Code P0300?

TEE87

MEMBER
2010 CHEVROLET MALIBU
3.6L
V6
2WD
AUTOMATIC
198,000 MILES

Transmission recently replaced by a crap shop. Since picking up the vehicle I've been having nothing but problems that I originally didn't have. I had to replace the battery to start. Then I started getting codes for p0011 and P0014. Since then, I changed out the sensor and VVT solenoids. Then I started getting a code P0101 for MAF sensor. I replaced that however it has started to idle strange and hesitate. Now I'm getting a code for P0300 for misfire in random/multiple cylinders. I'm beat. I do not know if it's the spark plugs, coil packs, O2 sensor, fuel filter? But now after the code has cleared for MAF sensor, I'm getting the code again. But it doesn't say its current fault, it says pending fault.

Sunday, August 27th, 2023 AT 1:01 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

If the transmission was removed, it may have caused ground issues or even damaged one or two.

Since the MAF code returned, here is what I need you to do. Disconnect it and check pins B and D for ground. (See pic below)

Pin B should be a chassis ground. Pin D is a low reference. A low reference ground in a car's electrical system refers to a specific ground connection used as a reference point for sensors and components that generate or measure low-voltage signals.

Let me know what you find.

Take care,

joe

See pic below. Note: If you find voltage at pin B, let me know. There is a different setup that isn't used as often.

Image (Click to make bigger)