High Pressure Diagnostic Capabilities
Redline Detection · Diagnostic Technology
High Pressure
Diagnostic Capabilities
Variable high pressure pinpoints leaking components in turbo, diesel, and heavy-duty vehicles in minutes - finding leaks that low-pressure EVAP machines cannot detect.
- Cut Diagnostic Time
- Increase CSI
- Pinpoint Air Leak Issues
- Improve Repair Quality
- Lower Vehicle Buybacks
- Standardize The Repair Process
- Eliminate Repeat Repairs
- Lower Vehicle Buybacks
- Boost Service Revenue
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Fault Code Reference
High pressure fault codes are organized into four diagnostic groupings — each corresponding to the system Redline high pressure equipment is engineered to test. Select a group to expand codes and applications.
Core High Pressure
Boost / Charge Air System
Turbocharger, supercharger, charge air cooler & intercooler faults
7 CODES
Direct turbo/boost/CAC faults — the primary high pressure fault codes most technicians encounter. These are most directly solved by high pressure smoke testing, as they indicate air leaks in the charge air circuit between the turbo compressor outlet and the intake manifold.
| Code | Description |
|---|---|
| P0046 | Turbo/Supercharger Boost Control 'A' Circuit Range/Performance |
| P012B | Turbocharger/Supercharger Inlet Pressure Sensor Circuit |
| P0236 | Turbocharger Boost Sensor A Circuit Range/Performance |
| P0299 | Under Boost Condition |
| P026A | Charge Air Cooler (CAC) Efficiency Below Threshold |
| P007B | Charge Air Cooler Temperature Sensor Circuit (Bank 1) |
| P2263 | Turbocharger/Supercharger Boost System Performance |
Indirect High Pressure
Intake / Engine Air System
Unmetered air, MAF/MAP, lean/rich & misfire faults
19 CODES
These codes point toward air leaks that affect engine performance and fueling but are not always immediately obvious as boost-related. Unmetered air entering the intake system downstream of the MAF sensor — from vacuum leaks, cracked intake manifolds, failed gaskets, or loose connections — disrupts air/fuel ratio and triggers these codes.
| Code | Description |
|---|---|
| P0068 | MAP/MAF — Throttle Position Correlation |
| P00C7 | Intake Air Pressure Measurement System |
| P00E9 | Intake Air Temperature (IAT) Sensor 3 Circuit |
| P0101 | Mass Air Flow (MAF) Circuit Range/Performance |
| P0106 | Manifold Absolute Pressure/Barometric Pressure Sensor Range/Performance |
| P0121 | Throttle/Pedal Position Sensor 'A' Circuit Range/Performance |
| P0133 | Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 1 or 2) |
| P0153 | O2 Sensor Circuit Slow Response (Bank 2, Sensor 1) |
| P015B | PCM Detected Slow Lean-to-Rich O2 Response (Bank 1, Sensor 1) |
| P0171 | System Too Lean (Bank 1) |
| P0174 | System Too Lean (Bank 2) |
| P0507 | Idle Control System RPM Higher Than Expected |
| P10D5 | Intake Air Temperature (IAT) Sensor 2 Circuit Range/Performance |
| P200A | Intake Manifold Runner Performance (Bank 1) |
| P2227 | Barometric Pressure Sensor "A" Circuit Range/Performance |
| P0135 | Oxygen Sensor (HO2S) Performance Bank 1 Sensor 1 |
| P0300–P0308 | Random or Multiple Cylinder Misfire Detected |
| P0050–P0507 | Idle Control System Issues |
| P2096–P2099 | Post Catalyst Fuel Trim System Issues |
Downstream High Pressure
Exhaust / Aftertreatment System
DPF, SCR, EGR, catalyst efficiency & regeneration faults
11 CODES
Leaks, blockages, or failures in the exhaust aftertreatment system — particularly relevant for HD diesel fleets dealing with DPF, SCR, and EGR faults. Redline's HD PowerSmoke® is proven to eliminate up to 96% of forced regenerations when upstream leaks in this system are properly identified and repaired.
| Code | Description |
|---|---|
| P0401 | Exhaust Gas Recirculation (EGR) Flow Insufficient |
| P0402 | Excessive Flow in EGR System |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) |
| P0430 | Catalyst System Efficiency Below Threshold (Bank 2) |
| P2002 | Diesel Particulate Filter (DPF) Efficiency Below Threshold (Bank 1) |
| P20EE | SCR NOx Catalyst Efficiency Below Threshold (Bank 1) |
| P2457 | EGR Cooler Efficiency Below Threshold |
| P2459 | Diesel Particulate Filter Regeneration Frequency |
| P2463 | DPF Restriction — Soot Accumulation |
| P249D | Closed Loop Reductant Injection Control at Limit — Flow Too Low |
| P249E | EGR System Performance Issue |
Crankcase / PCV — Unique to High Pressure
Crankcase Ventilation System
PCV faults — no EVAP equivalent; exclusive to high pressure diagnostics
1 CODE
These codes indicate leaks or failures in the positive crankcase ventilation system that allow unmetered air or oil vapor to enter the intake, causing lean conditions, rough idle, and oil consumption issues.
| Code | Description |
|---|---|
| P04DB | Crankcase Ventilation (CCV) System Disconnected or Malfunctioning |
Diagnostic Application Reference
Every application mapped to its primary fault code grouping
Turbo / Boost Leaks
Group 1 — Boost / Charge Air
Charge Air Cooler Leaks
Group 1 — Boost / Charge Air
Boosted Intake System
Group 1 — Boost / Charge Air
Wind & Water Leaks
Group 2 — Intake / Engine Air
Cabin Leaks
Group 2 — Intake / Engine Air
Seals, Gaskets & Hoses
Group 2 — Intake / Engine Air
Exhaust System Leaks
Group 3 — Exhaust / Aftertreatment
DPF Inspection
Group 3 — Exhaust / Aftertreatment
EGR System Testing
Group 3 — Exhaust / Aftertreatment
PCV System
Group 4 — Crankcase / PCV
Crankcase Pressure Testing
Group 4 — Crankcase / PCV
Oil Vapor Leak Detection
Group 4 — Crankcase / PCV