P1288 code possible causes
- Faulty thermostat
- Overheated engine
- Low engine coolant level
- Defective cylinder head temperature sensor (CHT)
- Cylinder head temperature sensor wiring harness is open or short-circuited
- Poor electrical connection in the cylinder head temperature sensor circuit
How is P1288 code repair performed?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P1288 code technical notes
This indicates that the cylinder head temperature sensor (CHT) is outside the self-test range. The engine is not at normal operating temperature.
What are the possible symptoms of P1288 code?
- Check engine light on (or service engine soon warning light)
What does P1288 code mean?
The cylinder head temperature sensor (CHT) is mounted in the cylinder head wall and is not connected to any coolant passages. The CHT sends a signal to the powertrain control module (PCM) indicating the cylinder head temperature. If the temperature exceeds 126°C (258°F), the PCM shuts off four fuel injectors at a time. The PCM will alternate the four disabled injectors every 32 engine cycles. The four cylinders that are not injected with fuel act as air pumps to help cool the engine. If the temperature exceeds 154°C (310°F), the PCM shuts off all fuel injectors until the engine temperature drops below 154°C (310°F).