What does P1480 mean on a Chevy?

P1480. Cooling Fan 1 Control Circuit High. Applies to TrailBlazer, Envoy, Silverado, Impala, Malibu.

What causes P1480 on a Chevy?

Short to voltage on the Fan 1 relay control circuit Failed cooling fan relay in the underhood fuse block Chafed fan harness rubbing on the fan shroud or frame rail Faulty PCM fan driver holding the circuit high

How do I fix P1480 on a Chevy?

Inspect the fan harness routing for chafing before replacing any relay Test the Fan 1 relay by swapping with an identical relay and commanding the fan with a Tech2/GDS2 scan tool Check the control circuit for a short to battery voltage with a multimeter Verify PCM command state on the scan tool before condemning the module

Code

P1480

Cooling Fan 1 Control Circuit High

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: TrailBlazer, Envoy, Silverado, Impala, Malibu
Related: No single generic twin. See OBD Codes List

What it means

P1480. Cooling Fan 1 Control Circuit High. This Chevy-enhanced code applies to TrailBlazer, Envoy, Silverado, Impala, Malibu.

Findings, check these first

Short to voltage on the Fan 1 relay control circuit
Failed cooling fan relay in the underhood fuse block
Chafed fan harness rubbing on the fan shroud or frame rail
Faulty PCM fan driver holding the circuit high

Standard procedure

Inspect the fan harness routing for chafing before replacing any relay
Test the Fan 1 relay by swapping with an identical relay and commanding the fan with a Tech2/GDS2 scan tool
Check the control circuit for a short to battery voltage with a multimeter
Verify PCM command state on the scan tool before condemning the module

Look up another code

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Sources and review

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Last updated 2026-09-13.

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