[SOLVED] P1289 Code: Cylinder Head Temperature Sensor Signal – Diagnosis And Fix

If you see the engine light or service engine soon warning light illuminated on your dashboard, it could be a sign of trouble. One possible fault code that could be causing this is P1289.

This fault code is typically associated with issues related to the engine’s temperature regulation.

The symptoms of this fault code include an overheating engine and a low coolant level. The causes can range from a faulty thermostat to a problem with the Cylinder Head Temperature (CHT) sensor or its wiring. To fix this issue, you should visually inspect the wiring harness and connectors, checking for any damage or corrosion.

It’s important to address this problem promptly as it can lead to further engine damage.

The repair for this fault code has a difficulty level of 1.0, meaning it is relatively easy to fix.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p1289 fault code.

  • The symptoms of the automobile fault code P1289 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The fault code P1289 can be caused by a range of issues, including a wrong thermostat, engine overheating, low engine coolant level, faulty CHT sensor, open or shorted CHT sensor harness, and poor electrical connection in the CHT sensor circuit.

  • The fault code P1289 can be caused by: a wrong thermostat, engine overheating, low engine coolant level, a faulty Cylinder Head Temperature (CHT) sensor, an open or shorted CHT sensor harness, or a poor electrical connection in the CHT sensor circuit.

To fix the automobile fault code p1289, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code P1289, you need to follow these steps: 1.
  • Check the possible causes mentioned above.
  • 2.
  • Visually inspect the wiring harness and connectors related to the fault code.
  • 3.
  • Look for any damaged components.
  • 4.
  • Check for broken, bent, pushed out, or corroded pins in the connectors.
  • 5.
  • Repairing this fault code is estimated to take approximately 1.0 hour.

The factors influencing the diagnosis and fixing cost of the automobile fault code P1289 are the estimated repair time and the hourly rate charged by auto repair shops. The estimated repair time for this fault code is 1.0 hour.

Auto repair shops typically charge between $75 and $150 per hour for their services.

These factors will determine the overall cost of diagnosing and fixing the P1289 fault code.

The P1289 fault code refers to the Cylinder Head Temperature (CHT) Sensor signal being greater than the self-test range. This sensor is located in the cylinder head and is responsible for sending a signal to the Powertrain Control Module (PCM) to indicate the temperature of the cylinder head. When the temperature exceeds 126°C (-258°F), the PCM disables four fuel injectors at a time.

This is done to prevent further overheating and damage to the engine. The PCM will alternate which four injectors are disabled every 32 engine cycles.

The four cylinders that are not being fuel injected act as air pumps to help cool the engine. If the temperature continues to rise and exceeds 154°C (310°F), the PCM will disable all of the fuel injectors until the engine temperature drops below 154°C (310°F). This is a safety measure to protect the engine from severe overheating. If you encounter the P1289 fault code, it is important to have the Cylinder Head Temperature Sensor checked and replaced if necessary. Ignoring this issue can lead to engine damage and potential breakdowns.

What are the possible causes of the automobile fault code P1289 and how can I visually inspect them?

If you’re seeing the engine light on or the service engine soon warning light, the fault code P1289 could be the culprit. This code can be caused by a few different things, including a wrong thermostat, engine overheating, low engine coolant level, a faulty Cylinder Head Temperature (CHT) sensor, or issues with the CHT sensor harness or circuit. To visually inspect these potential causes, check the wiring harness and connectors for any damage. Look out for broken, bent, pushed out, or corroded connector pins as well. Don’t forget to also examine any related components for any signs of damage.

How can I determine if the thermostat is the wrong one and causing the engine light to come on?

If you’re experiencing the dreaded engine light coming on, it could be due to a wrong thermostat. But how can you be sure? Look out for symptoms like engine overheating or low coolant level. Other possible causes include a faulty Cylinder Head Temperature (CHT) sensor or issues with the sensor’s harness or circuit. To fix this, visually inspect the wiring harness and connectors, checking for any damage or corrosion. Don’t forget to examine the connector’s pins for any signs of breakage, bending, or pushing out.

What steps should I take to fix the P1289 fault code if I find a poor electrical connection in the Cylinder Head Temperature (CHT) sensor circuit?

To fix the P1289 fault code caused by a poor electrical connection in the Cylinder Head Temperature (CHT) sensor circuit, start by visually inspecting the wiring harness and connectors. Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins. This will help identify and resolve any issues with the electrical connection. Don’t forget to also check the other possible causes listed above.

p1289 error fault code explained

If your engine light is on or you see a service engine soon warning light, it could be due to a P1289 fault code. This code can be caused by a wrong thermostat, engine overheating, low engine coolant level, faulty Cylinder Head Temperature (CHT) sensor, or issues with the CHT sensor harness or circuit.

To fix this, visually inspect the wiring harness and connectors, check for damaged components, and look for any broken, bent, pushed out, or corroded connector pins.

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