In the world of diesel performance cars, the Ford 6.7L Powerstroke is renowned for its wild torque and reliability, but its complex electronic monitoring system often leaves owners bewildered by the 'malfunction light maze'. From the common P0299 underboost to the daunting P207F urea quality issue, each code hides a crucial mechanical signal. To help the TruckTok community members troubleshoot accurately, we've compiled a comprehensive DTC (Driving Troubleshooting Code) dictionary covering fuel, intake, aftertreatment, and communication systems. We recommend saving this; it might be your most needed 'survival manual' on your next towing trip.
1. Fuel System (P00xx) For high-pressure common rail, CP4 pump, and pressure regulator (VCV/PCV).
P0087: Rail Pressure Too Low – Focus on this.
P0088: Rail Pressure Too High.
P0089: Fuel pressure regulator performance issue.
P0090: Fuel pressure regulator control circuit open circuit.
P0091: Fuel pressure regulator control circuit low level.
P0092: Fuel pressure regulator control circuit high level.
P0093: Large-area fuel system leak detected.
P0094: Small-area fuel system leak detected.
P008A: Low-pressure fuel system pressure too low.
P008B: Low-pressure fuel system pressure too high.
2. Intake, Turbo & Injectors - P01xx / P02xx This section covers the MAF (Flow Meter), sensors, turbo actuators, and fuel injectors 1-8.
P0101: MAF (Flow Meter) circuit range/performance.
P0102: MAF sensor circuit input too low.
P0103: MAF sensor circuit input too high.
P0112/P0113: Intake Air Temperature (IAT) sensor circuit low/high.
P0191: Fuel Distributor Pressure (FRP) sensor range/performance.
P0192/P0193: FRP sensor circuit low/high.
P0234: Turbocharger Overboost.
P0236: Boost Pressure sensor range/performance.
P0299: Underboost – This code is always reported when a 6.7L turbocharger pipe bursts.
P0263, P0266, P0269, P0272, P0275, P0278, P0281, P0284: Contribution/balance fault in cylinders 1-8 (check here to determine which injector is faulty).
3. Exhaust Gas Recirculation (EGR System - P04xx) This is the most frequently addressed section in modifications, involving the EGR valve and flow monitoring.
P0401: Insufficient EGR Flow – Usually caused by a clogged EGR cooler.
P0402: Excessive EGR Flow.
P0403: EGR control circuit fault.
P0404: EGR circuit range/performance.
P0405/P0406: EGR sensor A circuit low/high.
P042E: EGR controller stuck in the ON position.
P042F: EGR controller stuck in the OFF position.
P0470: Exhaust back pressure (EBP) sensor circuit fault.
P0471: EBP sensor range/performance.
P0472/P0473: EBP sensor circuit low/high.
4. Reductant/Urea System (SCR & DEF - P20xx / P21xx)
These codes typically relate to the DEF pump, heater, and injector, and are common faults in 6.7L tanks in cold climates.
P207F: Reductant Quality Performance Abnormality – Commonly known as "Urea Failure," this is the most likely code to trigger a speed limit.
P20E8: Reductant Pressure Too Low – Check if the DEF pump is working or if the lines are leaking/iced.
P20E9: Reductant Pressure Too High.
P20BA: Reductant Heater A Control Circuit Performance – A common problem, usually caused by a burnt-out heating element in the urea tank.
P20BD: Reductant Heater B Control Circuit Performance.
P2047: Reductant Injector Circuit Open Circuit (Bank 1 Unit 1).
P205C: Reductant tank temperature sensor circuit low level.
P20EE: SCR NOx catalytic efficiency below threshold (Bank 1) – This indicates the SCR catalytic converter may be poisoned or malfunctioning.
P21B0: Reductant level sensor center circuit malfunction.
P2201: NOx (Nitrogen Oxides) sensor 1 circuit range/performance (located before SCR).
P229E: NOx sensor 2 circuit failure (located after SCR).
5. DPF & Exhaust Pressure (DPF & Exhaust Pressure - P24xx) Involves exhaust back pressure, differential pressure sensor, and carbon buildup monitoring.
P242F: DPF Limit - Ash Accumulation – This indicates the DPF is physically clogged and cannot be restored through regular regeneration.
P2463: Excessive DPF Soot Accumulation – Manual forced regeneration is required.
P246C: DPF Limit - Forced Power Limitation — The vehicle enters "limp mode" to protect the engine.
P2452: DPF Pressure Sensor A Circuit.
P2453: DPF Pressure Sensor A Circuit Range/Performance — This code is very likely to appear if a non-original DPF has been replaced.
P244A: DPF Differential Pressure Too Low — Check if the DPF is cracked or if the sensor hose is detached.
P24A4: DPF Limit - Excessive Carbon Deposits (Group 1).
6. EGT Exhaust Temperature Sensor (Exhaust Gas Temp - P24xx)
The 6.7L exhaust pipe has 4 to 5 EGT sensors, with a very high failure rate.
P242A: EGT Sensor Circuit (Bank 1 Sensor 3).
P242B: EGT Sensor Circuit Range/Performance (Bank 1 Sensor 3).
P242C: EGT sensor circuit low level (Bank 1 Sensor 3).
P242D: EGT sensor circuit high level (Bank 1 Sensor 3) — Common fault, default error after sensor open circuit.
P20E2: EGT sensor 1/2 correlation abnormality.
P0544: EGT sensor 1 circuit (Bank 1).
P0546: EGT sensor 1 circuit high level.
7. Transmission System (6R140/10R140 Transmission - P07xx) This involves the 6.7L heavy-duty transmission, focusing on the solenoids and shift logic.
P0700: Transmission control system malfunction (General Request Code, indicating TCM read).
P0706/P0707: Transmission gear position sensor range/performance (or circuit low).
P0711/P0712: Transmission oil temperature sensor (TFT) performance/circuit low.
P0720/P0722: Output shaft speed sensor (OSS) circuit malfunction/no signal.
P0731 - P0736: Incorrect gear ratios for 1st-6th gears (or 1st-10th gears) (slippage or clutch malfunction).
P0741: Torque converter clutch (TCC) circuit malfunction or stuck in the closed position.
P0750 - P0770: Shift solenoid valves A, B, C, D, E are malfunctioning or have an open circuit.
P0960/P0962: Pressure control solenoid valve A control circuit is open/low level.
P2700 - P2705: Gearbox friction element A-F shift time is out of range.
8. Control Module and Power Supply (PCM, TCM & Power - P06xx) This part of the codes directly relates to the health status of the ECU.
P0600: Serial communication link failure.
P0603: PCM Live Memory (KAM) error (usually caused by power failure or re-flashing).
P0604: Control module Random Access Memory (RAM) error.
P0606: PCM processor failure (serious internal hardware error).
P0607: Control module performance problem.
P062D: Injector drive control module circuit performance (Bank 1).
P0641/P0651: Sensor reference voltage A/B circuit open circuit (if a sensor is short-circuited, it will pull down the entire 5V reference voltage loop).
P0670 - P0678: Glow plug control circuit/glow plug circuit 1-8 fault.
P068A: PCM relay deactivates prematurely (usually due to low battery voltage or burnt relay contacts).
9. Network Communication Failure (Network/Communication - U-Codes) When modules "lose communication," codes starting with U will be reported. This is crucial for troubleshooting wiring harness wear.
U0100: Loss of communication with PCM.
U0101: Loss of communication with TCM.
U010E: Loss of communication with Reductant Control Module.
U0121: Loss of communication with the Anti-lock Braking System (ABS).
U029D: Loss of communication with NOx sensor A.
U029E: Loss of communication with NOx sensor B.
U0401: Invalid data received from the PCM (usually due to communication interference or program version mismatch).
U0452: Invalid data received from the Restraint Control Module.
U3003: Module input voltage low.
10. Chassis, Braking, and Steering Systems (Cxxxx) This involves ABS, electronic parking brake, traction control, and power steering.
C0020: ABS pump motor control circuit fault.
C0031 / C0034: Left front/right front wheel speed sensor circuit fault.
C0040: Brake pedal position sensor circuit fault (directly affects cruise control and brake lights).
C1107: ABS function disabled (usually accompanied by missing U0121 module).
C1223: Deceleration sensor circuit fault.
C2100: Electronic parking brake (EPB) system circuit fault.
C0051: Steering angle sensor (SAS) target setting error (may require recalibration after four-wheel alignment).
11. Body & Safety Controls (Bxxxx) This involves airbags, door modules, lighting, and anti-theft systems.
B10A2: Collision input sensor malfunction (involves post-accident safety cutoff).
B1182: Tire Pressure Monitoring System (TPMS) malfunction.
B1218: Passenger seatbelt pretensioner control circuit malfunction.
B1353: Ignition key circuit malfunction (may cause starting failure).
B1D01: Right low beam headlight circuit malfunction.
B1596: Service interval timer error (usually disappears after manually resetting the service light).
B1048: Passenger side rear window lift control.
12. Cooling, Air Conditioning, and PTO Assistance (Auxiliary Systems) For heavy-duty work vehicles like the 6.7L, the PTO and cooling systems are critical.
P0128: Coolant Temp Below Regulating Temp – Common, the thermostat is stuck in the open position.
P0480: Fan 1 control circuit malfunction (involves cooling performance under heavy loads). P0528: Fan Speed Sensor No Signal.
P0532: Air Conditioning Pressure Sensor Circuit Low Level.
P0691: Fan 1 Control Circuit Low Level.
P253D: Auxiliary Power Output (PTO) Enable Circuit High Level (for vehicles equipped with tippers, booms, etc.).
P2610: PCM Internal Engine Shutdown Timer Malfunction (May Affect Regeneration Logic).
13. Special Combinations and Mixed Codes (P0Axx / P0Cxx)
P0A09: DC/DC Converter Status Circuit Low.
P0C29: Electric Drive Pump Control Module Performance Issues.
1. Fuel System (P00xx) For high-pressure common rail, CP4 pump, and pressure regulator (VCV/PCV).
P0087: Rail Pressure Too Low – Focus on this.
P0088: Rail Pressure Too High.
P0089: Fuel pressure regulator performance issue.
P0090: Fuel pressure regulator control circuit open circuit.
P0091: Fuel pressure regulator control circuit low level.
P0092: Fuel pressure regulator control circuit high level.
P0093: Large-area fuel system leak detected.
P0094: Small-area fuel system leak detected.
P008A: Low-pressure fuel system pressure too low.
P008B: Low-pressure fuel system pressure too high.
2. Intake, Turbo & Injectors - P01xx / P02xx This section covers the MAF (Flow Meter), sensors, turbo actuators, and fuel injectors 1-8.
P0101: MAF (Flow Meter) circuit range/performance.
P0102: MAF sensor circuit input too low.
P0103: MAF sensor circuit input too high.
P0112/P0113: Intake Air Temperature (IAT) sensor circuit low/high.
P0191: Fuel Distributor Pressure (FRP) sensor range/performance.
P0192/P0193: FRP sensor circuit low/high.
P0234: Turbocharger Overboost.
P0236: Boost Pressure sensor range/performance.
P0299: Underboost – This code is always reported when a 6.7L turbocharger pipe bursts.
P0263, P0266, P0269, P0272, P0275, P0278, P0281, P0284: Contribution/balance fault in cylinders 1-8 (check here to determine which injector is faulty).
3. Exhaust Gas Recirculation (EGR System - P04xx) This is the most frequently addressed section in modifications, involving the EGR valve and flow monitoring.
P0401: Insufficient EGR Flow – Usually caused by a clogged EGR cooler.
P0402: Excessive EGR Flow.
P0403: EGR control circuit fault.
P0404: EGR circuit range/performance.
P0405/P0406: EGR sensor A circuit low/high.
P042E: EGR controller stuck in the ON position.
P042F: EGR controller stuck in the OFF position.
P0470: Exhaust back pressure (EBP) sensor circuit fault.
P0471: EBP sensor range/performance.
P0472/P0473: EBP sensor circuit low/high.
4. Reductant/Urea System (SCR & DEF - P20xx / P21xx)
These codes typically relate to the DEF pump, heater, and injector, and are common faults in 6.7L tanks in cold climates.
P207F: Reductant Quality Performance Abnormality – Commonly known as "Urea Failure," this is the most likely code to trigger a speed limit.
P20E8: Reductant Pressure Too Low – Check if the DEF pump is working or if the lines are leaking/iced.
P20E9: Reductant Pressure Too High.
P20BA: Reductant Heater A Control Circuit Performance – A common problem, usually caused by a burnt-out heating element in the urea tank.
P20BD: Reductant Heater B Control Circuit Performance.
P2047: Reductant Injector Circuit Open Circuit (Bank 1 Unit 1).
P205C: Reductant tank temperature sensor circuit low level.
P20EE: SCR NOx catalytic efficiency below threshold (Bank 1) – This indicates the SCR catalytic converter may be poisoned or malfunctioning.
P21B0: Reductant level sensor center circuit malfunction.
P2201: NOx (Nitrogen Oxides) sensor 1 circuit range/performance (located before SCR).
P229E: NOx sensor 2 circuit failure (located after SCR).
5. DPF & Exhaust Pressure (DPF & Exhaust Pressure - P24xx) Involves exhaust back pressure, differential pressure sensor, and carbon buildup monitoring.
P242F: DPF Limit - Ash Accumulation – This indicates the DPF is physically clogged and cannot be restored through regular regeneration.
P2463: Excessive DPF Soot Accumulation – Manual forced regeneration is required.
P246C: DPF Limit - Forced Power Limitation — The vehicle enters "limp mode" to protect the engine.
P2452: DPF Pressure Sensor A Circuit.
P2453: DPF Pressure Sensor A Circuit Range/Performance — This code is very likely to appear if a non-original DPF has been replaced.
P244A: DPF Differential Pressure Too Low — Check if the DPF is cracked or if the sensor hose is detached.
P24A4: DPF Limit - Excessive Carbon Deposits (Group 1).
6. EGT Exhaust Temperature Sensor (Exhaust Gas Temp - P24xx)
The 6.7L exhaust pipe has 4 to 5 EGT sensors, with a very high failure rate.
P242A: EGT Sensor Circuit (Bank 1 Sensor 3).
P242B: EGT Sensor Circuit Range/Performance (Bank 1 Sensor 3).
P242C: EGT sensor circuit low level (Bank 1 Sensor 3).
P242D: EGT sensor circuit high level (Bank 1 Sensor 3) — Common fault, default error after sensor open circuit.
P20E2: EGT sensor 1/2 correlation abnormality.
P0544: EGT sensor 1 circuit (Bank 1).
P0546: EGT sensor 1 circuit high level.
7. Transmission System (6R140/10R140 Transmission - P07xx) This involves the 6.7L heavy-duty transmission, focusing on the solenoids and shift logic.
P0700: Transmission control system malfunction (General Request Code, indicating TCM read).
P0706/P0707: Transmission gear position sensor range/performance (or circuit low).
P0711/P0712: Transmission oil temperature sensor (TFT) performance/circuit low.
P0720/P0722: Output shaft speed sensor (OSS) circuit malfunction/no signal.
P0731 - P0736: Incorrect gear ratios for 1st-6th gears (or 1st-10th gears) (slippage or clutch malfunction).
P0741: Torque converter clutch (TCC) circuit malfunction or stuck in the closed position.
P0750 - P0770: Shift solenoid valves A, B, C, D, E are malfunctioning or have an open circuit.
P0960/P0962: Pressure control solenoid valve A control circuit is open/low level.
P2700 - P2705: Gearbox friction element A-F shift time is out of range.
8. Control Module and Power Supply (PCM, TCM & Power - P06xx) This part of the codes directly relates to the health status of the ECU.
P0600: Serial communication link failure.
P0603: PCM Live Memory (KAM) error (usually caused by power failure or re-flashing).
P0604: Control module Random Access Memory (RAM) error.
P0606: PCM processor failure (serious internal hardware error).
P0607: Control module performance problem.
P062D: Injector drive control module circuit performance (Bank 1).
P0641/P0651: Sensor reference voltage A/B circuit open circuit (if a sensor is short-circuited, it will pull down the entire 5V reference voltage loop).
P0670 - P0678: Glow plug control circuit/glow plug circuit 1-8 fault.
P068A: PCM relay deactivates prematurely (usually due to low battery voltage or burnt relay contacts).
9. Network Communication Failure (Network/Communication - U-Codes) When modules "lose communication," codes starting with U will be reported. This is crucial for troubleshooting wiring harness wear.
U0100: Loss of communication with PCM.
U0101: Loss of communication with TCM.
U010E: Loss of communication with Reductant Control Module.
U0121: Loss of communication with the Anti-lock Braking System (ABS).
U029D: Loss of communication with NOx sensor A.
U029E: Loss of communication with NOx sensor B.
U0401: Invalid data received from the PCM (usually due to communication interference or program version mismatch).
U0452: Invalid data received from the Restraint Control Module.
U3003: Module input voltage low.
10. Chassis, Braking, and Steering Systems (Cxxxx) This involves ABS, electronic parking brake, traction control, and power steering.
C0020: ABS pump motor control circuit fault.
C0031 / C0034: Left front/right front wheel speed sensor circuit fault.
C0040: Brake pedal position sensor circuit fault (directly affects cruise control and brake lights).
C1107: ABS function disabled (usually accompanied by missing U0121 module).
C1223: Deceleration sensor circuit fault.
C2100: Electronic parking brake (EPB) system circuit fault.
C0051: Steering angle sensor (SAS) target setting error (may require recalibration after four-wheel alignment).
11. Body & Safety Controls (Bxxxx) This involves airbags, door modules, lighting, and anti-theft systems.
B10A2: Collision input sensor malfunction (involves post-accident safety cutoff).
B1182: Tire Pressure Monitoring System (TPMS) malfunction.
B1218: Passenger seatbelt pretensioner control circuit malfunction.
B1353: Ignition key circuit malfunction (may cause starting failure).
B1D01: Right low beam headlight circuit malfunction.
B1596: Service interval timer error (usually disappears after manually resetting the service light).
B1048: Passenger side rear window lift control.
12. Cooling, Air Conditioning, and PTO Assistance (Auxiliary Systems) For heavy-duty work vehicles like the 6.7L, the PTO and cooling systems are critical.
P0128: Coolant Temp Below Regulating Temp – Common, the thermostat is stuck in the open position.
P0480: Fan 1 control circuit malfunction (involves cooling performance under heavy loads). P0528: Fan Speed Sensor No Signal.
P0532: Air Conditioning Pressure Sensor Circuit Low Level.
P0691: Fan 1 Control Circuit Low Level.
P253D: Auxiliary Power Output (PTO) Enable Circuit High Level (for vehicles equipped with tippers, booms, etc.).
P2610: PCM Internal Engine Shutdown Timer Malfunction (May Affect Regeneration Logic).
13. Special Combinations and Mixed Codes (P0Axx / P0Cxx)
P0A09: DC/DC Converter Status Circuit Low.
P0C29: Electric Drive Pump Control Module Performance Issues.
