2021 Mazda CX-5 electrical problems

Filed Nov 4, 2026 · Electrical, Engine · PA

[FIELD: DESCRIBE WHAT HAPPENED] Severe ongoing safety defects uncorrected after 2 dealer repair attempts ([XXX] & [XXX]). LIGHTS: High beams failed [XXX], requiring continuous manual hold to function. ADAS/HUD: HUD failed to project Nov 3. Cameras cut out with false "sensor blocked" error (Oct [XXX] & [XXX]. Infotainment screen turns off while driving (multiple dates). ENGINE: Stalls in traffic/drive-thrus and fails to restart. MIRROR: Power side mirror glass/folding intermittently does not fold out and glass does not move/adjust. Dealership reportedly ordered part during Sept [XXX] repair window, has not been repaired yet with no update from dealership. [FIELD: HOW WAS SAFETY AFFECTED?] High-beam failure forces single-handed steering at night. Sudden ADAS/screen shutdowns cause driver distraction and lose safety monitoring. Engine stalling creates severe collision risks at intersections and on active roads.Mirror issue prevents ability to safely monitor changing road conditions/other drivers. [FIELD: WARNING LIGHTS AND MESSAGES] Cluster displayed "System Disabled: Poor Outward Camera Visibility" in clear weather with clean windshield (Oct [XXX] & [XXX]). No warnings for engine stalling, HUD loss, or headlight failure. [FIELD: REPRODUCTION & INSPECTIONS] Dealer failed to reproduce due to brief test drives. Inspected only by Jim Shorkey Kia and 1 independent mechanic (who diagnosed earlier resolved oil leak/solenoid timing belt issue). INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 31, 2026 · Brakes, Driver assistance · NC

During hard or emergency braking at higher speeds, the Anti-Lock Braking System (ABS) activates and pulsates normally for approximately 1 to 2 seconds, then abruptly fails and stops pumping. Immediately after the ABS cuts out, the wheels lock up completely, causing the vehicle to skid with loss of traction/stability control, reduced steering control, and extended stopping distances. At the exact moment the ABS stops pumping and the wheels lock, the dashboard displays a "Smart Brake System Malfunction" warning message and illuminates both the ABS warning light and the TCS/DSC (Traction Control / Dynamic Stability Control) indicator light. However, as soon as the braking event ends, all warning lights and the error message turn off automatically on their own without needing to restart the vehicle. Because the fault clears itself immediately during the drive, there is no active warning on the dashboard showing that the ABS, TCS/DSC, and Smart Brake systems are compromised until the next high-speed emergency braking situation occurs. Vehicle diagnostic scans recorded error codes U3003-16-68 (Circuit voltage below threshold), U0316-09-08 (Error signal received from DSC/ABS module), and B13D3-16-8A. The vehicle has been inspected and serviced twice by an authorized Mazda dealership for this exact safety defect: on 8-Sep-2026, the dealership replaced the 12V vehicle battery, and on Oct-5-2026, the dealership replaced the ABS module. Neither repair resolved the issue, and on both occasions the dealership returned the vehicle claiming it was fixed. Testing the brakes confirmed the defect persists: under hard braking, the ABS still cuts out after 1 to 2 seconds, locks the wheels, and momentarily triggers the ABS light, TCS/DSC light, and "Smart Brake System Malfunction" warning before clearing itself again.

Filed Jul 16, 2026 · Driver assistance, Electrical · LA

The vehicle's Connectivity Master Unit (CMU) suffers from a severe, persistent electronic hardware malfunction that causes the central information display and dashboard telemetry to blink, cycle, and drop signals erratically. This specific hardware architecture failure threatens to corrupt data transmission lines directly connected to the Advanced Driver Assistance System (ADAS), creating an imminent safety risk of unintended automatic emergency braking or false sensor deployment during highway transit. The vehicle utilizes the exact same defective CMU hardware component that the manufacturer has acknowledged and recalled on other model cohorts; however, the manufacturer has explicitly excluded this specific VIN from safety recall eligibility. Diagnostic attempts by the authorized dealer network relied solely on forcing digital software updates that completely failed to correct the core hardware signaling instability, leaving the vehicle un-repaired and presenting an active, unmitigated electrical and safety hazard on public roads.

Filed Nov 16, 2025 · Electrical · CT

Radio audio randomly stopped working and you have to disconnect the negative or you have to leave the car off essentially all night. It’s definitely unknown issue there’s videos all over YouTube about it and there’s forms on read about it.

Filed Jul 28, 2025 · Body, Electrical · PA · crash · 1 injury

..... On at least 5 seperate occasions our 2021 mazda cx5 SUV accelerated to a high rate of speed (on it's own). It has done it to my wife and I both. I contacted two different mazda service centers and was advised they have no knowledge of this and that there are no open recalls or tsb's and as intermittent as it is it would be almost impossible to duplicate. On july 18th the car accelerated (on its own) again but this time it drove my wife into a tree at aprox. 35/40 MPH breaking her ribs. The body shop informed me this morning that the car is a total loss. Mazda needs to get to the bottom of this and resolve this issue asap. This time it was a tree, the next time it may be at a crosswalk or at an intersection. It's just a mater of time until someone is killed or at the very least badly hurt. I don't know how mazda can be unaware of this problem, it's all over the internet. Our body shop pulled it up on line and was shocked at the amount of complaints/ concerns that existed related to this problem. Please investigate this because the next person may not be as fortunate. Thank you in advance.

Filed Jun 22, 2025 · Electrical · WA

Infotainment system went dark and I cannot get it to come back on. I’ve read that this has been an ongoing issue and is covered in Mazda cx5 models up to 2020 thru a class action lawsuit, but my one is a 2021 (manufactured we’ll before 2021 though) with a virtually identical system.

Filed Oct 9, 2024 · Electrical · NC

Just got a oil change. Told my battery is almost dead. Upon looking up information I found a letter for recall for 2021 Mazda Cx5 for Dealer Rework 41 telematics communication unit concern. I called the Dealership and they are refusing to fix the problem. Looks like its just a software update is needed. My car only has 24,666 miles and according to the letter should be fixed. [XXX] I bought the car used in April and did a search for recalls prior to buying the car. There is non on Mazda website or vin search. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Dec 6, 2023 · Electrical · NJ

Screen blank when I am drving a while without any problem. I saw online and many owner have same problem. I followed company and online instruction. the problem could not be solved.

Filed Jun 26, 2023 · Electrical · IL

Our 2021 Mazda CX-5 infotainment/backup screen went black/blank. I could still hear radio, but when vehicle put in reverse, backup camera not working. Tried a recommended “fix” which was putting vehicle in reverse and pushing down volume knob for 3 seconds which did not work. Turned vehicle off, waited a minute and then restarted but screen still black and backup camera not working. After vehicle sat for approximately 15 minutes, restarted vehicle and system back to normal. Contacted decker and they had no fix. This is the third time this type of incident has occurred since purchasing vehicle in March 2021.

Filed Aug 27, 2022 · Acceleration, Driver assistance · IA · crash

I bought a 2021 Mazda CX-5 from Ramsey Mazda of Des Moines, IA. It offered comparable comfort & features. A selling point was the safety features touted by the salesman. Odd things occurred during the first few months but I attributed it to a learning curve. I saw some odd messages but I really did not think it was relevant until June 28, 2022. I was backing out from a parking space. The Blind Spot Monitoring failed to indicate a car approaching from the right that then stopped in my blind spot. I hit the car behind me. Despite the fact, I understand personal responsibility, I never would have had the BSM worked correctly. I dropped the car off on July 15, 2022 to the Ramsey Mazda Service Center after the BSM failure and a Check Engine Light appeared. I already had the Ramsey Mazda Collision Center look at the car and told them of the of the BSM failure. That man doing the estimate said he had heard of those failures before. On July 15, I dropped the car off at the Ramsey Mazda Service Center to look at the BSM, a Check Engine light, the door locks and the hatch opening on its own. I tried to tell the Service Center that there was something severely wrong with the electrical system in this vehicle. I have a witness to its erratic behavior, but I was continually dismissed. There is more wrong now with my car than when I left it with the dealership. They kept my car for 19 days. During the 19 days, I continually had to call and check on the status of my vehicle. Ramsey Mazda was not and is still not initiating conversation with me or responding to voicemails. The manager of the Ramsey Mazda Dealership on Hickman in Des Moines, IA (JD) is supposed to be handling this issue personally with Mazda Corporate because it now “appears” to be affecting multiple systems in his words. Multiple issues include but are not limited to the BSM, Seat Belt notifications, power driver’s seat, camera system, cruise control system, entertainment system, & hands free communications.