C1516 on Mazda: How to Diagnose & Fix
Roll Rate Sensor Signal Fault
1 Mazda model · 1 documented issue · $200-$1,200 repair
C1516 on Mazda by model: symptoms, diagnosis and fix
The NC Miata uses an electric power steering system that can fail due to a faulty steering angle sensor, EPS control module, or motor. When the system fails, the EPS warning light illuminates and power assist is lost, making the steering very heavy at low speeds. While the car remains drivable (it is manual rack-and-pinion underneath), parking and tight maneuvers become difficult.
Common Symptoms
- EPS warning light on dashboard
- Sudden loss of power steering assist
- Heavy steering at low speed
- Intermittent power steering assist
- Steering assist returns after restart
How to Fix
Diagnose with a Mazda scan tool to identify the specific failed component (sensor, module, or motor). The steering angle sensor is the most common failure and can be recalibrated or replaced relatively affordably. If the EPS motor or control module has failed, replacement costs are higher. Some owners have had success with used EPS units from junkyards ($200-$400).
Sources for this issue (1)
C1516 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 C1516 mean on a Mazda?
C1516 stands for "Roll Rate Sensor Signal Fault." C1516 is a manufacturer-specific chassis code (documented on Ford/Lincoln) indicating an invalid or out-of-range signal from the roll rate sensor. The roll rate sensor is part of the rollover/stability sensor cluster and reports the vehicle's side-to-side roll motion, which the stability and rollover mitigation systems rely on. When the module cannot validate this signal against other inputs, it disables the affected stability functions and sets the code. Meaning can vary by maker, so verify against the factory manual. On Mazda it is documented across 1 model: MX-5 Miata.
What are the most common causes of C1516?
The most common causes of C1516 are: Faulty roll rate / rollover sensor cluster, Sensor cluster mounted loose or misaligned, Damaged wiring or connector to the sensor cluster, Open or short to power/ground on signal circuits, Poor ground or low supply voltage, Restraint/stability control module fault. The specific cause varies by vehicle.
How much does it cost to fix C1516 on a Mazda?
Published repair estimates on Mazda range from $200 to $1,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for C1516 on a different make?
View C1516 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.