Opel Signum:  Clutch Slipping → Diagnosis

Your Opel Signum’s clutch provides a direct connection between the engine and transmission.  Without it, it can’t move at all. This connection requires a tremendous amount of pressure.  This guide is intended to help you determine why your clutch is slipping on the flywheel. Note:  This article is for manual cars only.  Here’s the automatic … Read more

Opel Signum:  Engine Sputtering (Causes + Diagnosis)

A sputtering engine can indicate a number of problems.  If your Opel Signum has a sputter, it is most likely going to be caused by bad fuel system, ignition system, MAF sensor, or bad catalytic converter.  Your Signum’s engine is a giant pump.  It pulls in air (where it is measured by the mass airflow … Read more

Opel Signum:  Brake Pedal Going to Floor Diagnosis

The single most important safety feature in your Opel Signum is a good set of brakes.  If your brake pedal is going to the floor, it indicates that there is a serious problem in the braking system.  When the pedal goes to the floor, it’s usually caused by a bad master cylinder, leaking brakes, bad … Read more

Opel Signum:  Hard Shift Diagnosis

One of the most common automatic transmission problems is shifting hard.  If your Opel Signum has a hard shifting transmission is not only can be uncomfortable to drive, it can be a sign of some serious problems.   Transmission Shifting Hard Diagnosis:  Opel Signum Here is a list of practical things that most people can … Read more

Opel Signum: Battery Saver Active → Diagnosis

Many modern GM made vehicles have a battery saver feature, this includes the Opel Signum.  If you are getting a “battery saver active” message, it means that your Signum’s electrical system voltage has dropped to a critical level (less than 11.7 volts).  Typical electrical systems run at 13+ volts with the engine running.  The battery … Read more

Opel Signum:  Warped Rotors → Symptoms & Causes

  Rotors are metal discs that are visible behind the Signum’s wheel. They work together with the calipers and brake pads to slow down your Opel Signum. Due to braking friction, rotors have to withstand and dissipate a tremendous amount of heat. This causes the rotor surface to be uneven making the brake pedal feel … Read more

Opel Signum: Bad Motor Mount → Symptoms + Diagnosis

While your Opel Signum’s engine mounts can last the life of the entire vehicle, it is possible that they will go bad.  Vibration and a clunking sound are the two most noticeable symptoms when driving the vehicle.  There are plenty of visible signs as well. Engine mounts connect the engine to the frame of the … Read more

Opel Signum:  Bad ECM → Symptoms + Diagnosis

Your Opel Signum’s ECM (Engine Control Module) is its brain.  Just like a human’s brain, your Signum can’t function without it. It is sometimes referred to as the ECU or PCM.  It’s all the same thing. The ECM controls and directs your entire drivetrain (unless there is a serrate transmission controller). When an ECM starts … Read more