U1145 Engine Error Code

When you check engine light came on code U1145 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However your vehicle's manufacturer may have a different definition for the U1145 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on your car models.

U1145 Code Symptoms

U1145 Code Reason

U1145 OBD 2 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.

Air Conditioning Pressure Sensor (ACP) Insufficient Pressure Change Each time the A/C clutch engages, the PCM is looking for a pressure change in the refrigerant. If the change in pressure is outside of the calibration the DTC will set. A/C system mechanical failure Open ACP or VREF circuit A/C sensor damaged A/C system electrical failure A/C clutch always engaged Verify A/C system function, including refrigerant charge.

U1145 OBD-II Diagnostic Network (U) Trouble Code Description

U1145 SCP (J1850) Invalid or Missing Data for Primary Id so you have to check ODB-II Engine Error Code list.

U1145 Code Review :

The reason of U1145 OBD-II Engine Error Code is U1145 SCP (J1850) Invalid or Missing Data for Primary Id.

U1145 Code Dictionary Meaning:

u - Network Code - Problem is climate control system, lighting, airbags, etc.
1 - MFG - Manufacturer Specific
1 - Fuel And Air Metering
4 - Control Module Throttle Actuator Position Performance
5 - Cruise Inhibit Control Circuit