, the control wire and the fan itself.

Frequently asked questions about P0696