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U1938 Engine Code Repair

Meaning of U1938 engine trouble code is a kind of network trouble code and U1938 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 $2,140 and you can't do it yourself unless you're an experienced mechanic.

U1938 Fault Symptoms :

  1. Check engine light comes on
  2. Engine stalling or misfiring
  3. Engine performance issues
  4. Car not starting

If one of these reasons for U1938 code is occuring now you should check U1938 repair processes.
Now don't ask yourself; What should you do with U1938 code ?
The solution is here :

U1938 Possible Solution:

U1938 Engine

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.

U1938 Code Meaning :

U
OBD-II Diagnostic Network (U) Trouble Code For Engine

1
Fuel And Air Metering

9
Engine Oil Temperature Sensor Malfunction

3
Turbocharger Boost Sensor A Circuit Low

8
Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical

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.

U1938 OBD-II Diagnostic Network (U) Trouble Code Description

U1938 engine trouble code is about Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical.

Main reason For U1938 Code

The reason of U1938 OBD-II Engine Trouble Code is Engine Oil Temperature Sensor Malfunction.

U1938 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.