U0121 on DODGE CHARGER — Lost Communication With Anti-Lock Brake System (ABS) Control Module A

Q: "What does U0121 mean on a DODGE CHARGER?"

"U0121 indicates: Lost Communication With Anti-Lock Brake System (ABS) Control Module A. This is a network communication code. 2 DODGE CHARGER owners have reported this to NHTSA."

Q: "What are the most common causes of U0121 on DODGE CHARGER?"

"Based on 2 NHTSA reports, the most commonly cited components are: Vehicle Speed Control,Service Brakes,Engine, Power Train,Electrical System,Unknown Or Other. These percentages are based on the component field in owner complaints."

Q: "Is U0121 serious on my DODGE CHARGER?"

"Of 2 NHTSA reports for this code on DODGE CHARGER, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my DODGE CHARGER shows U0121?"

"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 U0121 Means on Your DODGE CHARGER

U0121 is a diagnostic trouble code indicating: Lost Communication With Anti-Lock Brake System (ABS) Control Module A. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

2 DODGE CHARGER owners have reported this issue to NHTSA across model years 2006-2014. Most reports come from the 2006, 2014 model years. The most commonly reported component is Vehicle Speed Control,Service Brakes,Engine (50.0% of reports).

Real DODGE CHARGER Owner Reports

Source: NHTSA Complaints Database

"Speedometer quit working, car jumps hard into reverse and drive, will not shift out of first gear, code u0100, u1120, u0121, u0103, replaced computer and had no change of condition, no transmission dipstick to check fluid, a must take to dealer item that is not sensible."

— 2006 DODGE CHARGER owner · VEHICLE SPEED CONTROL,SERVICE BRAKES,ENGINE · Filed 05/18/2017

"While driving i-405n at approx 63mph, my cel & tc lamp illuminated and car stalled out leaving me with no steering functions, then suddenly it turned back on and red-lined for almost 20secs straight leaving me at wot speeding straight towards the vehicle in front of me."

— 2014 DODGE CHARGER owner · POWER TRAIN,ELECTRICAL SYSTEM,UNKNOWN OR OTHER · Filed 11/23/2015

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

📊 Complaint Trend by Model Year

1

'06

1

'14

Common Causes on DODGE CHARGER

Based on NHTSA complaint component analysis for this vehicle.

VEHICLE SPEED CONTROL,SERVICE BRAKES,ENGINE 50%

POWER TRAIN,ELECTRICAL SYSTEM,UNKNOWN or OTHER 50%

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 U0121 mean on a DODGE CHARGER? ▾

U0121 indicates: Lost Communication With Anti-Lock Brake System (ABS) Control Module A. This is a network communication code. 2 DODGE CHARGER owners have reported this to NHTSA.

What are the most common causes of U0121 on DODGE CHARGER? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Vehicle Speed Control,Service Brakes,Engine, Power Train,Electrical System,Unknown Or Other. These percentages are based on the component field in owner complaints.

Is U0121 serious on my DODGE CHARGER? ▾

Of 2 NHTSA reports for this code on DODGE CHARGER, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my DODGE CHARGER shows U0121? ▾

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.

U0121 on Other Vehicles

→ All codes reported on DODGE CHARGER