P3003 Engine Trouble Code
What is P3003?
With P3003, you may drive for several weeks with a malfunctioning MAF sensor, but expect decreased fuel economy and eventual stalling. Shop replacement costs $240–$400 depending on vehicle. The labour is straightforward, with most cost from the part itself.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Code: | P3003 |
P3003 Symptoms
Check Engine Light
Illuminated dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration
Starting Problems
Difficulty starting the engine
P3003 Code Structure
Understanding what each digit means in the P3003 powertrain trouble code:
| P | 3 | 0 | 0 | 3 |
|---|---|---|---|---|
| Powertrain Code | Ignition System Or Misfire | Ambient Air Temperature Sensor Circuit Low | Cold Start Injector 1 Malfunction | Exhaust Gas Recirculation Sensor B Circuit High |
How to Fix P3003
Diagnostic Steps:
Poor running symptoms align with MAP sensor malfunction. In some cases, a faulty MAP sensor will not trigger a code. The issue may represent separate wiring concerns requiring individual diagnosis.
Repair Solution:
Crankshaft position sensor signals the computer for precise ignition and fuel injection timing. Faulty sensors cause rough running and reduced efficiency. Modern vehicles enter limp mode and illuminate the check-engine light.
Technical Notes:
Parts or components should not be replaced based solely on P3003 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
P3003 Description
P3003 engine trouble code is related to Exhaust Gas Recirculation Sensor B Circuit High.
Main Cause
The primary reason for P3003 OBD-II Engine Trouble Code is: Ambient Air Temperature Sensor Circuit Low.