6.7L Power Stroke Diagnostics

The 6.7L Power Stroke has powered Ford Super Duty trucks since the 2011 model year. These guides cover the codes and symptoms owners run into most: turbo and boost faults, EGR and DPF issues, hard starting, and limp-mode triggers.

Guides are being published on a rolling schedule.

• P0016 — Crankshaft/Camshaft Position Correlation (Bank 1 Sensor A) (6.7 Power Stroke) Diagnostic reference for P0016 on 6.7 Powerstroke. Use only the provided sources for factual claims.
• P0087 — Fuel Rail/System Pressure Too Low (6.7 Power Stroke) Measured fuel rail pressure is below the PCM's commanded value on the 6.7 Powerstroke. Diagnose fuel delivery and high-pressure pump health before condemning components.
• P0088 — Fuel Rail/System Pressure Too High (6.7 Power Stroke) Measured fuel rail pressure exceeds the commanded value. Typical on this platform: often a fuel pressure control valve or rail pressure sensor fault.
• P008A — Low Pressure Fuel System Pressure Too Low (6.7 Power Stroke) Diagnostic reference for 6.7 Powerstroke P008A. Use only the provided sources for factual claims.
• P0100 — Mass or Volume Air Flow Circuit Malfunction (6.7 Power Stroke) A concise, source-backed diagnostic reference for P0100 on the 6.7 Powerstroke. Focuses on intake and sensor circuit faults, how to confirm them, and what to inspect next. No step-by-step repair of safety-critical systems.
• P0107 — Manifold Absolute Pressure/Barometric Pressure Circuit Low (6.7 Power Stroke) P0107 means the PCM sees the MAP/BARO sensor signal below the valid range on a 6.7 Powerstroke. The code is defined under SAE J2012 and affects intake, sensors, and boost control. Typical platform causes are the MAP sensor, its connector, or wiring; the fault can affect boost control. Diagnosis focuses on verifying the sensor signal and circuit integrity before assuming mechanical boost issues.
• P0128 — Coolant Thermostat Below Regulating Temperature (6.7 Power Stroke) P0128 on a 6.7 Powerstroke means the engine coolant is not reaching the expected operating temperature in the expected time. The code is defined under SAE J2012 as generic OBD-II and the affected system is cooling. On this platform the typical cause is a stuck-open thermostat.
• P0234 — Turbocharger/Supercharger Overboost Condition (6.7 Power Stroke) P0234 on 6.7 Powerstroke means boost pressure has exceeded the maximum allowed for current conditions. Diagnose boost control and sensor accuracy before assuming mechanical failure.
• P0263 — Cylinder 1 Contribution/Balance Fault (6.7 Power Stroke) Diagnostic reference for P0263 on 6.7 Powerstroke. Use only to diagnose; do not perform step-by-step repair of safety-critical systems.
• P0299 — Turbocharger/Supercharger Underboost Condition (6.7 Power Stroke) P0299 on 6.7 Powerstroke means boost pressure is below the minimum expected for current conditions. Diagnose by confirming underboost, then checking the most likely boost-path and VGT control faults before condemning the turbo.
• P0401 — Exhaust Gas Recirculation Flow Insufficient (6.7 Power Stroke) Diagnostic reference for P0401 on 6.7 Powerstroke. Use only to diagnose; do not perform step-by-step repair of safety-critical systems.
• P0402 — Exhaust Gas Recirculation Flow Excessive (6.7 Power Stroke) Diagnostic reference for P0402 on the 6.7 Powerstroke. Use only to diagnose; do not perform step-by-step repair of safety-critical systems.
• P0420 — Catalyst System Efficiency Below Threshold (6.7 Power Stroke) Diagnostic reference for 6.7 Powerstroke P0420. Use only the provided sources for factual claims.
• P042E — Exhaust Gas Recirculation Control Stuck Open (6.7 Power Stroke) Diagnostic reference for 6.7 Powerstroke P042E. Use only to diagnose EGR system faults; do not perform step-by-step repair of safety-critical systems.
• P046C — Exhaust Gas Recirculation Position Sensor Circuit Range/Performance (6.7 Power Stroke) Diagnostic reference for P046C Exhaust Gas Recirculation Position Sensor Circuit Range/Performance on 6.7 Powerstroke.
• P0470 — Exhaust Pressure Sensor Malfunction (6.7 Power Stroke) P0470 indicates the exhaust back-pressure sensor signal is out of range or implausible on the 6.7 Powerstroke. The code is tied to the exhaust/DPF system and typically points to sensor, tubing, or wiring issues affecting pressure feedback used for regeneration control.
• P0500 — Vehicle Speed Sensor A Malfunction (6.7 Power Stroke) Concise diagnostic reference for P0500 on 6.7 Powerstroke. Focuses on diagnosis of vehicle-speed signal loss, prioritized by likelihood. No step-by-step repair of safety-critical systems.
• P0670 — Glow Plug Control Module Circuit (6.7 Power Stroke) P0670 on the 6.7 Powerstroke means the PCM has detected a fault in the glow-plug control module circuit. Affected systems are glow plugs and cold start. Typical on this platform: glow-plug control module, harness, or an individual glow plug/circuit.
• P1000 — OBD-II Monitor Testing Not Complete (6.7 Power Stroke) Informational code on 6.7 Powerstroke indicating readiness monitors have not finished since the last code clear or battery disconnect. Typical on this platform: informational; complete a drive cycle.
• P2002 — Diesel Particulate Filter Efficiency Below Threshold (Bank 1) (6.7 Power Stroke) Diagnostic reference for P2002 on 6.7 Powerstroke. Use only the provided sources for factual claims.
• P204F — Reductant System Performance (6.7 Power Stroke) P204F means the SCR/DEF system is not achieving expected NOx reduction on the 6.7 Powerstroke. Diagnose by confirming reductant quality/delivery and NOx sensor feedback; do not service high-pressure fuel or brake systems.
• P20E8 — Reductant Pressure Too Low (6.7 Power Stroke) Diagnostic reference for P20E8 on 6.7 Powerstroke. Use only the provided sources for factual claims.
• P2263 — Turbocharger/Supercharger Boost System Performance (6.7 Power Stroke) Actual boost does not track desired boost over a range of conditions on 6.7 Powerstroke.
• P226C — Turbocharger/Supercharger Boost Control A Position Exceeded Learning Limit (6.7 Power Stroke) Diagnostic reference for 6.7 Powerstroke P226C. Use only the provided sources for factual claims.
• P2280 — Air Flow Restriction / Air Leak Between Air Filter and MAF (6.7 Power Stroke) P2280 on a 6.7 Powerstroke means the PCM has detected an intake restriction or unmetered air leak upstream of the MAF sensor. The code is defined under SAE J2012 as an intake restriction or unmetered air leak detected upstream of the sensor.
• P2452 — Diesel Particulate Filter Pressure Sensor A Circuit (6.7 Power Stroke) P2452 is a generic OBD-II code for a DPF differential-pressure sensor circuit fault on the 6.7 Powerstroke. It indicates an electrical or signal problem with Sensor A rather than a confirmed DPF restriction.
• P2453 — Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance (6.7 Power Stroke) Diagnostic reference for 6.7 Powerstroke P2453. Use only the provided sources for factual claims.
• P2459 — Diesel Particulate Filter Regeneration Frequency (6.7 Power Stroke) P2459 on 6.7 Powerstroke means regenerations are occurring more often than expected. Diagnose why soot load is high or regeneration control is being triggered excessively.
• P2470 — Exhaust Gas Temperature Sensor Circuit Range/Performance (bank 1 sensor 3) (6.7 Power Stroke) Diagnostic reference for P2470 on 6.7 Powerstroke. Use only for diagnosis; do not perform step-by-step repair of safety-critical systems.