504 Generic diagnostic codes on file. Each shows the symptom for free — unlock the full diagnosis, repair steps, and field insights with a free account.
| Code | System | Symptom | Fix |
|---|---|---|---|
| P0140 | Emissions | MIL On / Catalyst Test Incomplete | Unlock |
| P0141 | Emissions | MIL On / Slow System Readiness | Unlock |
| P0142 | Emissions | MIL On | Unlock |
| P0143 | Emissions | MIL On | Unlock |
| P0144 | Emissions | MIL On | Unlock |
| P0145 | Emissions | MIL On | Unlock |
| P0146 | Emissions | MIL On | Unlock |
| P0147 | Emissions | MIL On | Unlock |
| P0150 | Emissions | Engine Runs Rough / High Emissions | Unlock |
| P0151 | Emissions | Engine Hesitation / Surging | Unlock |
| P0152 | Emissions | Black Smoke / Misfires | Unlock |
| P0153 | Emissions | Slow Fuel Trim Shifts | Unlock |
| P0154 | Emissions | Open Loop on Bank 2 Only | Unlock |
| P0155 | Emissions | Slow Engine Closed-Loop Step | Unlock |
| P0156 | Emissions | MIL On | Unlock |
| P0157 | Emissions | MIL On | Unlock |
| P0158 | Emissions | MIL On | Unlock |
| P0159 | Emissions | MIL On | Unlock |
| P0160 | Emissions | MIL On | Unlock |
| P0161 | Emissions | MIL On | Unlock |
| P0162 | Emissions | MIL On | Unlock |
| P0163 | Emissions | MIL On | Unlock |
| P0164 | Emissions | MIL On | Unlock |
| P0165 | Emissions | MIL On | Unlock |
| P0166 | Emissions | MIL On | Unlock |
| P0167 | Emissions | MIL On | Unlock |
| P0170 | Fuel System | Engine Hunting / Poor Power | Unlock |
| P0171 | Air Intake | Poor Acceleration / Lean | Unlock |
| P0171 | Fuel System | Rough Idle / Lean Stumble | Unlock |
| P0171 | Fuel System | Rough Idle / Lean Stumble | Unlock |
| P0172 | Fuel System | Black Smoke / Fuel Smells | Unlock |
| P0173 | Fuel System | Engine Surges on Deceleration | Unlock |
| P0174 | Fuel System | Lean Shudder under Load | Unlock |
| P0175 | Fuel System | Misfires / Spark Plug Sooting | Unlock |
| P0176 | Fuel System | Stumble on Flex-Fuel Startups | Unlock |
| P0177 | Fuel System | Poor Acceleration with E85 Fuel | Unlock |
| P0178 | Fuel System | MIL On / Default Trim Maps | Unlock |
| P0179 | Fuel System | MIL On / Rough Running | Unlock |
| P0180 | Fuel System | MIL On Only | Unlock |
| P0181 | Fuel System | MIL On / Hard Hot Starts | Unlock |
| P0182 | Fuel System | MIL On | Unlock |
| P0183 | Fuel System | MIL On | Unlock |
| P0184 | Fuel System | Intermittent Stumble on Grade Changes | Unlock |
| P0185 | Fuel System | MIL On Only | Unlock |
| P0186 | Fuel System | MIL On | Unlock |
| P0187 | Fuel System | MIL On | Unlock |
| P0188 | Fuel System | MIL On | Unlock |
| P0189 | Fuel System | Erratic Instrument Cluster Readout | Unlock |
| P0190 | Fuel System | No Start / Limp Mode Warning | Unlock |
| P0191 | Fuel System | Limp Mode / Hard Start Under Load | Unlock |
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