P0692 Code: Fan 1 Control Circuit High

What the P0692 code means

The computer turns the radiator fan on through relays or a control module when coolant temperature climbs or the air conditioning is running.

The computer watches the control circuit from its own driver transistor. The P0692 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 the fan does not work, the engine overheats in slow traffic and the A/C blows weak at a standstill. Keep an eye on the temperature gauge until the repair is done.

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.

P0692 code symptoms

• Check engine light or another warning light on.
• Overheating in slow traffic.
• Temperature climbing in traffic or when stopped.
• A/C that cools poorly at a standstill.

Likely causes of the P0692 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 P0692 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 P0692 code

• Repair the connector, the wiring or the power supply.
• Replace cooling fan 1 if it does not respond when it has correct power and a correct control signal.
• Clear the P0692 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

On many vehicles the two-speed fan uses resistors or a PWM module, so the circuit layout varies from one model to the next. Look up the wiring diagram for your vehicle before you probe anything.

Frequently asked questions about P0692