Faulty fan 2 relay or relay coil shorted; Control wire chafed or shorted to ground; Corroded, damaged or loose connector at the relay, fan or control unit; Failed fan motor or integrated fan control module drawing excess current or pulling the circuit low; Blown fuse or fault in the power supply to the fan circuit causing a false low reading; Internal fault in the engine control unit driver.

P0693

Fan 2 Control Circuit Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
6: AreaComputer and output circuits
93: FaultThe specific fault in that area

What it means

P0693 means the control unit has found a low voltage or a short to ground on the control circuit for cooling fan 2. The module commands the fan relay or fan driver and monitors the circuit. When the voltage it reads does not match what it commanded, it sets the code. The exact fan layout and how fan 2 is controlled depend on the vehicle.

Symptoms

Engine temperature rising in traffic or at idle
Cooling fan not running, or running constantly at full speed
Air conditioning performing poorly or cutting out at idle
Engine warning light on
Possible reduced power or limp mode on some models

Possible causes

Faulty fan 2 relay or relay coil shortedlikely
Control wire chafed or shorted to groundlikely
Corroded, damaged or loose connector at the relay, fan or control unitlikely
Failed fan motor or integrated fan control module drawing excess current or pulling the circuit lowpossible
Blown fuse or fault in the power supply to the fan circuit causing a false low readingpossible
Internal fault in the engine control unit driverrare

How to diagnose

Read all stored codes and freeze frame data, noting engine temperature, speed and whether the air conditioning was on when the code set.
Check the relevant fuses and the fan 2 relay, and inspect them for heat damage or corrosion.
Inspect the fan wiring, connectors and harness routing for chafing, water ingress, melted insulation or poor pin tension.
Using the manufacturer's wiring diagram, identify the fan 2 control circuit and relay arrangement for this model.
Operate the fan using a bidirectional scan tool command and check whether the fan and relay respond.
Measure the control circuit voltage at the relay or fan connector with the circuit active and inactive, and check for a short to ground with the connector unplugged.
Swap the relay with a known good identical one, or test it on the bench, and check the fan motor current draw and condition.
If the wiring, relay and fan are all sound, check the control unit's power and ground supplies before suspecting the unit itself.

How to fix

Replace a faulty fan relay with the correct specification part.
Repair or replace damaged wiring and secure the harness away from sharp edges and heat.
Clean or replace corroded or damaged connectors and terminals.
Replace a failed fan motor or fan control module as diagnosed.
Replace any blown fuse only after finding what caused it to blow.
Repair or replace the control unit only once all external causes have been ruled out.

Can I keep driving?

Medium severity

Short, gentle journeys are possible if the temperature gauge stays normal, but avoid traffic and long idling. If the engine temperature rises, stop and let it cool, because overheating can cause serious engine damage.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.