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GTECH Calibration
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P1480

Cooling Fan 1 Control Circuit High.

  • Chrysler
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
4
AreaAuxiliary emission controls
80
FaultThe specific fault in that area

What it means

P1480 on a Chrysler means the powertrain control module has detected a high voltage on the cooling fan 1 control circuit. The module monitors the circuit that drives the fan relay or fan control module, and it saw a voltage or state that did not match what it commanded. How the fan is driven (a relay or a module, and the circuit layout) depends on the model and engine.

Symptoms

  • Engine cooling fan not running, or running constantly
  • Engine temperature rising in traffic or when idling
  • Air conditioning performing poorly at idle or in slow traffic
  • Engine warning light on
  • Temperature gauge reading higher than normal

Possible causes

  • Faulty cooling fan relay (contacts or coil stuck or failed)likely
  • Damaged wiring, chafing or a short to voltage on the fan control circuitlikely
  • Corroded, loose or damaged connector terminals at the relay, fan or powertrain control modulelikely
  • Failed fan motor or fan control module drawing or pulling the circuit abnormallypossible
  • Poor power or ground supply to the fan circuit, or a blown fusepossible
  • Fault inside the powertrain control module driver circuitrare

How to diagnose

  1. Read all stored and pending codes and the freeze frame data, noting coolant temperature and whether the fan was commanded on or off.
  2. Check the coolant level and look for other cooling faults, then check that the fan can be turned by hand with the ignition off.
  3. Inspect the fan relay, fuses, wiring and connectors for heat damage, chafing, water ingress and corrosion.
  4. Use a scan tool to command the fan on and off and check that it responds, and listen for the relay clicking.
  5. Swap the fan relay with a known good identical one, or test it on the bench, if the circuit layout allows.
  6. With a multimeter, check the control circuit voltage at the relay or fan module in both the commanded-on and commanded-off states, against the wiring diagram for that model.
  7. Check the power and ground supplies to the relay and fan for voltage drop under load.
  8. Test the fan motor current draw and the circuit for a short to voltage or an open circuit before suspecting the control module.

How to fix

  • Replace the cooling fan relay if it fails testing.
  • Repair or replace damaged wiring, and clean or replace corroded connector terminals.
  • Replace the cooling fan motor or fan control module if it is faulty.
  • Restore the correct power and ground supplies, and replace any blown fuse once the cause of the overload is found.
  • Replace or repair the powertrain control module only after the wiring, relay and fan have all been proven good.

Can I keep driving?

Medium severity

Short, careful trips are possible if the temperature stays normal, but the fan may not cool the engine in traffic. Do not carry on if the temperature gauge climbs, because overheating can cause serious engine damage.

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

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