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.
Diagnostic Trouble Code Definitions: Notes
When Diagnostic Trouble Code (DTC) is obtained, refer to appropriate DTC test procedure in appropriate SELF-DIAGNOSTICS article.
| Generic Scan Tool DTC (1) | Description | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| - | ECM/PCM Malfunction | ||||||||||||
| P0100 | VAF Circuit Malfunction | ||||||||||||
| P0105 | BARO Circuit Malfunction | ||||||||||||
| P0105 (2) | MAP Circuit Malfunction | ||||||||||||
| P0110 | IAT Circuit Malfunction | ||||||||||||
| P0115 | ECT Circuit Malfunction | ||||||||||||
| P0120 | TPS Circuit Malfunction | ||||||||||||
| P0125 (3)(4)(5)(6) | Excessive Time To Enter Closed Loop Fuel Control | ||||||||||||
| P0128 | Coolant Thermostat Malfunction | ||||||||||||
| P0130 | O2 Sensor Circuit Malfunction (Bank 1 Sensor 1) | ||||||||||||
| P0135 | O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) | ||||||||||||
| P0136 | O2 Sensor Circuit Malfunction (Bank 1 Sensor 2) | ||||||||||||
| P0141 | O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) | ||||||||||||
| P0150 | O2 Sensor Circuit Malfunction (Bank 2 Sensor 1) | ||||||||||||
| P0155 | O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1) | ||||||||||||
| P0156 | O2 Sensor Circuit Malfunction (Bank 2 Sensor 2) | ||||||||||||
| P0161 | O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2) | ||||||||||||
| P0170 | Fuel Trim Malfunction (Bank 1) | ||||||||||||
| P0173 | Fuel Trim Malfunction (Bank 2) | ||||||||||||
| P0180 | Fuel Temperature Sensor Circuit Malfunction | ||||||||||||
| P0201 | Injector No. 1 Circuit Malfunction | ||||||||||||
| P0202 | Injector No. 2 Circuit Malfunction | ||||||||||||
| P0203 | Injector No. 3 Circuit Malfunction | ||||||||||||
| P0204 | Injector No. 4 Circuit Malfunction | ||||||||||||
| P0205 | Injector No. 5 Circuit Malfunction | ||||||||||||
| P0206 | Injector No. 6 Circuit Malfunction | ||||||||||||
| P0300 (3)(6) | Random Misfire Detected | ||||||||||||
| P0301 (3)(6) | Cylinder No. 1 Misfire Detected | ||||||||||||
| P0302 (3)(6) | Cylinder No. 2 Misfire Detected | ||||||||||||
| P0303 (3)(6) | Cylinder No. 3 Misfire Detected | ||||||||||||
| P0304 (3)(6) | Cylinder No. 4 Misfire Detected | ||||||||||||
| P0305 (3) | Cylinder No. 5 Misfire Detected | ||||||||||||
| P0306 (3) | Cylinder No. 6 Misfire Detected | ||||||||||||
| P0335 | CKP Sensor Circuit Malfunction | ||||||||||||
| P0340 | CMP Sensor Circuit Malfunction | ||||||||||||
| P0400 | EGR Flow Malfunction | ||||||||||||
| P0403 | EGR Solenoid Malfunction | ||||||||||||
| P0420 | Catalyst Efficiency Below Threshold | ||||||||||||
| P0421 | Warm Up Catalyst Efficiency Below Threshold | ||||||||||||
| P0431 | Warm Up Catalyst Efficiency Below Threshold | ||||||||||||
| P0442 | EVAP System Leak Detected | ||||||||||||
| P0443 | EVAP Purge Solenoid Circuit Malfunction | ||||||||||||
| P0446 | EVAP System Vent Control Malfunction | ||||||||||||
| P0450 | EVAP System Pressure Sensor Malfunction Or Blocked System | ||||||||||||
| P0455 | EVAP System Leak Or Blockage Detected | ||||||||||||
| P0460 | Fuel Level Sensor Circuit Malfunction | ||||||||||||
| P0500 | Vehicle Speed Sensor Malfunction | ||||||||||||
| P0505 | Idle Control System Malfunction | ||||||||||||
| P0510 | Closed Throttle Position Switch Malfunction | ||||||||||||
| P0551 | Power Steering Pressure Sensor Circuit Range/Performance | ||||||||||||
| P0705 | Transmission Range Sensor Circuit Malfunction (PRNDL Input) | ||||||||||||
| P0710 | Transmission Fluid Temperature Sensor Circuit Malfunction | ||||||||||||
| P0715 (5) | Input/Turbine Speed Sensor Malfunction | ||||||||||||
| P0720 (5) | Output Speed Sensor Circuit Malfunction | ||||||||||||
| P0725 (5) | Engine Speed Input Circuit Malfunction | ||||||||||||
| P0740 (5) | Torque Converter Clutch System Malfunction | ||||||||||||
| P0750 (5) | Shift Solenoid "A" Malfunction | ||||||||||||
| P0755 (5) | Shift Solenoid "B" Malfunction | ||||||||||||
| P0760 (5) | Shift Solenoid "C" Malfunction | ||||||||||||
| P0765 (5) | Shift Solenoid "D" Malfunction | ||||||||||||
| P1400 | Manifold Differential Pressure Sensor Circuit Malfunction | ||||||||||||
| P1500 | Generator FR Terminal Circuit Malfunction | ||||||||||||
| P1600 | Serial Communication Link Malfunction | ||||||||||||
| P1610 | Immobilizer System Malfunction | ||||||||||||
| P1715 | Pulse Generator Assembly Malfunction | ||||||||||||
| P1720 | VSS Signal Line Malfunction | ||||||||||||
| P1750 | Solenoid Assembly Malfunction | ||||||||||||
| P1751 (5) | A/T Control Relay Malfunction | ||||||||||||
| P1791 | ECT Level Input Circuit To TCM Malfunction | ||||||||||||
| P1795 | Throttle Position Input Circuit Malfunction | ||||||||||||
|
|||||||||||||
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.
