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P0605 on HYUNDAI SONATA

Internal Control Module Read Only Memory (ROM) Error

NHTSA Reports
4
Severity
Medium
Most Affected
2011, 2012, 2016
Crashes / Fires
0 / 0
Source: NHTSA Complaints Database · SAE J2012

What P0605 Means on Your HYUNDAI SONATA

P0605 is a diagnostic trouble code indicating: Internal Control Module Read Only Memory (ROM) Error. This code relates to the computer and output circuits system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

4 HYUNDAI SONATA owners have reported this issue to NHTSA across model years 2011-2016. Most reports come from the 2011, 2012 model years.

Real HYUNDAI SONATA Owner Reports

Source: NHTSA Complaints Database

"My husband and i are the owners of two 2011 hyundai sonatas. our complaint is based on the fact that we feel that hyundai has either purposely or in ignorance created an inherent defect in its battery system."

— 2011 HYUNDAI SONATA owner · ELECTRICAL SYSTEM · Filed 04/23/2020

"Reconnecting the battery after servicing the car the vehicle gets a check engine light p0106 code (p0106 manifold absolute pressure/barometric pressure circuit range/performance). the engine runs normal."

— 2011 HYUNDAI SONATA owner · POWER TRAIN · Filed 09/12/2018

"During cold weather, the 2.0 turbo sonata engine will cut power to the car and go into a "limp" mode if an over boost code (usually p0605 & p2110 ), is triggered. this causes an unsafe situation as there is very little power available to get out of the way or can cause a rear vehicle crash."

— 2012 HYUNDAI SONATA owner · ELECTRICAL SYSTEM,ENGINE · Filed 01/01/2015

"Purchased car with just under 97000 miles. Was working terrific. Time for the first oil change and 2 miles after the change the car froze and went limp. Traveling 45 miles per hour it recorded a trouble code on my monitoring device. P0605 - ROM error and the car was dead."

— 2016 HYUNDAI SONATA owner · ENGINE · Filed 03/20/2023

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

📊 Complaint Trend by Model Year

2
'11
1
'12
1
'16

Common Causes on HYUNDAI SONATA

Based on NHTSA complaint component analysis for this vehicle.

ELECTRICAL SYSTEM 25%
POWER TRAIN 25%
ELECTRICAL SYSTEM,ENGINE 25%
ENGINE 25%

What To Do Next

  1. 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. 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. 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 P0605 mean on a HYUNDAI SONATA? ▾
P0605 indicates: Internal Control Module Read Only Memory (ROM) Error. This is a computer and output circuits code. 4 HYUNDAI SONATA owners have reported this to NHTSA.
What are the most common causes of P0605 on HYUNDAI SONATA? ▾
Based on 4 NHTSA reports, the most commonly cited components are: Electrical System, Power Train, Electrical System,Engine. These percentages are based on the component field in owner complaints.
Is P0605 serious on my HYUNDAI SONATA? ▾
Of 4 NHTSA reports for this code on HYUNDAI SONATA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.
What should I do if my HYUNDAI SONATA shows P0605? ▾
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.

P0605 on Other Vehicles

→ All codes reported on HYUNDAI SONATA