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U1239 Engine Trouble Code

U1239 Engine

When you check engine light came on code U1239 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 U1239 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on our car models.

U1239 if your catalytic convertor fails completely, you eventually won't be able to keep the car running. Your gas mileage will also be terrible, so you should try and fix it as soon as you can. Unfortunately, the average replacement cost is around $2,000 and you can't do it yourself unless you're an experienced mechanic.

U1239 Code Meaning :

U 1 2 3 9
OBD-II Diagnostic Network (U) Trouble Code For Engine Fuel And Air Metering Ambient Air Temperature Sensor Circuit Low Cold Start Injector 1 Malfunction Ignition Coil A Primary/Secondary Circuit Malfunction

Is the fuel pump sometimes not priming when you turn the key to ON(II)? Start by measuring the fuel pressure and checking whether you have bright white-bluish spark at all four plugs. The mechanical timing is also something that you should check, as we mentioned above.

U1239 OBD-II Diagnostic Network (U) Trouble Code Description

U1239 engine trouble code is about Ignition Coil A Primary/Secondary Circuit Malfunction.

Reason For U1239 Code

The reason of U1239 OBD-II Engine Trouble Code is Ambient Air Temperature Sensor Circuit Low.

U1239 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.