GM TRANSFER CASE NOISES Customer complaints involving howling, whining, shudder or grinding noises during parking lot maneuvers in Auto Mode or highway speeds in 4HI or Auto may occur on four wheel drive GM trucks and SUV vehicles. Vehicles affected range from 2014–2023 year models. Specific applications can be identified in GM Service Bulletin 19-NA-136. […]
Read More
Customer complaints of rough idle, misfires, crank but no start or long crank time symptoms can be a challenge with today’s technology. Random or multiple misfire codes may be stored in memory. Symptoms that seem like an ignition related issue may actually be fuel related, carbon induced, or in some cases a normal characteristic. Fuel […]
Read More
LOW FLUID LEVEL CAUSES POWER TRANSFER UNIT FAILURE Are you accurately checking those fluid levels and recommending fluid flushes or exchanges, where applicable? Unfortunately, many service technicians fall into a pattern of just performing lubrication services requested by the customer, which is usually triggered by a service reminder light indicating that it is time for […]
Read More
DODGE AND JEEP OIL FILTER IDENTIFICATION Precaution must be taken when selecting the correct oil filter for the 3.0L Turbo Diesel engines used in the following applications to prevent engine damage. The vehicle manufacturer cautions about the design differences in the GEN-2 and GEN-3 oil filter cartridges used in 3.0L diesel engines and the importance […]
Read More
The shop had performed a service on the customer’s 2015 Silverado equipped with a 6.6L Duramax Turbo Diesel, which included a fuel filter replacement. Weeks later the customer contacts the shop owner requesting re- imbursement in the amount of $14,000 to cover the repair cost of the fuel injection system due to an alleged defective […]
Read More
Determining if the performance symptom is due to the vapor pressure of the fuel, carbon buildup, or sticking valves due to gum and varnish can be a challenge.
Read More
Customer complaints of chirping, ticking, squealing, or squeaking sounds accompanied with misfire codes stored may be the result of valve lifter or camshaft failures on vehicles equipped with Active Fuel Management (AFM), sometimes referred to as Displacement on Demand (DOD). Pinpointing the source of the noise can be a challenge for the technician and the […]
Read More
Neglecting a Filter Replacement Can Be Costly While much emphasis is placed on servicing filters during routine vehicle maintenance, little attention is given to the fuel filter until an engine performance issue occurs. Neglecting the fuel filter can result in damage to some expensive components such as an electric fuel pump or some costly fuel […]
Read More