P0300 on GMC TERRAIN — Random/Multiple Cylinder Misfire Detected

Q: "What does P0300 mean on a GMC TERRAIN?"

"P0300 indicates: Random/Multiple Cylinder Misfire Detected. This is a ignition system code. 3 GMC TERRAIN owners have reported this to NHTSA."

Q: "What are the most common causes of P0300 on GMC TERRAIN?"

"Based on 3 NHTSA reports, the most commonly cited components are: Power Train,Engine,Back Over Prevention, Unknown Or Other,Engine,Fuel/Propulsion System, Electronic Stability Control (Esc). These percentages are based on the component field in owner complaints."

Q: "Is P0300 serious on my GMC TERRAIN?"

"Of 3 NHTSA reports for this code on GMC TERRAIN, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my GMC TERRAIN shows P0300?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0300 Means on Your GMC TERRAIN

P0300 is a diagnostic trouble code indicating: Random/Multiple Cylinder Misfire Detected. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

3 GMC TERRAIN owners have reported this issue to NHTSA across model years 2012-2019. Most reports come from the 2012, 2019 model years.

Real GMC TERRAIN Owner Reports

Source: NHTSA Complaints Database

"Code-p0014-camshaft positionb timing over-advanced or system.code-p0300 random/muitiple cylinder misfire.computerized engine analysis."

— 2012 GMC TERRAIN owner · POWER TRAIN,ENGINE,BACK OVER PREVENTION · Filed 11/15/2020

"My car oil consumption is excessive. i have repetitive codes: p0089, p0300, p0366, p228d, p0014 and the check engine light being on. car is jerking back and forth when at a stop light. tapping noise made also."

— 2012 GMC TERRAIN owner · UNKNOWN OR OTHER,ENGINE,FUEL/PROPULSION SYSTEM · Filed 04/02/2019

"On february 9th, driving home on a rough highway, my service esc, abs, traction control and check engine light (flashing) came on. i immediately pulled over, freaking out. shut my car off cause i had no clue what to do. sat for a few minutes, collecting myself and turned it back on."

— 2019 GMC TERRAIN owner · ELECTRONIC STABILITY CONTROL (ESC) · Filed 02/09/2020

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

2

'12

1

'19

Common Causes on GMC TERRAIN

Based on NHTSA complaint component analysis for this vehicle.

POWER TRAIN,ENGINE,BACK OVER PREVENTION 33.3%

UNKNOWN or OTHER,ENGINE,FUEL/PROPULSION SYSTEM 33.3%

ELECTRONIC STABILITY CONTROL (ESC) 33.3%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0300 mean on a GMC TERRAIN? ▾

P0300 indicates: Random/Multiple Cylinder Misfire Detected. This is a ignition system code. 3 GMC TERRAIN owners have reported this to NHTSA.

What are the most common causes of P0300 on GMC TERRAIN? ▾

Based on 3 NHTSA reports, the most commonly cited components are: Power Train,Engine,Back Over Prevention, Unknown Or Other,Engine,Fuel/Propulsion System, Electronic Stability Control (Esc). These percentages are based on the component field in owner complaints.

Is P0300 serious on my GMC TERRAIN? ▾

Of 3 NHTSA reports for this code on GMC TERRAIN, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my GMC TERRAIN shows P0300? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.