Diesel Trouble Codes

P0546 — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1 (6.4 Power Stroke)

Diagnostic reference for 6.4L Power Stroke 2008-2010. Platform facts are authoritative and override any conflicting source. Rank causes most-likely first.

Updated September 2, 2026

What it means

The PCM has detected that the exhaust gas temperature sensor circuit on bank 1 sensor 1 is reporting a signal outside the expected range or performance. On the 6.4L Power Stroke, EGT sensors are used around the DOC/DPF for regeneration control.1

Most likely causes

  1. EGT sensor 1 (Bank 1 Sensor 1) internal drift/failure or wiring/connector damage causing out-of-range signal — The generic definition is a circuit range/performance fault for the exhaust gas temperature sensor on bank 1 sensor 1. Ford has issued a recall to replace the exhaust gas temperature sensor on affected 6.4L trucks.12
  2. Exhaust system heat damage to EGT sensor harness/connector near DOC/DPF — EGT sensors are located around the DOC/DPF for regen control on this platform. Heat and vibration can degrade wiring/connectors, producing range/performance readings.1
  3. PCM detecting implausible temperature due to recent DPF regeneration anomalies or excessive hydrocarbons affecting sensor readings — The 6.4 uses DOC+DPF with active regeneration via in-cylinder late post-injection. Excessive hydrocarbons can cause excessive DPF temperatures.13
  4. Related aftertreatment fault causing temperature excursions that trigger range/performance monitoring — DPF-related codes that apply to this platform include P2002, P244A, P244B, P2463, P2459, P246C. Temperature excursions from DPF issues can influence EGT sensor plausibility.1

How to diagnose

  1. Verify freeze-frame and confirm P0546 is present with EGT 1 data; check for accompanying DPF/regen codes (P2002, P244A/P244B, P2463, P2459, P246C) per platform facts.
  2. Inspect EGT sensor 1 wiring, connector, and routing for heat damage, chafing, corrosion, or oil contamination near DOC/DPF.
  3. Compare live EGT 1 readings to adjacent EGT sensors during idle and controlled warm-up; look for stuck, erratic, or out-of-range values versus expected temperature progression.
  4. Check for Technical Service Bulletins/recalls for EGT sensor replacement on 6.4L trucks; Ford recall campaign 13S10 involves replacing the exhaust gas temperature sensor.
  5. If sensor and wiring test normal, evaluate recent regeneration behavior and DPF health (soot load, delta-P) because excessive hydrocarbons/DPF temperature events can affect EGT plausibility.

Parts and tools you may need

Rough cost and difficulty

Parts and labor vary by region and shop. NHTSA owner reports cite high repair costs for unrelated 6.4 failures (e.g., high-pressure fuel pump repairs quoted near $10k–$13k). Use those as general cost context only; EGT sensor replacement cost will differ.

When to see a pro

If diagnosis points to harness repair near hot exhaust, DPF/regen system faults, or PCM reprogramming, have a qualified diesel technician perform the work. Do not attempt step-by-step repair of safety-critical systems. NHTSA complaints describe sudden power loss events on 6.4 trucks. Seek professional diagnosis promptly.

Sources

  1. Curated DTC seed — 6.4 Power Stroke (curated) ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

  2. NHTSA owner report 10644933 ↩︎

  3. NHTSA ↩︎