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DTC codes / Jaguar codes / P1136

P1136 · JaguarControl Box Fan Circuit

P1136 on a Jaguar indicates that the engine control module (ECM) has detected a fault in the control box fan circuit, which is responsible for cooling the engine management electronics. The ECM monitors the fan's electrical circuit and sets this code when it sees an unexpected voltage, current draw, or open/short condition that prevents proper fan operation.

SystemPowertrain
Code typeJaguar specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • Illumination of the check engine light (malfunction indicator lamp) on the dashboard.
  • Often no symptoms besides the warning light, especially if the fan is not critical under normal driving conditions.
  • Possible engine performance issues or reduced power if the control box overheats and affects the ECM.
  • Fan may run continuously or not at all, which can be noticed by sound or lack thereof after engine shutdown.
  • In rare cases, the engine may stall or fail to start if the control box fan failure leads to ECM overheating.

Common causes, most likely first

  1. Failed control box cooling fan motor, which may seize or draw excessive current.
  2. Blown fuse or faulty relay in the control box fan circuit.
  3. Damaged wiring or corroded connectors between the ECM, fan, and power source.
  4. Faulty engine control module (ECM) internal driver for the fan circuit.
  5. Poor ground connection for the control box fan circuit.
  6. Water intrusion or corrosion in the control box area, damaging the fan or wiring.

How to diagnose and fix it

  1. Check the fuse and relay for the control box fan circuit and replace if blown or faulty.
  2. Inspect the fan motor and wiring for obvious damage, corrosion, or loose connections.
  3. Test the fan motor directly with 12 volts to see if it operates; replace if it does not.
  4. Measure resistance and voltage on the fan circuit to check for open or short circuits.
  5. Verify the ECM is commanding the fan on using a scan tool with bidirectional controls.
  6. If all else checks out, diagnose the ECM driver circuit or replace the ECM as a last resort.

Control Box Fan Circuit Quirks on Jaguars

  • The control box fan is often overlooked during routine maintenance, so a seized fan motor is a common cause that many technicians miss initially.
  • A faulty fan can cause the ECM to overheat, leading to intermittent driveability issues that may not set other codes.
  • Some Jaguar models use a pulse-width modulated (PWM) signal to control fan speed, so a failed fan module can set P1136 without blowing a fuse.
  • Corrosion in the control box connectors due to water leaks from the cowl area is a frequent hidden cause on older Jaguars.
  • P1136 can be set by a low battery or charging system issue that causes voltage spikes, so always check battery health first.

Can I keep driving with P1136?

You can generally drive with P1136, but avoid prolonged idling or heavy loads that increase underhood temperatures, as the control box fan may not be working. If the engine begins to run poorly or stall, stop driving and have the vehicle towed to a repair shop.

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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