Top 11 Mistakes People Make on the G2 Test in Ontario (2026)
Every year, thousands of Ontario drivers fail their G2 road test — often for the same avoidable reasons. Knowing what these mistakes are before your test gives you a real advantage. We've added a critical #11 that trips up many drivers at 4-way stops.
Last updated: August 2026 — reflects current Ontario DriveTest standards.
Important: Some of these mistakes are automatic fails (critical errors). Others accumulate as minor faults. Either way, knowing them in advance is the best way to avoid them on test day.
Critical Errors vs Minor Faults — What's the Difference?
The G2 examiner uses a standardized MTO score sheet with two categories of errors. Understanding the difference helps you prioritize what to focus on during practice.
Critical Errors — Immediate Fail
One critical error ends your test immediately, regardless of how well you drove otherwise.
- Rolling stop at a stop sign
- Running a red light or stop sign
- Dangerous lane change
- Failing to yield to a pedestrian
- Hitting a curb or object
Minor Faults — Accumulate
Minor faults don't fail you individually, but too many of them will. The examiner cannot tell you how many you've accumulated during the test.
- Infrequent mirror checks
- Driving slightly below speed limit
- Slow signal cancellation
- Minor hesitation at intersections
- Imperfect parallel park (but within 30 cm)
For a complete breakdown, see our G2 Common Test Errors guide.
The 11 Most Common G2 Test Failures
Rolling stops at stop signs
The #1 reason people fail. You must come to a complete, full stop — wheels not moving — before the stop line. Even slowing to 1 km/h is a fail. The examiner watches your wheels, not just your speed.
Fix: Practice stopping completely at every stop sign, every time — even when no one is watching. After stopping, silently count "one-one-thousand" before proceeding. This builds the habit of a genuine full stop.
Not shoulder checking before lane changes
Mirrors don't show your blind spots. Failing to turn your head and look is a fault every single time.
Fix: Make shoulder checks a habit. Before every lane change: mirror → signal → mirror → shoulder check → move.
Forgetting to signal
You must signal every turn and lane change, even when no other cars are around. Examiners mark this every time. Signal at least 30 metres before turning in the city, and 150 metres on a highway. Critically: signal before braking, not after — signalling after you've already slowed down defeats the purpose of warning other drivers.
Fix: Make signalling automatic. Every turn, every lane change, every time — signal first, then brake, then turn.
Driving too slowly
Going 20 km/h under the speed limit shows lack of confidence and is marked as a fault. The examiner wants to see you drive at a normal, safe pace.
Fix: Drive at or near the posted speed limit. In a 50 km/h zone, aim for 45–50 km/h.
Parking too far from the curb
During parallel parking, you must park within 30 cm of the curb. More than that is a fault.
Fix: Practice parallel parking until you can consistently park within 30 cm. Measure it during practice.
Improper lane positioning during turns
When turning left, you must turn into the left lane. When turning right, turn into the right lane. Crossing lanes during a turn is a fault.
Fix: Stay in your lane throughout the turn. Don't cut corners or swing wide.
Not checking mirrors frequently enough
Examiners watch your eyes. You should check your mirrors every 5–8 seconds while driving.
Fix: Make mirror checks a rhythm. Every few seconds: rear-view, side mirrors, back to the road.
Hesitating at intersections
Excessive hesitation when it's your turn to go is marked as a fault. It disrupts traffic flow and shows uncertainty.
Fix: When it's your turn, go. Check, confirm it's clear, and proceed with confidence.
Improper following distance
Tailgating — following too closely — is a fault. You need at least 2–3 seconds of space in normal conditions.
Fix: Use the 2-second rule: pick a landmark, count 2 seconds after the car ahead passes it.
Not cancelling your signal
After completing a turn or lane change, your signal must be off. Leaving it on confuses other drivers and is a fault.
Fix: After every turn or lane change, check that your signal is off. Make it part of your post-manoeuvre routine.
Improper 4-way stop procedure
Many drivers don't know the exact right-of-way rules at 4-way stops, and examiners test this directly.
Fix: Remember: first to arrive goes first. If two cars arrive simultaneously, yield to the vehicle on your right. If you're turning left, always yield to straight-through traffic — even if you arrived first.
Avoid These Mistakes and You're Halfway There
The G2 test isn't about being a perfect driver — it's about being a safe and predictable one. The 11 mistakes on this list account for the vast majority of G2 failures in Ontario. Eliminate them from your driving and you dramatically increase your chances of passing on the first try.
Focus especially on the top three: complete stops, shoulder checks, and consistent signalling. These are the habits examiners watch most closely, and they're all things you can practice every single time you drive.
Ready to put it all together? Read our complete guide to passing the G2 test on your first try, or explore the Full G2 Guide for everything you need to know about Ontario's graduated licensing system.
Frequently Asked Questions
How many faults am I allowed before failing the G2 test?
There's no fixed number. Minor faults accumulate — too many will fail you even without a critical error. Critical errors (like rolling stops or dangerous actions) fail you immediately, regardless of how well you performed otherwise.
Can I fail the G2 test for driving too slowly?
Yes. Driving significantly below the speed limit shows lack of confidence and is marked as a fault. Aim to drive at or near the posted speed limit.
Is forgetting to signal an automatic fail?
Not always, but it's a fault that accumulates. Multiple missed signals will fail you. Signal every turn and lane change, every time.
What's the most common reason people fail the G2 test?
Rolling stops at stop signs. It's the single most common failure point on the G2 test in Ontario.
What is the difference between a critical error and a minor fault?
A critical error causes an immediate test failure — examples include rolling stops, running red lights, or dangerous actions. Minor faults are smaller errors that accumulate; too many of them will also fail you, even without a single critical error.