C1A70 on Nissan: How to Diagnose & Fix
Power Steering Control System Malfunction (EPS)
1 Nissan model · 1 documented issue · 1 critical · $250-$1,800 repair
C1A70 on Nissan by model: symptoms, diagnosis and fix
Multiple owners of the current-generation Rogue report the forward collision warning / automatic emergency braking system issuing sudden alerts, disabling itself, or in some cases braking unexpectedly with no obstacle present. Complaints commonly mention 'Front radar unavailable due to obstruction' or related warning messages in clear weather, sometimes recurring after restart. This is a safety-related issue because it can cause abrupt deceleration or loss of driver-assistance functions when expected.
Common Symptoms
- Automatic emergency braking activates with no vehicle ahead
- Forward collision warning chime or dash warning appears unexpectedly
- Front radar obstruction or unavailable message
- ProPILOT Assist disables itself
- Cruise control or driver-assist features become unavailable
How to Fix
Scan the ADAS modules for stored faults, inspect radar sensor mounting and alignment, and verify the front emblem/radar cover is clean and undamaged. Nissan service procedures typically involve radar aiming/calibration, checking harness/connectors, and replacing the radar sensor or related components if faults persist. If the vehicle has collision damage, bumper cover fitment and bracket alignment should be checked carefully because small misalignment can trigger repeated faults.
Owner tips & cautions
- TipClean the front emblem/radar area and inspect for bumper misalignment or prior minor impact before replacing parts; many owners report intermittent warnings caused by sensor aiming issues.
C1A70 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 C1A70 mean on a Nissan?
C1A70 stands for "Power Steering Control System Malfunction (EPS)." C1A70 is a manufacturer-specific chassis code (common on Toyota/Lexus) indicating a malfunction within the Power Steering Control System. It is typically stored when a controlling module receives an internal-fault signal from the Power Steering ECU, meaning the electric power steering assist is degraded or has failed. The steering wheel may feel stiff or heavy and require much more effort to turn. Because loss of power assist directly affects controllability, this should be addressed promptly. On Nissan it is documented across 1 model: Rogue.
What are the most common causes of C1A70?
The most common causes of C1A70 are: Faulty power steering (EPS) control module/ECU, Internal fault reported by the power steering motor or driver circuit, Wiring or connector damage in the EPS harness, Low system/battery voltage or charging fault, Blown EPS fuse or poor ground, Steering torque/angle sensor failure. The specific cause varies by vehicle.
How much does it cost to fix C1A70 on a Nissan?
Published repair estimates on Nissan range from $250 to $1,800 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 C1A70 on a different make?
View C1A70 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.