P0127 Code:

OBD-II Diagnostic Powertrain (P) Trouble Code

Possible Cause

Common causes of P0127 include four-wheel drive switch or actuator failures. Other causes include faulty sensors, solenoids, or switches, and defective wiring harnesses and connectors.

Common Symptoms

  1. Pay close attention to areas where wiring and connectors are located near hot exhaust components
  2. Repair or replace any open, shorted, damaged, or corroded items as required and retest the system to make sure that repairs were successful
  3. CAN is the abbreviation for "controller area network." The CAN represents a communication bus that allows multiple microcontrollers to communicate with one another without the need for a host computer
  4. If either the reference voltage or ground circuits are open, use the digital volt/ohmmeter to check for continuity (disconnect all related control modules from the circuit before checking circuit resistance or controller damage may occur) and resistance in all circuits

Similar Problems

Transmission
Exhaust Gas Recirculation System Valve 1
PCM Stack Overrun

P0127 Troubleshooting

There will also be noise coming from the turning radiator fan and the belt that turn the fan blade. There are a multiple of other belt driven devices under the hood. An engine pulley is mounted to the engine of an automobile and drives all belts. Your car probably has a serpentine belt which is a continuous belt used to drive multiple peripheral devices. Parts or components should not be replaced with reference to only a P0127 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.

How to turn off P0127 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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