Knowing the most common faults makes it easier to repair the car yourself.
С1201
In this case, the system considers the operation of the engine incorrect. RPMs of the motor are unable to reach normal values. If code C1201 is detected, you need to check the idle speed controllers and shafts.
When error C1201 is detected, the engine does not run correctly.
The problem may also be in the power train, such as a damaged gasket or head block.
C1223
Indicates ABS malfunction. Check the control module.
С1241
Occurs when there is an abnormal voltage measured at the auxiliary battery current outputs. The controllers signal in this case does not correspond to the standard parameters.
С1280
Indicates an open circuit in the electric circuits. This fault occurs if the control module is faulty.
С1298
This combination is displayed in case of malfunction in the pressure regulator solenoids. If the unit is defective, look for the cause in the wiring or in the all-wheel drive control unit.
С1441
It is deciphered as "low braking system performance". The fault should be looked for in the directional stability module (its booster component).
Error C1441 means low brake performance.
C1299
Indicates a failure of the four-wheel drive control system. The problem is looked for in the clutch system and the transmission itself. It may occur in case of transmission sensor or torque converter failure.
B279a
The code is displayed when the communication between the control unit and the ECM module is broken. The cause of the error is battery discharge.
Less frequently the fault is related to voltage fluctuations.
В1421
This combination indicates a problem with the sunshine controller. The part is on the front passenger side.
В2799
The appearance of the code is due to:
Disruption of communication between the control unit, engine, and ID code module. Check the wiring harness connecting these components thoroughly.
Open circuit in electrical system. You need to diagnose ECM unit. Pay attention to the integrity of the cables.
Discrepancy of identification data detected during data transmission from ECM. This module shall be diagnosed.
U011b
On some vehicles, this combination of symbols is detected when communication with the control system of the valve actuator lever is interrupted.
The unit may have detected a lack of communication with the digital CAN bus.
Р0012
The number indicates a malfunction of the timing gear regulator. It occurs due to a drop in the fluid level in the powertrain.
P0012 indicates a malfunction of the timing gear.
Less commonly, it is caused by improper installation of the camshaft, timing belt, or phase controller actuator. You need to check:
Timing system magnetic valve filters. Parts may be dirty or damaged.
Fluid leakage near timing gear seating surfaces.
Discontinued fluid supply to the timing gear.
Timing belt for signs of wear.
Р0037
The main cause of this code is a failure in continuity of the cable connected to the oxygen controller heater element.
The control system detects deterioration of the signal coming from the sensor.
The malfunction occurs due to:
failure of the heater element;
failure of the lambda probe fuse;
Failure of wiring integrity, short circuit in the circuit;
oxidation of the contact in the power supply block;
ECM unit malfunction.
Р0138
Occurs due to increased pulse passing through the oxygen regulator circuit. Check the part located in 1 bank.
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P0138 indicates oxygen regulator pulse increase.
Р0171
Indicates the depletion of the fuel-air mixture in the cylinders. First of all, check the compression of the engine.
The sensors of air consumption and oxygen controller influencing the mixture formation are also subject to diagnostics.
P0420
Indicates a decreased efficiency of the catalytic converter, the problem should be looked for in 1 bank. Signs of the breakdown occur 5 minutes after the engine is started. Oxygen controller heating system is to be repaired in this case.
P0627 on Diesel
The code indicates a fuel pump circuit failure. Wires, contacts, relays need to be inspected.
Error 41
Throttle control is sending the wrong signal. Check the mechanism itself and the cables connected to it.
P264a
Damaged wiring or the pads are disconnected from the actuator regulator. This refers to the components located in the first row.
If the wiring is damaged, you will see error P264a.
P1047
In this case the Valvematic unit is defective.
The microprocessor detects an error made during the adjustment of the module. The problem is caused by a break in the first row wiring.
Р1049
Indicates that the Valvematic unit parameters are incorrectly entered. Less commonly, this code detects a short circuit.
Р1155
Indicates incorrect operation of lambda probe 2. Failure occurs due to breakdown of wiring insulation or contamination of the terminals.
P1603
The combination reflects malfunction of the EEEPROM module. It is impossible to do without a thorough diagnosis of the processor.
P1604
Causes of the error are:
Battery damage or discharge;
Malfunction of ignition system;
Filling with low-quality fuel;
malfunction of the immobilizer;
malfunction of anti-theft system;
critical engine breakdowns;
clogging of filters, which are engaged at startup;
failure of injectors.
The cause of the error P1604 is battery discharge.
Р1605
This combination indicates receiving incorrect idle speed data. The problem occurs due to a variety of causes, such as ECU or cylinder failure.
Most often a failure of the detonation controller is detected.
Р1589
The code appears when:
improper calibration of the deceleration sensor position;
SRS system malfunction;
unstabilized position of the vehicle during calibration;
The control unit does not work correctly.
Р1750
Indicates brake system malfunction. Inspect the stability mechanism or ABS module.
Р2195
Indicates fuel mixture depletion. The problem is related to the data sent by the 1st row oxygen sensor.
P2238
In this case, a lambda probe inspection is required. The signal sent by the regulator is too weak.
If you see error P2238, check the lambda probe.
Р2646
Indicates that the valve actuator is jammed when the engine is turned off. Other problems in the operation of this system are less often detected. It is necessary to thoroughly diagnose the unit.
Awd error
The code indicates the need to check the all-wheel drive.
It is accompanied by wheel slippage, spontaneously disappears after a few hours. If this does not happen, a scanner check is needed.
Charge the battery
The message appears not only when the battery is discharged. Sometimes diode bridge failure is detected. It needs to be replaced.
4wd
The main reason is considered the installation of wheels of different brands or sizes. The error does not cause problems, it disappears when the car is restarted.
Installing different brands of wheels causes the 4wd error.
However, you should not postpone replacing wheels with the same ones. The engine is sensitive to such moments.
ABS error
In this case, the corresponding lamp lights up. The cause is sought in the breakdown of wiring or controller failure.
Airbag malfunction
It is associated with a damaged loop or cable in the steering column. In some vehicles, this combination appears when the airbag is triggered.
4lo
Indicates failure of transmission actuation system. It is necessary to carefully inspect all connectors and sensors. The problem lies in the incorrect functioning of the inter-axle differential locker.
TRS error
The code does not indicate a malfunction. This is how the system reacts to the installation of an alarm or additional immobilizer. Resetting the error is helped by a slight delay in turning on the ignition.
How to reset errors on Toyota Rav 4
The fault is erased from the system memory in the following way:
Activate the ignition. Short-circuit contacts E1 and TC, located on the diagnostic block.
Press brake pedal 8 times for 3 seconds. Wait until the LED lights up.
Deactivate the ignition and open the pins.
The CHECK-LED will go out as soon as the error is cleared.
