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.
1996 Geo Tracker Base, 4D Utility, RWDFACTORY OEM SERVICE PROCEDURE
DTC Definition
DTC IDENTIFICATION
| DTC | System Affected | Condition | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| P0101 | Mass Airflow (MAF) Circuit Performance Problem | Poor MAF Sensor Performance | ||||||||
| P0102 | Mass Airflow (MAF) Circuit Low Input | MAF Sensor Low Input | ||||||||
| P0103 | Mass Airflow (MAF) Circuit High Input | MAF Sensor High Input | ||||||||
| P0112 | Intake Air Temperature (IAT) Sensor Circuit Low Input | Low IAT Sensor Circuit Input | ||||||||
| P0113 | IAT Sensor Circuit High Input | High IAT Sensor Circuit Input | ||||||||
| P0117 | ECT Sensor Circuit Low Input | Low ECT Sensor Circuit Input | ||||||||
| P0118 | ECT Sensor Circuit High Input | High ECT Sensor Circuit Input | ||||||||
| P0121 | Throttle Position (TP) Sensor System Performance | Poor TP Sensor Performance | ||||||||
| P0122 | Throttle Position (TP) Sensor Circuit Low Input | Low TP Sensor Circuit Input | ||||||||
| P0123 | Throttle Position (TP) Sensor Circuit High Input | High TP Sensor Circuit Input | ||||||||
| P0125 | Excessive Time To Enter Closed Loop | Insufficient Coolant Temperature For Closed Loop Operation | ||||||||
| P0131 | HO2S No. 1 Circuit Voltage Low | Low HO2S No.1 Circuit Input | ||||||||
| P0132 | HO2S No. 1 Circuit Voltage High | High HO2S No.1 Circuit Input | ||||||||
| P0133 | Heated Oxygen Sensor (HO2S) No. 1 Slow Response | Slow Response Of HO2S No.1 Circuit | ||||||||
| P0134 | HO2S No. 1 Circuit Activity Insufficient | No HO2S No. 1 Circuit Activity Detected | ||||||||
| P0135 | HO2S No. 1 Heater Circuit Malfunction | HO2S No. 1 Heater Circuit Malfunction | ||||||||
| P0136 | HO2S No. 2 Circuit Malfunction | HO2S No. 2 Circuit Malfunction | ||||||||
| P0141 | HO2S No. 2 Heater Circuit Malfunction | HO2S No. 2 Heater Circuit Malfunction | ||||||||
| P0171 | Fuel Trim System Lean | Total Fuel Trim Is Greater Than Allowed Specification | ||||||||
| P0172 | Fuel Trim System Rich | Total Fuel Trim Is Less Than Allowed Specification | ||||||||
| P0300 | Misfire Detected | Electrical Or Mechanical Misfire (Catalyst Damaging) | ||||||||
| P0301 | Cylinder No. 1 Misfire | Electrical Or Mechanical Misfire Common To One Cylinder | ||||||||
| P0302 | Cylinder No. 2 Misfire | Electrical Or Mechanical Misfire Common To One Cylinder | ||||||||
| P0303 | Cylinder No. 3 Misfire | Electrical Or Mechanical Misfire Common To One Cylinder | ||||||||
| P0304 | Cylinder No. 4 Misfire | Electrical Or Mechanical Misfire Common To One Cylinder | ||||||||
| P0335 | CKP Sensor Circuit Malfunction | No CKP Sensor Signal (Engine Running) | ||||||||
| P0340 | CMP Sensor Circuit Malfunction | No CMP Sensor Signal For 2 Seconds During Engine Cranking | ||||||||
| P0400 | Exhaust Gas Recirculation (EGR) Flow Malfunction | Excessive Or Insufficient EGR Flow | ||||||||
| P0420 | Three-Way Catalyst (TWC) System Efficiency Low | HO2S No. 1 & 2 Output Is Similar | ||||||||
| P0440 (1) | Evaporative (EVAP) Control System Malfunction | EVAP System Leak Detected | ||||||||
| P0443 (2) | EVAP Control System Purge Flow Incorrect | Canister Purge Control System Malfunction | ||||||||
| P0450 (1) | EVAP Control System Pressure Sensor Malfunction | Pressure Sensor Circuit Open Or Shorted To Ground | ||||||||
| P0461 | Fuel Level Sensor Circuit Performance | Poor Fuel Level Sensor Circuit Performance | ||||||||
| P0463 | Fuel Level Sensor Circuit Voltage High | High Voltage Input | ||||||||
| P0500 | Vehicle Speed Sensor (VSS) Malfunction | No Signal In "D" Range | ||||||||
| P0505 | Idle Air Control (IAC) System Malfunction | Target Idle Speed Not Obtained | ||||||||
| P0510 | Closed Throttle Position (CTP) Switch Malfunction | No CTP Switch Activity | ||||||||
| P0601 | PCM Memory Error | Data Write Error | ||||||||
| P0603 | Keep Alive Memory Error | EEPROM Memory Error | ||||||||
| P1408 | MAP Sensor Circuit Malfunction | MDP Sensor circuit Open or Shorted To Ground | ||||||||
| P1410 (1) | Fuel Tank Pressure Control System Malfunction | Low Voltage Signal With High Fuel Level Reading | ||||||||
| P1450 | Barometric Pressure Sensor Circuit Malfunction | Low Or High Input | ||||||||
| P1451 | Barometric Pressure Sensor Performance Problem | Barometric Pressure Sensor Performance Problem During Cranking | ||||||||
| P1500 | Engine Starter Signal Circuit Malfunction | No Input Or Constant InputFrom Starter Signal Circuit | ||||||||
| P1510 | ECM Backup Power Supply Malfunction | No Back-Up Power Supply After Engine Start | ||||||||
| P1530 | Ignition Timing Adjustment Switch CKT Malfunction | Test Switch Terminal Shorted To Ground | ||||||||
| P1600 (3) | PCM & TCM Serial Communication Fault | No Signal Or Check Sum Error While Engine Running | ||||||||
| P1715 (4) | PNP Switch CKT Malfunction | Engine Start Or High Speed Is Detected In Other Than "P" Or "N" Range | ||||||||
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Factory Service Tools
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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.