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P1438 Engine Trouble Code

Meaning of P1438 engine trouble code is : Theoretically you can drive for a few weeks or even months with a broken MAF sensor. You will notice a decrease in gas mileage and over time the car will eventually start stalling a lot. At a shop, the replacement cost is between $200-$300 depending on the car, but that's usually the cost of parts because the labor is relatively simple.

P1438 Possible Solution:

P1438 Engine

Power Steering Pressure (PSP) Switch Malfunction In Key On, Engine Off Self-Test, this DTC indicates the PSP input to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Steering wheel must be turned during Key On, Engine Running Self-Test PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged.

P1438 Code Meaning :

P 1 4 3 8
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine Fuel And Air Metering O2 Sensor Heater Circuit Malfunction Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector) Clutch Position Sensor Circuit Malfunction

The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue.

P1438 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P1438 OBD-II Trouble Code A/C Evaporator Air Temperature Circuit Range/Performance is one of the definitions for the P1438; however your vehicles manufacturer may have a different definition for the P1438 code. Please check be P1438 code.

Reason For P1438 Code

The reason of P1438 OBD-II Engine Trouble Code is O2 Sensor Heater Circuit Malfunction.

P1438 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.