P0694Generic code

P0694 Code: Fan 2 Control Circuit High

The P0694 code means the control circuit of cooling fan 2 shows high voltage, which points to an open circuit or a short to voltage. It can cause weak cooling in hot weather or under load. Check the fuse, relay, connector and wiring before replacing any part.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$30 to $500
Difficulty
Medium
System
Computer and Outputs
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0694 code means

Many vehicles have two fans or a two-speed fan, and the computer controls them separately based on temperature and A/C use.

The computer watches the control circuit from its own driver transistor. The P0694 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 second fan fails, cooling may still be enough in normal conditions, but not in hot weather, under heavy load or with the A/C on.

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.

P0694 code symptoms

  • Check engine light or another warning light on.
  • Not enough cooling in hot weather or under load.
  • High temperature in hot weather or with the A/C running.

Likely causes of the P0694 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 P0694 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 P0694 code

  • Repair the connector, the wiring or the power supply.
  • Replace cooling fan 2 if it does not respond when it has correct power and a correct control signal.
  • Clear the P0694 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 reports this code as common on GM and Chrysler vehicles. The same fuse, relay, connector and wiring checks apply on both.

P0694 on GM

Common on GM. Check the fuse, relay and connector before replacing the fan.

P0694 on Chrysler

Common on Chrysler. Follow the same checks of the supply, the control wire and the fan itself.

Frequently asked questions about P0694

What does the P0694 code mean?
It means the control circuit of cooling fan 2 has high voltage. The cause is an open circuit or a short to voltage.
Can I drive with a P0694 code?
Only with caution. The engine can run hotter than it should, especially in slow traffic or hot weather, so watch the temperature gauge and get it checked soon.
What does cooling fan 2 do?
Many vehicles have two fans or two speeds, and the computer controls them separately based on temperature and A/C use.
Do I always have to replace the part?
No. Check the fuses, relays, connectors and wiring first, because they cause most of these codes and cost very little to fix.
How much does it cost to fix P0694?
As a rough guide, between $30 and $500, depending on whether it is a fuse, a relay, a wiring repair or a new fan.

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Questions about the P0694 code

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