C1A04 on 2020-2022 Nissan Sentra — Front Right Height Sensor Fault
1 vehicles · 1 makes · $250-$1,800 repair
How to diagnose and fix C1A04: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Nissan Sentra · 2020–2022
Multiple owners of the current B18-generation Sentra report the Forward Collision Warning and Automatic Emergency Braking systems triggering warnings or braking unexpectedly, sometimes with no vehicle or obstacle present. This is a safety-critical issue because false braking or loss of collision mitigation can increase crash risk in traffic.
Common Symptoms
- Automatic emergency braking activates unexpectedly
- Warning chime with no obstacle ahead
How to Fix
Scan the ADAS system for stored faults, inspect the front radar sensor mounting and alignment, and check for contamination, impact damage, or harness issues. Owners should also verify that any applicable software updates or service campaigns have been completed.
Owner tips & cautions
- TipKeep the front radar area clean and inspect for minor bumper damage or misalignment after even light impacts; many owners report intermittent faults after parking-lot contact.
Sources for this issue (3)
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C1A04 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 C1A04 mean?
C1A04 stands for "Front Right Height Sensor Fault." C1A04 is a manufacturer-specific chassis code (documented on Nissan/Infiniti applications) indicating a fault with the front-right height sensor. This sensor measures ride height at the front-right corner and feeds systems such as auto-leveling suspension or automatic headlight aiming. When the module sees an invalid or out-of-range signal, the dependent feature is disabled and a warning may appear. Because it is a manufacturer code, confirm the exact application against the factory service manual.
What are the most common causes of C1A04?
The most common causes of C1A04 are: Faulty front-right height sensor, Damaged sensor link/arm or mounting, Damaged or corroded wiring/connector, Water intrusion at the connector, Poor ground or low supply voltage, Suspension/leveling control module fault. The specific cause varies by vehicle.
How much does it cost to fix C1A04?
Repair costs for C1A04 range from $250 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by C1A04?
Au7o has documented C1A04 across 1 vehicle models from 1 manufacturers: Nissan.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.