P2473 – DPF Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 4)

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: Range/Performance | Location: Bank 2, Sensor 4

Definition source: SAE J2012/J2012DA (industry standard)

P2473 indicates the powertrain control module detected a range/performance problem in the DPF temperature sensor circuit identified as Bank 2 Sensor 4. “Range/performance” means the signal is not behaving as expected for the operating conditions, such as responding too slowly, being biased high/low without reaching an outright “high/low” electrical fault, or not correlating with related temperature or exhaust inputs. The exact sensor location, wiring layout, and monitor criteria vary by vehicle, so confirm connector views, pinouts, and test specifications using the appropriate service information before diagnosing.

What Does P2473 Mean?

P2473 – DPF Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 4) means the control module has determined that the DPF temperature sensor circuit signal for Bank 2 Sensor 4 is outside expected behavior (plausibility) rather than being simply open, shorted high, or shorted low. Under SAE J2012 DTC conventions, this “range/performance” classification points to a signal that does not track expected exhaust temperature changes, does not correlate with other relevant sensors, or shows a biased or sluggish response, and it requires circuit and sensor validation with scan data and electrical tests.

Quick Reference

• System: Powertrain
• Official meaning: DPF Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 4)
• Standard: ISO/SAE controlled
• Fault type: Range/Performance
• Severity: The MIL may illuminate and the vehicle may limit certain functions (such as regeneration strategy), potentially affecting drivability depending on operating conditions.

Symptoms

• MIL: Check engine light illuminated, possibly after a drive cycle that runs exhaust temperature monitoring.
• Regeneration behavior: Regeneration may be delayed, inhibited, or commanded more often than expected (varies by vehicle strategy).
• Reduced power: Limited torque/derate may occur if the system cannot reliably monitor DPF temperature.
• Fuel economy: Noticeable change in fuel consumption due to altered aftertreatment management.
• Idle quality: Idle speed or stability may change during attempted aftertreatment events (varies by vehicle).
• Exhaust odor/heat: Unusual exhaust odor or higher perceived exhaust heat during operating conditions that normally trigger monitoring.
• Scan data anomaly: Bank 2 Sensor 4 temperature reading appears implausible, slow to respond, or inconsistent with related exhaust temperature inputs.

Common Causes

• Connector issues: Loose fit, corrosion, moisture intrusion, damaged seals, or terminal fretting at the DPF temperature sensor (Bank 2 Sensor 4) connector.
• Harness damage: Chafed, pinched, melted, or heat-soaked wiring near the exhaust/aftertreatment routing causing skewed or slow sensor signal response.
• High resistance in circuit: Partial opens, poor splices, or damaged conductors creating excessive resistance that distorts the signal without a complete open.
• Reference/return integrity problems: Unstable sensor feed or sensor return paths (as applicable by vehicle design) causing the sensor signal to fall outside expected plausibility behavior.
• Intermittent connection: Vibration-related intermittents at connectors, intermediate junctions, or near engine/exhaust movement points leading to range/performance detection during certain conditions.
• Sensor drift or response fault: DPF temperature sensor element aging, contamination, or internal failure causing a biased reading or slow response compared with expected temperature changes.
• Aftertreatment thermal behavior mismatch: Exhaust/DPF temperature dynamics not matching what the control module expects (varies by vehicle), triggering a plausibility/range/performance fault rather than a hard circuit fault.
• Control module interpretation issue: Software/calibration or internal processing concerns (less common) that misclassify valid signals as out of range/performance; verify only after circuit and sensor checks.

Diagnosis Steps

Tools you’ll typically need include a scan tool that can read freeze-frame data and live data, a digital multimeter, and access to the vehicle’s wiring diagrams and connector pinouts. A backprobe kit, test leads, and basic hand tools help with circuit checks. If available, live-data logging during a road test can capture the conditions that trigger the range/performance fault.

1. Confirm the code and capture data: Verify P2473 is active or stored, record freeze-frame data, and note any companion DPF/aftertreatment temperature or plausibility-related codes that may influence diagnosis.
2. Check scan tool data plausibility: View the DPF temperature sensor (Bank 2 Sensor 4) PID and compare its behavior to related temperature signals (other exhaust/DPF temperature sensors, if equipped). Look for biased readings, slow response, or a signal that doesn’t track expected changes.
3. Perform a thorough visual inspection: Inspect the sensor body and harness routing near hot exhaust components. Look for melted insulation, abrasion, pinch points, poor routing, and evidence of contact with the exhaust/heat shields.
4. Inspect connectors and terminals: Disconnect the sensor connector and inspect for corrosion, bent pins, spread terminals, water intrusion, damaged seals, and poor terminal tension. Repair pin fit issues and ensure the connector locks fully.
5. Wiggle test for intermittents: With live data displayed (or logged), gently wiggle the harness and connectors from the sensor back toward the main harness. Any sudden jumps, dropouts, or abnormal lag in the temperature signal indicates an intermittent connection or conductor issue.
6. Verify circuit integrity against service information: Using the wiring diagram, identify the sensor signal, sensor feed/reference (if used), and sensor return/ground circuits. Check for opens and excessive resistance end-to-end where accessible; do not assume color codes or pin locations without the correct diagram.
7. Voltage-drop testing under load: When the circuit design allows, perform voltage-drop tests on the sensor feed and return paths while the system is operating to find high resistance at terminals, splices, or grounds. Compare results to service information expectations rather than using generic thresholds.
8. Check for shorts to power/ground without misclassifying the fault: Even though this is a range/performance DTC, a partial short can skew readings without setting a dedicated high/low code. With the connector unplugged and key state per service information, check for unwanted continuity between signal and power/ground circuits.
9. Evaluate sensor response: If service information provides a functional test, perform it to verify the sensor responds appropriately and smoothly to changing exhaust temperature. Focus on response time and stability rather than a single fixed value.
10. Cross-check with operating conditions: If safe and permitted, perform a controlled road test while logging relevant PIDs (DPF temperature sensors, calculated temperatures, regeneration-related statuses if available). Try to recreate freeze-frame conditions to see whether the sensor signal becomes biased, slow, or inconsistent.
11. Rule out module-side issues last: Only after wiring, connectors, power/return integrity, and sensor function test good, consider control module inputs/outputs (pin fit at the module connector, water intrusion, or internal issues). Follow service information before condemning a module.

Professional tip: For range/performance faults, avoid relying on a single snapshot reading. Use live-data logging to evaluate how the DPF temperature sensor (Bank 2 Sensor 4) behaves during transitions (warm-up, load changes, decel, and any aftertreatment events). Many issues show up as delayed response, intermittent spikes, or a persistent offset relative to related temperature sensors rather than a complete signal loss.

Possible Fixes & Repair Costs

Repair costs for P2473 vary widely by vehicle because the correct fix depends on confirming whether the fault is in the sensor, wiring/connectors, power/ground, exhaust installation, or a control-module interpretation issue. Parts access and required relearn/regeneration steps can also affect labor.

• Repair wiring faults: Restore damaged wiring, poor splices, pin fit issues, or chafing/heat damage in the DPF temperature sensor circuit.
• Clean and secure connectors: Remove corrosion/contamination, correct terminal tension, ensure locks/seals are intact, and fully seat connectors.
• Correct power/ground issues: Restore sensor feed, reference, and ground integrity as applicable (varies by vehicle design) and confirm low resistance/clean grounds.
• Replace the DPF temperature sensor (Bank 2 Sensor 4): Only after confirming the sensor signal is skewed, stuck, slow to respond, or out of plausible range compared to related temperature inputs.
• Repair exhaust mounting or routing issues: Fix conditions that stress the harness or sensor (heat shielding, retainers, or contact points) when they contribute to repeat range/performance faults.
• Address related thermal-sensor issues: Diagnose and repair other exhaust temperature sensors or related circuits if live data shows implausible correlation driving the range/performance judgment.
• Perform required service procedures: Clear codes, verify readiness, and complete any required adaptation/relearn or regeneration-related verification steps per service information.

Can I Still Drive With P2473?

You can often drive cautiously with P2473, but you should limit load and avoid extended high-speed or towing until it’s diagnosed, because the system may alter aftertreatment control when temperature feedback is not plausible. If you notice reduced power, severe drivability changes, overheating warnings, abnormal exhaust odor/smoke, or any brake/steering warning lights, do not continue driving and have the vehicle inspected promptly.

What Happens If You Ignore P2473?

Ignoring P2473 can lead to repeated warning lights, incomplete or inhibited aftertreatment strategies, reduced performance, and potentially higher exhaust temperatures or inefficient soot management depending on how the vehicle responds to unreliable temperature feedback. Over time this may contribute to additional diagnostic trouble codes and more complicated repairs, even if the original issue is only a circuit or connection problem.

Last updated: February 17, 2026

Vehicles Commonly Affected by P2473

• Vehicles equipped with a diesel particulate filter: Systems that monitor DPF temperatures for aftertreatment control.
• Applications with multiple exhaust temperature sensors: Platforms using several temperature inputs for correlation/plausibility checks.
• Vehicles with tight exhaust packaging: Higher likelihood of heat-related harness stress or connector degradation.
• High-mileage vehicles: Increased chance of terminal fretting, corrosion, and insulation hardening near the exhaust.
• Vehicles used for heavy-duty duty cycles: Frequent high-load operation that raises exhaust temperatures and stresses sensors/harnesses.
• Vehicles with recent exhaust service: Routing/clip issues or disturbed connectors can trigger range/performance behavior.
• Vehicles operated in wet/salty environments: Greater risk of connector corrosion affecting signal plausibility.
• Vehicles with prior wiring repairs: Splices or repairs near the exhaust can introduce resistance or intermittent contact.

For best results, verify the exact sensor location for “Bank 2 Sensor 4” and the manufacturer’s test procedure in the service information before replacing any parts.