C1A00 on Mitsubishi: How to Diagnose & Fix
Stability Control System Fault
1 Mitsubishi model · 1 documented issue · 1 critical
C1A00 on Mitsubishi by model: symptoms, diagnosis and fix
Early Eclipse Cross models with Forward Collision Mitigation brake hard for objects that are not there. This is not just owner perception — NHTSA recall 18V620000 covers 2018-2019 Mitsubishi vehicles whose FCM-ECU software applies braking for longer than needed even after a pedestrian is no longer detected, with the stated consequence that drivers brake harder in response and increase rear-end collision risk. Companion recall 18V621000 covers a hydraulic unit ECU software defect that may prevent automatic emergency braking, ABS, electronic stability control and Brake Auto Hold from working properly. Owner complaints go beyond the recall scope: filings describe adaptive cruise control triggering FCM braking when cresting hills with nothing ahead, and repeated multi-warning-light events with hard braking recurring several times a year despite dealer repairs. The camera-and-radar fusion is sensitive to road crown, overhead signs and reflective surfaces, and the system's brake authority is high enough that a false trigger at highway speed is genuinely hazardous.
Common Symptoms
- Vehicle brakes hard with no object ahead
- False forward collision warning alarms at any speed
- Braking triggered when cresting a hill on adaptive cruise
- Multiple dashboard warning lights flash simultaneously
- FCM, ASC and ABS warning lights on together
- Automatic emergency braking or Brake Auto Hold inoperative
How to Fix
First, run the VIN against NHTSA recalls and have both 18V620000 (FCM-ECU reprogram, Mitsubishi reference SR-18-007) and 18V621000 (hydraulic unit ECU reprogram, reference SR-18-008) performed free of charge if not already applied. If phantom braking persists after the reflashes, the next step is a windshield-camera aim and calibration — a replaced or improperly calibrated windshield is a very common cause of false triggers, and the camera requires a targeted static or dynamic aiming procedure, not just a mount swap. Check the front radar sensor behind the lower grille for physical misalignment, ice packing or a bent bracket from minor parking contact. As a temporary measure the FCM system can be switched off from the vehicle settings menu before each drive, though it re-arms at every ignition cycle.
Sources for this issue (2)
C1A00 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C1A00 mean on a Mitsubishi?
C1A00 stands for "Stability Control System Fault." This is a chassis/stability-control code that signals a general fault within the electronic stability control system — the network of sensors and the controller that keep the vehicle from skidding or losing traction during hard cornering or slippery conditions. C1A00 typically means the stability control module detected an internal fault or a problem somewhere in the system it can't fully resolve, so it may disable stability and traction control and turn on the related warning lights. Importantly, C1A00 is a manufacturer-specific code and its precise meaning varies by brand, and the full code often includes additional sub-numbers needed to pinpoint the exact fault. Because it's broad, an accurate diagnosis usually requires a capable scan tool to read the extended code and any companion codes. On Mitsubishi it is documented across 1 model: Eclipse Cross.
What are the most common causes of C1A00?
The most common causes of C1A00 are: Internal stability control module fault, Companion sensor faults (wheel speed, steering angle, yaw/lateral) triggering the system, Wiring, connector or ground problems in the stability control circuit, Low system or battery voltage / charging issue, Module software, calibration or configuration fault, Damaged or unplugged sensor harness after service, Faulty ABS/stability hydraulic control unit (less common). The specific cause varies by vehicle.
How much does it cost to fix C1A00 on a Mitsubishi?
Repair costs vary widely with the root cause and Mitsubishi model; each issue on this page carries its own estimate where one is published.
Looking for C1A00 on a different make?
View C1A00 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.