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.
2003 Acura MDX BaseFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| P0097 | Intake Air Temperature Sensor 2 Circuit Low Voltage | ||||||||
| P0098 | Intake Air Temperature Sensor 2 Circuit High Voltage | ||||||||
| P0107 | Manifold Absolute Pressure Sensor Circuit Low Voltage | ||||||||
| P0108 | Manifold Absolute Pressure Sensor Circuit High Voltage | ||||||||
| P0112 | Intake Air Temperature Sensor 1 Circuit Low Voltage | ||||||||
| P0113 | Intake Air Temperature Sensor 1 Circuit High Voltage | ||||||||
| P0116 | Engine Coolant Temperature Sensor Range/Performance Problem | ||||||||
| P0117 | Engine Coolant Temperature Sensor Circuit Low Voltage | ||||||||
| P0118 | Engine Coolant Temperature Sensor Circuit High Voltage | ||||||||
| P0122 | Throttle Position Sensor 1 Circuit Low Voltage | ||||||||
| P0123 | Throttle Position Sensor 1 Circuit High Voltage | ||||||||
| P0125 | Engine Coolant Temperature Sensor Slow Response | ||||||||
| P0128 | Cooling System Malfunction | ||||||||
| P0133 | Rear Air Fuel Ratio Sensor Circuit Slow Response (Bank 1, Sensor 1) | ||||||||
| P0134 | Rear Air Fuel Ratio Sensor Heater System Malfunction (Bank 1, Sensor 1) | ||||||||
| P0135 | Rear Air Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1, Sensor 1) | ||||||||
| P0137 | Rear Secondary Heated Oxygen Sensor Circuit Low Voltage (Bank 1, Sensor 2) | ||||||||
| P0138 | Rear Secondary Heated Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2) | ||||||||
| P0139 | Rear Secondary Heated Oxygen Sensor High Response (Bank 1, Sensor 2) | ||||||||
| P0141 | Rear Secondary Heated Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) | ||||||||
| P0153 | Front Air Fuel Ratio Sensor Circuit Slow Response (Bank 2, Sensor 1) | ||||||||
| P0154 | Front Air Fuel Ratio Sensor Heater System Malfunction (Bank 2, Sensor 1) | ||||||||
| P0155 | Front Air Fuel Ratio Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) | ||||||||
| P0157 | Front Secondary Heated Oxygen Sensor Circuit Low Voltage (Bank 2, Sensor 2) | ||||||||
| P0158 | Front Secondary Heated Oxygen Sensor Circuit High Voltage (Bank 2, Sensor 2) | ||||||||
| P0159 | Front Secondary Heated Oxygen Sensor Circuit Slow Response (Bank 2, Sensor 2) | ||||||||
| P0161 | Front Secondary Heated Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 2) | ||||||||
| P0171 | Rear Bank Fuel System Too Lean (Bank 1) | ||||||||
| P0172 | Rear Bank Fuel System Too Rich (Bank 1) | ||||||||
| P0174 | Front Bank Fuel System Too Lean (Bank 2) | ||||||||
| P0175 | Front Bank Fuel System Too Rich (Bank 2) | ||||||||
| P0201 | No. 1 Injector Circuit Malfunction | ||||||||
| P0202 | No. 2 Injector Circuit Malfunction | ||||||||
| P0203 | No. 3 Injector Circuit Malfunction | ||||||||
| P0204 | No. 4 Injector Circuit Malfunction | ||||||||
| P0205 | No. 5 Injector Circuit Malfunction | ||||||||
| P0206 | No. 6 Injector Circuit Malfunction | ||||||||
| P0222 | Throttle Position Sensor 2 Circuit Low Voltage | ||||||||
| P0223 | Throttle Position Sensor 2 Circuit High Voltage | ||||||||
| P0300 | Random Misfire | ||||||||
| P0301 | Cylinder No. 1 Misfire Detected | ||||||||
| P0302 | Cylinder No. 2 Misfire Detected | ||||||||
| P0303 | Cylinder No. 3 Misfire Detected | ||||||||
| P0304 | Cylinder No. 4 Misfire Detected | ||||||||
| P0305 | Cylinder No. 5 Misfire Detected | ||||||||
| P0306 | Cylinder No. 6 Misfire Detected | ||||||||
| P0325 | Knock Sensor Circuit Malfunction | ||||||||
| P0335 | Crankshaft Position Sensor "A" No Signal | ||||||||
| P0339 | Crankshaft Position Sensor "A" Intermittent Interruption | ||||||||
| P0340 | Camshaft Position Sensor No Signal | ||||||||
| P0344 | Camshaft Position Sensor Intermittent Interruption | ||||||||
| P0385 | Crankshaft Position Sensor "B" No Signal | ||||||||
| P0389 | Crankshaft Position Sensor "B" Intermittent Interruption | ||||||||
| P0401 | Exhaust Gas Recirculation Insufficient Flow | ||||||||
| P0403 | Exhaust Gas Recirculation Control Circuit Malfunction | ||||||||
| P0404 | Exhaust Gas Recirculation Control Circuit Range/Performance Problem | ||||||||
| P0406 | Exhaust Gas Recirculation Valve Position Sensor Circuit High Voltage | ||||||||
| P0420 | Rear Bank Catalyst System Efficiency Below Threshold (Bank 1) | ||||||||
| P0430 | Front Bank Catalyst System Efficiency Below Threshold (Bank 2) | ||||||||
| P0443 | Evaporative Emission Canister Purge Valve Circuit Malfunction | ||||||||
| P0451 | Fuel Tank Pressure Sensor Circuit Range/Performance Problem | ||||||||
| P0452 | Fuel Tank Pressure Sensor Circuit Low Voltage | ||||||||
| P0453 | Fuel Tank Pressure Sensor Circuit High Voltage | ||||||||
| P0455 | Evaporative Emission Control System Very Large Leak Detected | ||||||||
| P0456 | Evaporative Emission Control System Very Small Leak Detected | ||||||||
| P0457 | Evaporative Emission Control System Leak Detected Fuel Fill Cap Loose/Off | ||||||||
| P0461 | Fuel Level Sensor Range/Performance Problem | ||||||||
| P0462 | Fuel Level Sensor Circuit Low Voltage | ||||||||
| P0463 | Fuel Level Sensor Circuit High Voltage | ||||||||
| P0496 | Evaporative Emission Control System | ||||||||
| P0497 | Evaporative Emission Control System | ||||||||
| P0498 | Evaporative Emission Canister Vent Shut Valve Control Circuit Low Voltage | ||||||||
| P0499 | Evaporative Emission Canister Vent Shut Valve Control Circuit High Voltage | ||||||||
| P0506 | Idle Control System RPM Lower Than Expected | ||||||||
| P0507 | Idle Control System RPM Higher Than Expected | ||||||||
| P0563 | PCM Power Source Circuit Unexpected Voltage | ||||||||
| P0603 | PCM Internal Control Module Keep Alive Memory Error | ||||||||
| P0606 | PCM Processor Malfunction | ||||||||
| P0627 | PGM-FI Main Relay 2 Circuit Malfunction (Fuel Pump) | ||||||||
| P0641 | Sensor Reference Voltage A Circuit Malfunction | ||||||||
| P0651 | Sensor Reference Voltage B Circuit Malfunction | ||||||||
| P0657 | Air Fuel Ratio Sensor Relay Circuit Malfunction | ||||||||
| P0685 | PCM Power Control Circuit Malfunction | ||||||||
| P0700 (4) | (1) Automatic Transaxle | ||||||||
| P0700 | (1) Automatic Transaxle | ||||||||
| P1077 | Intake Manifold Runner Control Valve Stuck Short | ||||||||
| P1078 | Intake Manifold Runner Control Valve Stuck Long | ||||||||
| P1128 | Manifold Absolute Pressure Sensor Signal Lower Than Expected | ||||||||
| P1129 | Manifold Absolute Pressure Sensor Signal Higher Than Expected | ||||||||
| P1297 | Electrical Load Detector Circuit Low Voltage | ||||||||
| P1298 | Electrical Load Detector Circuit High Voltage | ||||||||
| P1450 | Two Way Bypass Valve Control Circuit Low Voltage | ||||||||
| P1451 | Two Way Bypass Valve Control Circuit High Voltage | ||||||||
| P1454 | Fuel Tank Pressure Sensor Range/Performance Problem | ||||||||
| P1460 | Fuel Level Sensor Power Supply Circuit | ||||||||
| P1683 | Throttle Valve Default Position Spring Performance Problem | ||||||||
| P1684 | Throttle Valve Return Spring Performance Problem | ||||||||
| P2101 | Throttle Actuator System Malfunction | ||||||||
| P2108 | Throttle Actuator Control Module Problem | ||||||||
| P2118 | Throttle Actuator Control Module Range/Performance Problem | ||||||||
| P2122 | Accelerator Pedal Position Sensor 1 Circuit Low Voltage (TPS D) | ||||||||
| P2123 | Accelerator Pedal Position Sensor 1 Circuit High Voltage (TPS D) | ||||||||
| P2127 | Accelerator Pedal Position Sensor 2 Circuit Low Voltage (TPS E) | ||||||||
| P2128 | Accelerator Pedal Position Sensor 2 Circuit High Voltage (TPS E) | ||||||||
| P2135 | Throttle Position Sensor 1 & 2 Incorrect Voltage Correlation | ||||||||
| P2138 | Accelerator Pedal Position Sensor Circuit High Voltage | ||||||||
| P2176 | Throttle Actuator Control System Idle Position Not Learned | ||||||||
| P2195 | Rear Air Fuel Ratio Sensor Signal Stuck Lean (Bank 1, Sensor 1) | ||||||||
| P2197 | Front Air Fuel Ratio Sensor Signal Stuck Lean (Bank 2, Sensor 1) | ||||||||
| P2199 | Intake Air Temperature Sensor 1 & 2 Correlation | ||||||||
| P2227 | Barometric Pressure Sensor Range/Performance Problem | ||||||||
| P2228 | Barometric Pressure Sensor Circuit Low Voltage | ||||||||
| P2229 | Barometric Pressure Sensor Circuit High Voltage | ||||||||
| P2237 | Rear Air Fuel Ratio Sensor IP Line High Voltage (Bank 1, Sensor 1) | ||||||||
| P2238 | Rear Air Fuel Ratio Sensor IP Line Low Voltage (Bank 1, Sensor 1) | ||||||||
| P2240 | Front Air Fuel Ratio Sensor IP Line High Voltage (Bank 2, Sensor 1) | ||||||||
| P2241 | Front Air Fuel Ratio Sensor IP Line Low Voltage (Bank 2, Sensor 1) | ||||||||
| P2243 | Rear Air Fuel Ratio Sensor Label VCENT Line High Voltage (Bank 2, Sensor 1) | ||||||||
| P2245 | Rear Air Fuel Ratio Sensor Label VCENT Line Low Voltage (Bank 1, Sensor 1) | ||||||||
| P2247 | Front Air Fuel Ratio Sensor Label VCENT Line High Voltage (Bank 2, Sensor 1) | ||||||||
| P2249 | Front Air Fuel Ratio Sensor Label VCENT Line Low Voltage (Bank 2, Sensor 1) | ||||||||
| P2251 | Rear Air Fuel Ratio Sensor Label VS Line High Voltage (Bank 2, Sensor 1) | ||||||||
| P2252 | Rear Air Fuel Ratio Sensor Label VS Line Low Voltage (Bank 1, Sensor 1) | ||||||||
| P2254 | Front Air Fuel Ratio Sensor Label VS Line High Voltage (Bank 2, Sensor 1) | ||||||||
| P2255 | Front Air Fuel Ratio Sensor Label VS Line Low Voltage (Bank 2, Sensor 1) | ||||||||
| P2279 | Intake Air System Leak | ||||||||
| P2413 | EGR System Malfunction | ||||||||
| P2422 | EVAP Canister Vent Shut Valve Close Malfunction | ||||||||
| P2552 | Throttle Actuator Control Module Relay Malfunction | ||||||||
| P2610 | 24-Hour Timer Malfunction | ||||||||
| P2627 | Rear Air Fuel Ratio Sensor Label Circuit Low Voltage (Bank 1, Sensor 1) | ||||||||
| P2628 | Rear Air Fuel Ratio Sensor Label Circuit High Voltage (Bank 1, Sensor 1) | ||||||||
| P2630 | Front Air Fuel Ratio Sensor Label Circuit Low Voltage (Bank 2, Sensor 1) | ||||||||
| P2631 | Front Air Fuel Ratio Sensor Label Circuit High Voltage (Bank 2, Sensor 1) | ||||||||
| P2646 | VTEC Oil Pressure Circuit Low Voltage | ||||||||
| P2647 | VTEC Oil Pressure Circuit High Voltage | ||||||||
| P2648 | VTEC Solenoid Valve Circuit Low Voltage | ||||||||
| P2649 | VTEC Solenoid Valve Circuit High Voltage | ||||||||
| P2A00 | Rear Air Fuel Ratio Sensor Range/Performance Problem (Bank 1, Sensor 1) | ||||||||
| P2A03 | Front Air Fuel Ratio Sensor Label Circuit Range/Performance Problem (Bank 2, Sensor 1) | ||||||||
| U0073 (2) | F CAN Malfunction (Bus-OFF) | ||||||||
| U0107 | Lost Communication With Throttle Actuator Control Module | ||||||||
| U0114 (2) | F CAN Malfunction (VTM-4 Control Unit -PCM) | ||||||||
| U0112 (3) | F CAN Malfunction (VSA-PCM) | ||||||||
|
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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.
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