OBD-II trouble code
U0471: Invalid Data Received From Restraints System Sensor A
The airbag (restraints) control module is still hearing from restraints system sensor A, but the data in its messages is implausible or out of range. The link is alive; the content can't be trusted. Because this feeds airbag deployment decisions, treat it as safety-critical and diagnose it promptly.
Quick facts
- System
- Network
- Category
- Network Communication
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $100 – $700
- DIY difficulty
- Shop recommended
What does U0471 mean?
Modern airbag systems rely on a network of crash and impact sensors distributed around the vehicle — in the front rails, the doors, and the pillars — that report acceleration, pressure, and impact data to the restraints (airbag) control module. The controller fuses that information to decide, in milliseconds, which airbags and seatbelt pretensioners to fire and how forcefully. 'Sensor A' is one specific sensor in that network, identified by the code. U0471 sets when a receiving module is still receiving messages from restraints system sensor A, but the data inside those messages is invalid — a value is out of range, implausible, or contradicts what other sensors and modules report.
The key distinction is that the link is alive; the content simply cannot be trusted. That is what separates U0471 from a lost-communication code such as U0170, where sensor A has gone completely silent. With invalid data, messages are still arriving — they just carry numbers the controller rejects. Because this is a passive-safety circuit, the restraints module responds conservatively: it typically stores the fault, illuminates the airbag/SRS warning light, and may set the restraints system into a fault state, meaning an airbag or pretensioner might not deploy as designed in a crash.
Common causes cluster around whatever corrupts the sensor's signal or its network link: low system voltage or a poor ground; corroded, loose, or damaged connectors — restraints sensors mount in crash zones where moisture and road exposure are real; chafed or damaged wiring; the sensor itself drifting out of range; or a software/configuration problem, especially after a sensor or module was replaced with a unit that wasn't programmed to the vehicle. Collision repair near a sensor is a frequent trigger. The vehicle usually starts and drives normally, which is the trap — it feels fine while part of its crash protection may be offline. U0471 should be diagnosed by a technician equipped to work safely on airbag circuits, since careless handling of restraint wiring can cause an accidental deployment.
Common causes
- Corroded, loose, or damaged connector at restraints sensor A
- Water or moisture intrusion at the sensor or its connector in a crash-zone location
- Low system voltage, a weak battery, or a poor ground
- Chafed or damaged wiring corrupting the sensor's messages in transit
- Sensor A drifting out of range or internally failing
- Sensor or restraints module replaced without correct programming/configuration
- Connector disturbed or not reseated after collision repair or other service
- Outdated, corrupted, or mismatched module software
Symptoms
- Airbag/SRS warning light on, often with an 'airbag service required' message
- Restraints system set to a fault state, with deployment behavior potentially affected
- Companion restraints or network codes stored alongside U0471
- Intermittent setting after driving over rough roads (connector/wiring related)
- Vehicle otherwise starts and drives normally, masking the loss of protection
Diagnostic steps
- 1.Scan the restraints/SRS module and all modules with a tool that can access the airbag system; record every stored code. Follow safe SRS procedure — disconnect the battery and wait the specified time before handling airbag circuits.
- 2.Identify the exact location of restraints sensor A for the specific vehicle using factory service information.
- 3.Confirm whether the sensor or restraints module was recently replaced — an unprogrammed unit is a leading cause of invalid data.
- 4.Load-test the battery and verify charging voltage and the module's grounds.
- 5.Inspect the sensor's connector and harness for corrosion, moisture, backed-out terminals, and chafing, especially after collision repair.
- 6.Verify the module and sensor carry the correct calibration/configuration for the vehicle.
- 7.If wiring, connectors, and power are good but the data stays invalid, the sensor itself is the likely fault — replace it with the correct part and clear codes per factory procedure.
Repair cost
$100 – $700
Cost depends on the cause. Diagnosis usually runs $100-$200. Correcting low voltage, a bad ground, or a connector is often $150-$400. Reprogramming or configuring the sensor/module is typically $100-$350 when that is all that's needed. Replacing restraints system sensor A with any required programming typically runs $200-$600+ depending on the sensor and its location. Because this is a safety system, prioritize a correct diagnosis over the cheapest fix.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with airbag / srs crash sensor replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
Leave this one to a qualified shop. It typically involves emissions-critical components, refrigerant handling, or other work that requires manufacturer-grade tooling, training, or certification. DIY attempts often produce a more expensive problem than the original code.