A bad PCM, or power train control module, has a check engine light that does not turn off, an assortment of random codes, intermediate stalling issues and poor engine performance. The power train control module monitors the drive train system.Know More
The power train control module and engine control module are sometimes confused for one another. The engine control module monitors the sensors found on the motor while the power train control module handles the drive train sensors.
A vehicle with a failing power train control module will not correctly interpret the readings from the engine's sensors. This results in the vehicle running rough with fuel cutoffs, accessory power failures and ignition issues. To repair a damaged power train control module, replace the unit.Learn more about Car Parts & Maintenance
A bad positive crankcase ventilation valve causes various symptoms, including ignition of the check engine light. Other symptoms include odd noises from the engine or oil on the air filter element.Full Answer >
Symptoms of a bad transfer case manifest themselves differently depending on the extent of damage within this important drive-line component. According to AAMCO, the most obvious sign of transfer case failure is the complete loss of four-wheel or all-wheel drive. Another sign of extensive damage to the transfer case is the inability to switch back to two-wheel drive from four- or all-wheel driving modes.Full Answer >
Symptoms of a bad ignition coil include backfiring, bad fuel economy, and stalling and starting issues. Before the ignition coil is replaced, the engine will need to be properly diagnosed to ensure it is the root of the problem.Full Answer >
The main symptom of a failed heater core in a car is a lack of heat from the heater or defroster. More condensation than usual on the windshield and damp floor mats can signify a blocked core. Orange or green drips from under the instrument panel indicate leaks.Full Answer >