Fan 1 Relay Control Circuit

Category

Powertrain - Computer and Auxiliary Controls

Severity

Check Engine Light

Applies to

Silverado, Sierra, Impala, Malibu, Equinox, Traverse

Related

No single generic twin. See OBD Codes List

Findings, check these first

• Failed Fan 1 relay with burned contacts in the underhood fuse block
• Open or shorted relay control circuit between the PCM and fuse block
• Seized cooling fan motor overloading the relay circuit
• Corroded fuse block terminals from moisture intrusion

Standard procedure

1. Swap the Fan 1 relay with an identical relay and command the fan with a Tech2/GDS2 scan tool
2. Test the fan motor by powering it directly before condemning the control circuit
3. Check the control circuit for opens and shorts with a multimeter
4. Inspect the underhood fuse block for corrosion or heat damage at the relay socket

Look up another code

Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.

Related Computer and Auxiliary Controls codes

• P1106Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
• P1107Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage
• P1108BARO To MAP Sensor Comparison Too High
• P1111Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage