P3400 on HONDA ACCORD — P34C8

Q: "What does P3400 mean on a HONDA ACCORD?"

"P3400 indicates: P34C8. This is a powertrain code. 4 HONDA ACCORD owners have reported this to NHTSA."

Q: "What are the most common causes of P3400 on HONDA ACCORD?"

"Based on 4 NHTSA reports, the most commonly cited components are: Engine, Power Train. These percentages are based on the component field in owner complaints."

Q: "Is P3400 serious on my HONDA ACCORD?"

"Of 4 NHTSA reports for this code on HONDA ACCORD, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my HONDA ACCORD shows P3400?"

"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 P3400 Means on Your HONDA ACCORD

P3400 is a diagnostic trouble code indicating: P34C8. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

4 HONDA ACCORD owners have reported this issue to NHTSA across model years 2008-2012. Most reports come from the 2008, 2010 model years. The most commonly reported component is Engine (75.0% of reports).

Real HONDA ACCORD Owner Reports

Source: NHTSA Complaints Database

"The check engine light kept coming up with the maintenance light and the oil level kept dropping.i took it to autozone and i got these coded p3497 and p3400. i did a research myself and found out that there was a recall on this issue as stated in honda's bulletin 11-033."

— 2008 HONDA ACCORD owner · ENGINE · Filed 09/09/2018

"Accord v6 with variable cylinder management (vcm). at exactly 65,000 miles, in expressway rush hour traffic, immediate catastrophic power loss and check engine light comes on. tow to honda dealer. dealer receipt shows code p3400 found and dealer replaced rear oil pressure sensor."

— 2010 HONDA ACCORD owner · ENGINE · Filed 04/05/2017

"While driving at highway speed (55 mph) and then slowing down for traffic, the variable timing control actuator apparently stuck. the engine warning light came on followed by white smoke from the tailpipes. there was an immediate lack of power trying to accelerate again."

— 2011 HONDA ACCORD owner · ENGINE · Filed 02/20/2019

"Check engine light is on, car was shaking when driving. took it to the dealership and was told oil level pressure switch is bad and need to be replaced( mtc p3400),it is not covered under 5yr 60k miles powertrain warranty. it was quoted >$300 to fix the car. the car has 59k miles on."

— 2012 HONDA ACCORD owner · POWER TRAIN · Filed 06/22/2016

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

📊 Complaint Trend by Model Year

1

'08

1

'10

1

'11

1

'12

Common Causes on HONDA ACCORD

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 75%

POWER TRAIN 25%

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 P3400 mean on a HONDA ACCORD? ▾

P3400 indicates: P34C8. This is a powertrain code. 4 HONDA ACCORD owners have reported this to NHTSA.

What are the most common causes of P3400 on HONDA ACCORD? ▾

Based on 4 NHTSA reports, the most commonly cited components are: Engine, Power Train. These percentages are based on the component field in owner complaints.

Is P3400 serious on my HONDA ACCORD? ▾

Of 4 NHTSA reports for this code on HONDA ACCORD, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my HONDA ACCORD shows P3400? ▾

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.

P3400 on Other Vehicles

→ All codes reported on HONDA ACCORD