🚨 Diagnostic Profile
Vehicle Make: ACURA
Technical Description: BARO Circuit Range Performance Malfunction
This code indicates that the Barometric Pressure (BARO) sensor circuit is sending a signal to the Engine Control Module (ECM) that falls outside of the expected operational range for current environmental and engine conditions. The BARO sensor helps the ECM adjust fuel trim and ignition timing based on altitude and atmospheric pressure. A performance malfunction typically points to a degraded sensor signal, wiring issue, or a problem with the manifold absolute pressure/barometric pressure sensor assembly rather than a complete circuit failure.
🚨 Repair Difficulty Tier
Difficulty Rating: [Intermediate]
This repair requires the use of a professional-grade OBD-II scan tool capable of reading live sensor data (Mode 6/Freeze Frame data) and a digital multimeter to test circuit continuity and voltage reference signals. While no specialized module programming is typically required for this specific code, proper diagnosis demands an understanding of sensor circuits, reference voltages, and signal wiring, making this unsuitable for a true beginner but manageable for an intermediate DIY mechanic with the right tools.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
Begin by visually inspecting the wiring harness and electrical connector leading to the MAP/BARO sensor, usually located on or near the intake manifold. Look for corrosion, chafed wires, or loose connector pins. Check for any vacuum leaks near the intake manifold gasket, as a leak can cause pressure readings to fall outside the expected range. Inspect the sensor itself for physical damage or contamination from oil or debris.
Step 2: Diagnostic Verification
Connect an OBD-II scan tool and access live data streams for BARO and MAP sensor PIDs. Compare the BARO reading to the actual known atmospheric pressure for your current altitude and location — a significant deviation confirms sensor malfunction. Using a digital multimeter, backprobe the sensor connector to verify the 5-volt reference signal from the ECM, ground continuity, and the signal return voltage. A signal voltage that does not fluctuate appropriately with throttle changes or altitude confirms a faulty sensor or wiring fault.
Step 3: Resolution & Reset Process
If wiring and connectors test correctly but the sensor signal remains erratic or out of range, replace the BARO/MAP sensor with an OEM or OEM-equivalent part. After installation, clear the diagnostic trouble codes (DTCs) using the scan tool and perform a test drive to allow the ECM to complete its readiness monitors. Recheck live data to confirm the BARO reading now aligns with expected atmospheric values and that no codes return.
📦 Parts, Labor, and Budget Estimates
Required Components/Software: Replacement BARO/MAP sensor, OBD-II diagnostic scan tool, digital multimeter, dielectric grease for connector protection.
Average Component Price: $45 – $120 for the sensor, depending on OEM vs. aftermarket sourcing.
Estimated Labor Hours: 0.5 – 1.0 hour for diagnosis and sensor replacement, assuming no additional wiring repair is needed. Add 0.5 hours if harness repair is required.