Diagnostic Trouble Code
P229C
Fuel Pressure Regulator 2 Exceeded Learning Limits - Too Low
Technical Description P229C
Fuel Pressure Regulator 2 Exceeded Learning Limits - Too Low
Severity Level P229C
Since insufficient/excessive fuel pressure may cause internal engine and catalytic converter damage and lead to various drivability issues, a code P229C should be categorized as severe.
Symptoms P229C
1
No start condition
2
Engine misfire codes and idle control codes may also accompany a P229C
3
Diminished fuel efficiency
4
Delayed startup when the engine is cool
5
Black smoke from the exhaust system
Possible Causes P229C
1
Engine not timed correctly
2
Low engine oil pressure
3
Faulty fuel pressure sensor
4
Defective fuel pressure regulator
5
Shorted or open wiring and/or connectors in the fuel pressure regulator control circuit
6
Bad PCM or a PCM programming error
Solutions & Repair Steps P229C
You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of reliable vehicle information in order to accurately diagnose a code P229C.
You may save yourself time by searching for technical service bulletins (TSB) that replicate the code stored, vehicle (year, make, model, and engine), and symptoms exhibited. This information may be found in your vehicle information source. If you find the right TSB, it could yield a speedy solution to your diagnosis.
After you connect the scanner to the vehicle diagnostic port and retrieve all stored codes and pertinent freeze frame data, write the information down (in case the code proves to be an intermittent one). After that, clear the codes and test drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.
The code may be more difficult to diagnose if the PCM enters readiness mode at this point, because the code is intermittent. The condition which caused the P229C to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, continue with the diagnosis.
You may obtain connector face views, connector pinout charts, component locator charts, wiring diagrams, and diagnostic flow charts (pertaining to the code and vehicle in question) using your source of vehicle information.
Perform a visual inspection of related wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.
Use the DVOM to test voltage and ground circuits at the electronic fuel regulator (2) and fuel pressure sensor/s. If no voltage is detected, check system fuses. Replace blown or otherwise defective fuses as required and retest.
If voltage is detected, test the corresponding circuit at the PCM connector. If no voltage is detected there, suspect an open circuit between the sensor in question and the PCM. If voltage is discovered there, suspect a defective PCM or PCM programming error.
Test the fuel pressure regulator and the fuel pressure sensor with the DVOM. If either of them do not comply with manufacturer's specifications, consider it defective.
If the fuel regulator (2) and sensor/s appear to be functioning properly, use a manual fuel pressure gauge to test actual fuel pressure at the rail in an effort to duplicate the failure condition.
You may save yourself time by searching for technical service bulletins (TSB) that replicate the code stored, vehicle (year, make, model, and engine), and symptoms exhibited. This information may be found in your vehicle information source. If you find the right TSB, it could yield a speedy solution to your diagnosis.
After you connect the scanner to the vehicle diagnostic port and retrieve all stored codes and pertinent freeze frame data, write the information down (in case the code proves to be an intermittent one). After that, clear the codes and test drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.
The code may be more difficult to diagnose if the PCM enters readiness mode at this point, because the code is intermittent. The condition which caused the P229C to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, continue with the diagnosis.
You may obtain connector face views, connector pinout charts, component locator charts, wiring diagrams, and diagnostic flow charts (pertaining to the code and vehicle in question) using your source of vehicle information.
Perform a visual inspection of related wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.
Use the DVOM to test voltage and ground circuits at the electronic fuel regulator (2) and fuel pressure sensor/s. If no voltage is detected, check system fuses. Replace blown or otherwise defective fuses as required and retest.
If voltage is detected, test the corresponding circuit at the PCM connector. If no voltage is detected there, suspect an open circuit between the sensor in question and the PCM. If voltage is discovered there, suspect a defective PCM or PCM programming error.
Test the fuel pressure regulator and the fuel pressure sensor with the DVOM. If either of them do not comply with manufacturer's specifications, consider it defective.
If the fuel regulator (2) and sensor/s appear to be functioning properly, use a manual fuel pressure gauge to test actual fuel pressure at the rail in an effort to duplicate the failure condition.