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DTC codes / Jaguar codes / P1476

P1476 · JaguarFan Relay High Circuit

P1476 on a Jaguar means the engine control module (ECM) has detected an abnormally high voltage condition on the cooling fan relay control circuit, indicating the relay coil or its wiring is drawing too little current or the control line is shorted to power. The ECM commands the fan relay on and monitors the circuit for expected voltage feedback; when the voltage stays higher than expected, it flags this fault and may default the cooling fan to a fail-safe always-on strategy.

SystemPowertrain
Code typeJaguar specific
SeverityMedium
Fix difficultyIntermediate
AreaAuxiliary emission controls

Symptoms you may notice

  • The cooling fan may run continuously even with the engine cold and the key off, draining the battery.
  • The engine temperature gauge may climb above normal in traffic because the fan does not engage when commanded.
  • A check engine light (malfunction indicator lamp) is illuminated on the instrument cluster.
  • The air conditioning may blow warm at idle because the condenser fan is not being requested.
  • Often no symptoms besides the warning light, especially if the fault is intermittent and the fan still operates normally.
  • Possible low-speed fan operation only, with high-speed fan request failing when coolant temperature rises.

Common causes, most likely first

  1. Failed cooling fan relay with an open or high-resistance coil winding.
  2. Corroded, loose, or pushed-back terminal in the fan relay connector or the relay socket.
  3. Open circuit or high resistance in the control wire between the ECM and the fan relay coil.
  4. Short to battery voltage on the fan relay control circuit, often from a chafed harness near the fan shroud or radiator support.
  5. Faulty ECM driver for the fan relay control circuit, though this is less common than wiring or relay faults.
  6. Aftermarket or incorrect relay fitted that does not match the Jaguar coil resistance specification.
  7. Water intrusion into the relay box or fan control module causing intermittent high-voltage feedback.

How to diagnose and fix it

  1. Verify the fault is current by clearing the code and running the engine with the A/C on to command the fan, then recheck for P1476.
  2. Inspect the cooling fan relay, its socket, and the surrounding relay box for corrosion, water damage, or loose terminals.
  3. Swap the fan relay with an identical known-good relay from the same box and retest the circuit.
  4. Measure resistance across the relay coil and compare to the Jaguar specification; an open or out-of-range coil confirms a failed relay.
  5. Back-probe the relay control wire at the ECM and at the relay socket to check for a short to battery voltage with the key on and engine off.
  6. Load-test the control circuit with a test lamp or relay simulator to confirm the ECM can pull the circuit low and energize the relay.
  7. If the control wire is shorted, trace the harness from the ECM to the relay box, repairing any chafed or pinched sections near the fan shroud and radiator support.

Fan relay faults that mimic other codes

  • A fan relay with a partially open coil can still click audibly when commanded, so listening for the relay is not a reliable test; always measure coil resistance and circuit voltage.
  • P1476 is often set by a short to power on the control wire rather than a failed relay, and this short can be caused by coolant wicking through the harness or chafing against the fan shroud.
  • On some Jaguar models the fan relay is controlled by a ground-side driver in the ECM, so a short to voltage on the control wire will set this code even though the relay itself is good.
  • Intermittent P1476 that appears only in wet weather points to water ingress at the relay box or a rubbed harness behind the front bumper, not to a failing ECM.
  • Replacing the ECM for P1476 without first checking the relay coil and control wire resistance is a common and expensive misdiagnosis.

Can I keep driving with P1476?

You can drive the car to a workshop, but keep an eye on the temperature gauge and avoid heavy traffic or long idles until the fault is repaired. If the fan runs continuously, the battery may drain overnight, so park where a jump start is possible or disconnect the battery if the car will sit for days.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Jaguar vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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