DTCs Archives - UnderhoodService
Ford- Illuminated MIL/Engine Coolant Over Temperature Warning

This may be caused by the engine coolant temperature (ECT) sensor or knock sensor wiring harness.

PCV System DTC

PCV systems are far more complex now, but they are also much better at controlling crankcase pressure.

GM Diagnostic Tip on Misfires, Noises and DTCs

Determine which description best matches the vehicle you are working on, and perform the suggestions as necessary.

Subaru Oil Temperature Lamp Flashing, Multiple DTCs

If you encounter a Subaru that has the oil temperature warning lamp flashing with a code stored in memory and possibly an intermittent stalling condition, it may be the result of contamination in the valve body.

Ignition System: MIL On, Ignition Coil DTCs Set

Some 2006 Zephyr; 2006-2008 Fusion and Milan; 2007-2008 MKZ, Edge and MKX; and 2008 Taurus, Taurus X and Sable vehicles built on or before March 1, 2008 and equipped with a 3.0L or 3.5L engine may exhibit a malfunction indicator lamp (MIL) on.

Diagnostic Dilemma: The Case of the Missing Code

When doing mobile diagnostic work, no-code stalling complaints are a major part of your agenda. In most cases, the client shop is simply too busy to duplicate the failure or, in some cases, a long test drive will yield nothing in the way of useful scan tool data. With many no-code stalls, all you’re going

No code stalling Chevy Tahoe
Ford: Driveability issues due to water in the PCM

Some 1999-2003 Windstar and 2004-’07 Freestar /Monterey vehicles built prior to June 22, 2006, may exhibit engine/transmission driveability issues due to water entering the powertrain control module (PCM) or transaxle vent. The water leakage may be due to the PCM connector cover not seating completely and water leaking down from the cowl panel grille (cowl

Ford Taurus PCM