P2468 – DPF Temperature Sensor Circuit Intermittent (Bank 1 Sensor 4)

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: Circuit Intermittent | Location: Bank 1, Sensor 4

Definition source: SAE J2012/J2012DA (industry standard)

DTC P2468 indicates the powertrain control module has detected an intermittent electrical signal condition in the DPF temperature sensor circuit identified as Bank 1 Sensor 4. “Intermittent” means the signal is not consistently wrong; it may drop out, spike, or momentarily become implausible due to wiring, connector, sensor, or module-side issues. How the vehicle detects and reports this fault can vary by vehicle, including which monitor runs, when it runs, and what warning indicators appear. Always confirm sensor location, circuit routing, and test procedures using the applicable service information.

What Does P2468 Mean?

P2468 means DPF Temperature Sensor Circuit Intermittent (Bank 1 Sensor 4). In other words, the control module has observed an unstable or momentary loss/return of the electrical signal from the specified diesel particulate filter (DPF) temperature sensor circuit, rather than a steady “high,” “low,” or “open” condition. The DTC structure is defined by SAE J2012, while the exact enabling conditions, monitor logic, and how Bank 1 Sensor 4 is designated can vary by vehicle and must be verified in service information.

Quick Reference

  • System: Powertrain
  • Official meaning: DPF Temperature Sensor Circuit Intermittent (Bank 1 Sensor 4)
  • Standard: ISO/SAE controlled
  • Fault type: Circuit Intermittent
  • Severity: The MIL may illuminate and the vehicle may limit certain emissions-related functions; drivability impact varies and may include reduced power depending on how the system responds.

Symptoms

  • MIL/Warning lamp: Check engine light illuminated, sometimes after an intermittent event rather than immediately.
  • Intermittent power reduction: Occasional reduced engine power or torque limiting if the system substitutes a default value.
  • Regeneration disruption: DPF regeneration may be delayed, interrupted, or inhibited due to unstable temperature feedback.
  • Unstable temperature data: Live data may show brief dropouts, spikes, or flickering for the Bank 1 Sensor 4 temperature reading.
  • Stored pending code: Code may appear as pending or history with freeze-frame data showing a short-duration fault.
  • Fuel economy change: Possible temporary efficiency decrease if regeneration strategy changes or defaults are used.
  • Inconsistent drivability complaint: Symptoms may come and go, often correlating with vibration, heat soak, or certain road conditions.

Common Causes

  • Connector contact issues: Loose terminal tension, corrosion, moisture intrusion, or partial connector disengagement at the DPF temperature sensor (Bank 1 Sensor 4) or at the control module.
  • Harness movement damage: Chafed, pinched, or stretched wiring near exhaust components, heat shields, brackets, or tie-down points causing intermittent opens/shorts as the engine moves.
  • Heat-related insulation breakdown: Wire insulation hardened or cracked from sustained exhaust heat, creating intermittent contact between conductors or to ground when hot.
  • Intermittent open in signal/return circuit: Broken conductor strands inside the insulation, poor splice/crimp, or internal terminal damage that opens with vibration.
  • Intermittent short-to-ground or short-to-power: Wire rub-through contacting metal or another circuit intermittently, skewing the sensor signal only under certain conditions.
  • Power/feed/ground intermittency: Unstable sensor supply, reference, or ground path (where applicable by design) due to shared grounds, ground eyelet looseness, or corroded junctions.
  • Sensor internal intermittency: DPF temperature sensor element or internal connections intermittently failing with temperature cycling or vibration.
  • Control module pin/connector concern: Backed-out pins, fretting, or poor pin fit at the control module causing intermittent circuit behavior.

Diagnosis Steps

Tools that help: a scan tool capable of viewing live data and freeze-frame, recording (logging) PIDs, and clearing codes; a digital multimeter for continuity and voltage-drop checks; back-probing pins and appropriate test leads; and basic hand tools to access connectors and harness routing. Depending on vehicle design, a wiring diagram/service information is essential to identify the correct Bank 1 Sensor 4 circuits, connector pinouts, and test points.

  1. Confirm the code and context: Retrieve stored and pending DTCs and save freeze-frame data. Note when the fault set (engine load, temperature, speed) because intermittents often correlate with heat soak, vibration, or specific operating ranges.
  2. Check for related faults first: Look for other DPF temperature sensor circuit codes, exhaust temperature sensor codes, reference/ground faults, or communication/power supply codes. Diagnose shared power/ground or harness issues that could cause multiple intermittent sensor faults.
  3. Identify the correct sensor and bank: Using service information, locate “DPF Temperature Sensor (Bank 1 Sensor 4)” and its connector. Verify you are on the correct sensor position because multiple exhaust temperature sensors may be present and visually similar.
  4. Perform a focused visual inspection: Inspect the sensor pigtail, connector lock, terminal seals, and harness routing near the exhaust/DPF. Look for melting, brittle insulation, rubbing points, crushed sections, or prior repair splices. Correct any obvious physical damage before deeper electrical testing.
  5. Inspect connectors and terminals: Disconnect the sensor and inspect for corrosion, moisture, bent pins, backed-out terminals, and poor pin fit. Lightly tug each wire at the rear of the connector to detect hidden breaks. Repair terminal issues as needed and ensure connectors fully seat and lock.
  6. Baseline live-data check: With the scan tool, monitor the DPF temperature sensor signal PID(s) associated with Bank 1 Sensor 4 at idle and during a brief, controlled RPM change. Look for dropouts, sudden spikes, implausible jumps, or a reading that intermittently disappears—hallmarks of an intermittent circuit.
  7. Wiggle test with logging: While logging live data, gently wiggle the sensor connector, pigtail, and harness segments along their route (especially near brackets and hot areas). If the PID drops out or spikes during movement, isolate the exact section that triggers the change to pinpoint the intermittent connection.
  8. Check power/ground integrity (as applicable): Using the wiring diagram, verify the sensor’s supply/reference and ground/return circuits where applicable. Perform voltage-drop testing on the ground path and any power feed under operating conditions (engine running if required). Excessive drop or instability indicates a resistance/connection problem rather than a sensor element issue.
  9. Continuity and intermittent open testing: With the circuit safely de-energized per service info, check continuity from the sensor connector to the control module pins for the signal and return circuits. Flex the harness while measuring to catch intermittent opens. If continuity comes and goes, locate the break, poor splice, or terminal fault.
  10. Short-to-ground/short-to-power checks: Test for unwanted continuity between the signal circuit and ground, and between the signal circuit and power/reference (per diagram). Move the harness while testing. An intermittent rub-through can test good when stationary but fail when flexed.
  11. Sensor substitution only after circuit verification: If the wiring, terminals, power/ground integrity, and shorts/opens tests are all stable, suspect the sensor itself as intermittent. Confirm by repeating the wiggle/heat-cycle checks at the sensor connector and comparing behavior before replacing parts.
  12. Verify the repair: Clear codes and perform a validation drive while logging the relevant temperature PID(s). Recheck for pending codes. Ensure the sensor signal remains stable through the conditions most likely to reproduce the fault (heat soak, vibration, and the operating range seen in freeze-frame).

Professional tip: Intermittent DPF temperature sensor circuit faults are often caused by terminal tension loss or harness damage near heat sources. If your wiggle test triggers a dropout, avoid immediately replacing the sensor—first isolate whether the change occurs when moving the connector body (terminal fit) versus moving the harness a few inches away (broken conductor/chafe). After repairs, secure routing and add abrasion/heat protection as appropriate to prevent recurrence.

Need wiring diagrams and factory-style repair steps?

Powertrain faults often require exact wiring diagrams, connector pinouts, and guided test steps. A repair manual can help you confirm the cause before replacing parts.

Factory repair manual access for P2468

Check repair manual access

Possible Fixes & Repair Costs

Repair costs for P2468 vary widely because the fault is intermittent and can be caused by anything from a loose connector to a damaged harness or a failed DPF temperature sensor. Accurate diagnosis, parts access, and labor time depend on vehicle layout and confirmed test results.

  • Repair connector issues: Clean corrosion, restore terminal tension, correct pin fit, and fully seat/lock the DPF temperature sensor connector (Bank 1 Sensor 4).
  • Harness repair: Repair or replace damaged wiring (chafing, heat damage, broken conductors) and restore proper routing/retention to prevent recurring intermittents.
  • Restore power/ground integrity: Repair the sensor feed or ground circuits as proven by testing, including addressing shared splices, damaged grounds, or high-resistance joints.
  • Address poor electrical contacts: Replace affected terminals, pigtails, or connector bodies when intermittent contact is confirmed under a wiggle test or vibration/heat.
  • Replace the DPF temperature sensor: Replace Bank 1 Sensor 4 only after verifying the circuit is stable and the sensor itself is the source of the intermittent signal.
  • Repair related circuit protection: Replace a failed fuse or repair a compromised circuit protection element only if testing confirms it is opening intermittently.
  • Verify after repair: Clear the DTC, run an appropriate drive cycle, and confirm no recurrence with live-data logging and a repeat wiggle/heat soak check.

Can I Still Drive With P2468?

You can often drive with P2468, but because it indicates an intermittent DPF temperature sensor circuit signal (Bank 1 Sensor 4), the control module may limit certain emissions-related functions and may command reduced power on some platforms. If you notice reduced power, unstable idle, warning lights escalating, or any safety-related symptoms such as stalling or no-start, do not continue driving; have the vehicle inspected and verify the circuit with service information.

What Happens If You Ignore P2468?

Ignoring P2468 can allow an intermittent electrical fault to worsen into a more consistent failure, increasing the chance of repeat warning lights and driveability changes. A persistently unreliable DPF temperature signal can also lead to improper control decisions for exhaust temperature management and regeneration strategy, potentially causing additional fault codes and longer-term emissions-system performance issues.

Compare nearby dpf temperature trouble codes with similar definitions, fault patterns, and diagnostic paths.

  • P2476 – DPF Temperature Sensor Circuit Intermittent (Bank 2 Sensor 4)
  • P2475 – DPF Temperature Sensor Circuit High (Bank 2 Sensor 4)
  • P2474 – DPF Temperature Sensor Circuit Low (Bank 2 Sensor 4)
  • P2473 – DPF Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 4)
  • P2472 – DPF Temperature Sensor Circuit (Bank 2 Sensor 4)
  • P2471 – DPF Temperature Sensor Circuit High (Bank 2 Sensor 3)

Key Takeaways

  • P2468 is an intermittent circuit fault: It points to an unstable electrical signal in the DPF temperature sensor circuit (Bank 1 Sensor 4), not a confirmed mechanical exhaust problem by itself.
  • Wiring and connectors are top suspects: Loose pins, corrosion, heat damage, and harness chafing are common roots of intermittent behavior.
  • Test under real conditions: Wiggle testing, voltage-drop checks, and live-data logging during vibration/heat soak are essential to catch intermittents.
  • Replace parts only with proof: Sensor replacement should follow confirmation that power, ground, and signal circuits are stable and the sensor is the source.
  • Verify the repair: Clear codes and confirm no recurrence through a complete drive cycle and recheck for signal stability.

Vehicles Commonly Affected by P2468

  • Diesel-equipped vehicles with a DPF: Applications using a diesel particulate filter and dedicated exhaust temperature sensing.
  • Light-duty trucks and vans: Vehicles with underbody exhaust routing exposed to heat, road debris, and vibration.
  • Commercial and fleet vehicles: High-mileage duty cycles that increase connector wear and harness movement over time.
  • Vehicles with tight exhaust packaging: Platforms where sensor wiring is routed close to hot components, increasing heat-related insulation and connector issues.
  • Vehicles frequently operated in wet/corrosive environments: Conditions that promote connector corrosion and intermittent terminal contact.
  • Vehicles used for short-trip operation: Operating patterns that can increase thermal cycling and condensation effects on connectors.
  • Vehicles with prior exhaust or underbody repairs: Repairs that may have altered harness routing, clip retention, or connector engagement.
  • Vehicles with recent battery/charging or electrical work: Any work that may have disturbed grounds, harnesses, or shared power feeds.

FAQ

Does P2468 mean the DPF is clogged?

No. P2468 specifically indicates an intermittent electrical condition in the DPF temperature sensor circuit (Bank 1 Sensor 4). A clogged DPF is a different type of condition and would require separate confirmation through appropriate diagnostics and service information.

What is “Bank 1 Sensor 4” for this code?

It identifies the specific DPF temperature sensor circuit location used by the control module for monitoring. The exact physical placement and naming convention vary by vehicle, so use service information to confirm which sensor is labeled Bank 1 Sensor 4 and where it is mounted.

Why is an intermittent circuit fault harder to diagnose than a hard fault?

Intermittent faults may only appear under certain conditions such as vibration, heat soak, moisture, or harness movement. The circuit can test normally when stationary, so diagnosis typically requires live-data logging, wiggle testing, and inspection for marginal terminal contact or heat-damaged wiring.

Should I replace the DPF temperature sensor right away?

Not automatically. Because P2468 is an intermittent circuit code, the most efficient approach is to first verify connector integrity, terminal fit, harness condition, and power/ground stability. Replace the sensor only if testing shows the sensor itself is producing the intermittent behavior with a known-good circuit.

Will clearing the code fix P2468?

Clearing the code only erases stored fault information; it does not correct the underlying intermittent circuit condition. If the cause remains, the DTC will typically return when operating conditions reproduce the intermittent signal, so verification testing after any repair is important.

For the most reliable results, confirm the sensor identification and circuit details for Bank 1 Sensor 4 in the correct service information, then validate the repair with a drive cycle and live-data logging to ensure the intermittent signal does not recur.