P2471 – DPF Temperature Sensor Circuit High (Bank 2 Sensor 3)

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: Circuit High | Location: Bank 2, Sensor 3

Definition source: SAE J2012/J2012DA (industry standard)

P2471 indicates the powertrain controller detected a high electrical input condition in the diesel particulate filter (DPF) temperature sensor circuit identified as Bank 2 Sensor 3. “Circuit High” points to an electrical/signal problem (such as a short to power, an open ground, or a biased reference) rather than confirming a DPF overheating or exhaust temperature issue by itself. How quickly the code sets, whether a warning lamp illuminates, and what backup strategy is used can vary by vehicle, so confirm the circuit layout, connector views, and test specifications in the correct service information.

What Does P2471 Mean?

P2471 – DPF Temperature Sensor Circuit High (Bank 2 Sensor 3) means the control module has determined the signal from the specified DPF temperature sensor circuit is higher than expected for the conditions it monitors. In SAE J2012 DTC structure, this is a powertrain diagnostic that flags an electrical “high input” fault type, typically associated with a short-to-voltage, an open in the sensor ground/return path, connector or terminal faults that raise the signal, or a sensor/circuit biasing issue. The code identifies the affected sensor location (Bank 2 Sensor 3) to narrow circuit testing.

Quick Reference

• System: Powertrain
• Official meaning: DPF Temperature Sensor Circuit High (Bank 2 Sensor 3)
• Standard: ISO/SAE controlled
• Fault type: Circuit High
• Severity: MIL illumination is possible; the controller may limit certain exhaust aftertreatment functions and can command reduced power depending on vehicle strategy.

Symptoms

• Malfunction indicator: Check engine/MIL may illuminate or a powertrain warning may be displayed.
• Reduced power: Engine torque may be limited if the controller enters a protective strategy related to aftertreatment temperature monitoring.
• Regeneration changes: DPF regeneration may be inhibited, delayed, or controlled differently due to unreliable temperature feedback.
• Fuel economy: Fuel consumption may increase if the system compensates for uncertain exhaust temperature information.
• Driveability: Hesitation, sluggish response, or inconsistent performance may occur during operating modes that rely on aftertreatment temperature control.
• Cooling fan behavior: Fans may run more than expected on some platforms as a protective response to perceived high temperature signals.

Common Causes

• Short-to-power on signal circuit: Damaged insulation or pin contact allowing the sensor signal to be pulled high.
• Open or high-resistance ground: Broken ground wire, poor ground splice, or loose ground point causing the signal to float high.
• Connector issues: Corrosion, moisture intrusion, spread terminals, poor pin fit, or partially latched connector at the sensor or harness side.
• Harness damage near heat sources: Chafing or melting from routing near exhaust/aftertreatment components leading to unintended contact with powered circuits.
• Sensor internal fault: DPF temperature sensor (Bank 2 Sensor 3) biased high due to internal electrical failure (confirm with testing).
• Reference/feed circuit fault: Shared reference or pull-up/feed circuit shorted high (design varies by vehicle) affecting the sensor circuit reading.
• Control module terminal/driver concern: Bent pins, backed-out terminals, or internal module fault causing an erroneously high interpreted input (verify only after circuit checks).
• Aftermarket wiring modifications: Non-factory splices, add-on devices, or repairs that introduce incorrect power/ground relationships.

Diagnosis Steps

Tools typically needed include a scan tool capable of reading live data and freeze-frame, a digital multimeter, and back-probing supplies. Having wiring diagrams and connector pinouts from service information is essential because circuit design and shared references vary by vehicle. If available, use a breakout lead or test harness to avoid damaging terminals, plus basic hand tools for access and visual inspection.

1. Confirm the code and context: Scan all modules and record P2471 along with any other DTCs. Save freeze-frame data and note whether the fault is current or history, and whether it sets immediately on key-on or only when running.
2. Review live data related to the DPF temperature sensor: Monitor the DPF temperature sensor (Bank 2 Sensor 3) PID and compare its behavior to related exhaust/aftertreatment temperature PIDs (if equipped). Look for a fixed/unrealistic high reading or a value that does not respond to operating changes.
3. Perform a thorough visual inspection: With the engine off and cooled as needed, inspect the sensor body and harness routing. Pay close attention to areas near hot components and sharp edges for melted insulation, chafing, or contact with other wiring.
4. Inspect connectors and terminals: Disconnect the sensor connector and the corresponding harness connector (as applicable). Check for corrosion, moisture, bent pins, pushed-back terminals, and poor terminal tension. Repair terminal fit issues before further electrical testing.
5. Check for a short-to-power on the signal circuit: Using the wiring diagram, identify the signal wire. With the connector disconnected (and circuits safely isolated per service information), test whether the signal circuit shows continuity to a power feed that it should not be connected to. If it does, trace and repair the harness fault.
6. Verify ground integrity with voltage-drop testing: If the sensor uses a ground circuit, load the circuit as directed by service information and perform a voltage-drop test from the sensor ground terminal to a known good ground. Excessive drop indicates an open/high-resistance ground path that can drive the input high.
7. Check reference/feed circuit behavior (if used): If the circuit uses a reference or pull-up/feed (design varies by vehicle), verify it is present and stable per service information. An incorrectly high feed or a shared circuit fault can bias the sensor input high.
8. Wiggle test while logging data: Reconnect as appropriate and log live data while gently flexing the harness and connectors from the sensor back toward the main loom and module. If the reading spikes high or the DTC resets during movement, isolate the location and repair the intermittent connection.
9. Sensor substitution/verification test: If wiring, connectors, power, and ground check out, verify the sensor itself per service procedures (varies by vehicle). If the sensor fails the specified checks, replace it and ensure correct installation and connector sealing.
10. Module-side circuit verification: If the circuit tests good up to the control module connector, inspect module terminals for damage, backing out, or corrosion. Only after all external circuit faults are eliminated should an internal control module issue be considered.
11. Clear codes and run a verification drive: Clear DTCs, then perform the drive cycle or functional test specified in service information. Confirm P2471 does not return and that the sensor PID responds plausibly under changing operating conditions.

Professional tip: A “circuit high” fault is often caused by an open ground or a signal wire that is unintentionally pulled up by a powered circuit. Prioritize connector terminal tension checks and voltage-drop testing under load rather than relying only on continuity checks, and always log live data during a wiggle test to capture brief spikes that may not set a code every time.

Possible Fixes & Repair Costs

Repair costs for P2471 vary widely by vehicle and depend on what testing reveals, component access, harness condition, and whether related wiring faults are present. Confirm the root electrical cause first, then replace or repair only what the diagnostics prove is faulty.

• Repair connector issues: Clean corrosion, correct terminal tension, repair bent pins, and ensure the DPF temperature sensor connector is fully seated and strain-relieved.
• Harness repair: Locate and repair chafed, pinched, or melted wiring; restore proper routing and shielding where applicable.
• Fix short-to-power: If the signal circuit is contacting a power feed, isolate the contact point and repair insulation or replace the affected section of loom.
• Restore grounds: Repair open or high-resistance ground paths (including shared sensor grounds) and verify ground integrity under load.
• Restore reference/supply integrity: If the sensor uses a dedicated feed/reference, correct opens, poor splices, or high-resistance connections affecting that circuit.
• Replace the DPF temperature sensor: Replace Bank 2 Sensor 3 only after wiring and connector checks confirm the circuit is capable of correct operation.
• Module-side circuit repair: If testing indicates an issue at the control module pin or internal driver (varies by vehicle), repair the terminal fit or address the module/circuit as directed by service information.

Can I Still Drive With P2471?

You can sometimes drive with P2471, but treat it cautiously because an electrical “circuit high” fault in the DPF temperature sensor circuit can cause incorrect exhaust temperature feedback, which may trigger reduced power strategies and affect emissions system operation. If you notice severe reduced power, flashing MIL, abnormal exhaust smell/heat, warning messages, or any stalling/no-start condition, do not continue driving—have the vehicle diagnosed promptly.

What Happens If You Ignore P2471?

Ignoring P2471 can lead to persistent MIL illumination, failed emissions inspections, and improper control of exhaust aftertreatment functions that depend on accurate temperature feedback. Over time, incorrect temperature input may contribute to poor regeneration management, increased soot loading, reduced fuel economy, and the possibility of additional powertrain fault codes as the system compensates for unreliable sensor circuit data.

Last updated: February 17, 2026

Vehicles Commonly Affected by P2471

• Diesel-equipped vehicles with a DPF system: Applications that monitor DPF temperatures using multiple sensors.
• Vehicles with multiple exhaust banks: Configurations where “Bank 2” applies (varies by vehicle layout).
• Vehicles using a dedicated DPF temperature sensor: Bank 2 Sensor 3 placement varies by exhaust design.
• High-heat duty-cycle vehicles: Frequent towing/haul use or sustained high-load operation that increases exhaust system temperatures.
• Vehicles operated in harsh environments: Road salt, water intrusion, or debris exposure that accelerates connector/corrosion issues.
• Vehicles with prior exhaust or aftertreatment service: Disturbed routing, pinched harnesses, or misconnected plugs after repairs (varies by vehicle).
• Vehicles with underbody harness exposure: Longer or more exposed sensor wiring runs susceptible to chafing.
• High-mileage vehicles: Age-related connector fretting, insulation breakdown, and terminal tension loss.

For the most reliable outcome, base repairs on a confirmed electrical test result (wiring, power/ground integrity, and sensor response) rather than replacing components based solely on the presence of P2471.