Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Freeze Frame Data: Description
Freeze frame data allows access to emission related values from specific generic parameter identification (PIDs). These values are stored the instant an emission related DTC is stored in continuous memory. This provides a snapshot of the conditions that were present when the DTC was stored. Once one set of freeze frame data is stored, this data remains in memory even if another emission related DTC is stored. When a DTC associated with the freeze frame is erased, the freeze frame data is also erased, and new freeze frame data can be stored. In the event of multiple emission related DTCs in memory, always note the DTC for the freeze frame data.
| Acronym | Description | Measurement Units |
|---|---|---|
| AAT | Ambient Air Temperature | Temperature °C/°F |
| APP_D | Accelerator Pedal Position D | Percent |
| APP_E | Accelerator Pedal Position E | Percent |
| BARO | Barometric Pressure | Pressure/kPa/psi |
| CAC_T | Charge Air Cooler Temperature Bank 1, Sensor 1 Temperature | °C/°F |
| DPF_LOAD_PCT | DPF Percentage Load Inferred | Percent |
| DPF_REGN_AVGD | Average Distance Between DPF Regenerations | km/miles |
| DPF_REGN_STAT | Diesel Particulate Filter Regeneration Status | Active/Inactive |
| DPF_SOOT_INF | Diesel Particulate Filter Soot Concentration Inferred | Grams/Liter |
| EBP | Exhaust Pressure Sensor 1 | Pressure/kPa/psi |
| ECT1 | Engine Coolant Temperature Sensor 1 | Temperature °C/°F |
| ECT2 | Engine Coolant Temperature Sensor 2 | Temperature °C/°F |
| EGR_A_ACT | Actual Exhaust Gas Recirculation A Duty Cycle Or Position | Percent |
| EGR_A_CMD | Commanded Exhaust Gas Recirculation A Duty Cycle Or Position | Percent |
| EGRTP_V | Exhaust Gas Recirculation Throttle Position | Voltage |
| EGRTC | Exhaust Gas Recirculation Temperature Bank 1, Sensor 1 | Temperature °C/°F |
| EGRT12 | Exhaust Gas Recirculation Temperature Bank 1, Sensor 2 | Temperature °C/°F |
| EGRTP_CMD | Exhaust Gas Recirculation Throttle Position Commanded | Percent |
| EGT11 | Exhaust Gas Temperature 11 | Temperature °C/°F |
| EGT12 | Exhaust Gas Temperature 12 | Temperature °C/°F |
| EGT13 | Exhaust Gas Temperature 13 | Temperature °C/°F |
| EGT14 | Exhaust Gas Temperature 14 | Temperature °C/°F |
| ENGIDL_TIME_TOT | Total Idle Run Time | Time |
| ENG_TIME_TOT | Total Engine Run Time | Time |
| EOT | Engine Oil Temperature | Temperature °C/°F |
| FLI | Fuel Level Input | Percent |
| FRP_A | Fuel Rail Pressure A | Pressure/kPa/MPa/psi |
| FRP_A_CMD | Commanded Fuel Rail Pressure A | Pressure/kPa/MPa/psi |
| FRT_A | Fuel Rail Temperature A | Temperature °C/°F |
| FUELRATE | Engine Fuel Rate | ml/min/lmin |
| FUEL_TIMING | Main Injection Timing Relative To TDC | Angle |
| GP_LMP | Glow Plug Lamp | ON/OFF |
| IAT11 | Intake Air Temperature Bank 1, Sensor 1 | Temperature °C/°F |
| LOAD | Engine Load | Percent |
| MAF_A | Mass Air Flow Sensor A | g/s |
| MAP_A | Intake Manifold Absolute Pressure A | Pressure/kPa/psi |
| NOxLMP_TIME | Total Engine Run Time With Nitrogen Oxide Warning Active | Time |
| PTO | Power Take Off Status | ON/OFF |
| PTOTIME_TOT | Total Run Time With Power Take Off Active | Time |
| REDUCT_AVG_DMD | Average Reductant Consumption Demanded | ml/min |
| REDUCT_RATE | Average Reductant Consumption | ml/min |
| REDUCT_TNK_LV | Reductant Tank Level | Percent |
| RPM | Engine Revolutions Per Minute | RPM |
| RUNTM | Engine Run Time | Time |
| TQ_PCT_ACT | Calculated Torque Output Of The Engine | Percent |
| TQ_PCT_DD | Requested Torque Output Of The Engine By Driver | Percent |
| TQ_ENGREF | Engine Reference Torque | Nm |
| VPWR | Module Supply Voltage | Voltage |
| VSS | Vehicle Speed | km/h/mph |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.