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2004 Chrysler Pacifica: P0700, P0440, and P0522 OBD2 Fault Codes - Diagnosis & Fixes

Model: Pacifica Fault Code: P0440 Posted: 2014-09-14 20:56

After replacing the thermostat on my 2004 Chrysler Pacifica, I noticed the check engine light came on with fault codes P0700, P0440, and P0522. The vehicle was restarted after the repair, but the issue persists. I used a key-on-off cycle to reset the system, and initially cleared the P0700 code. However, my son reported that during his commute home, the check engine light reappeared with new codes: P0440 (Evaporative Emission System Malfunction) and P0522 (Engine RPM Sensor Issue). He also noted a burnt oil smell and found oil residue in the antifreeze reservoir. I suspect a potential internal leak or sensor fault, but further diagnostics are needed.

Related fault codes
P0440P0522P0700
Comments (3)
Anonymous 2014-09-15 10:42

The P0700 code is a generic transmission diagnostic trouble code indicating that there are additional transmission-related issues present. Did you use an OBD2 scanner or perform a key-on-off reset? Was the battery disconnected prior to any work? Were the ignition and key left on during repairs? Please review your workspace — ensure no wires were unplugged or moved. Additionally, check all fuses, especially those under the hood. A proper scan tool is essential for accurate diagnosis.

Anonymous 2014-09-16 18:32

I performed a key-on-off reset and disconnected the battery before working on the vehicle. After that, the P0700 code cleared. However, my son reported that upon returning home from work (about 18 miles away), the check engine light reappeared with codes P0440 and P0522. He noticed a strong smell of burnt oil and found oil residue in the antifreeze reservoir. This suggests possible internal engine or transmission fluid leakage, which may be linked to the P0522 code (RPM sensor issue) or the evaporative system failure indicated by P0440.

Anonymous 2014-09-16 21:33

For reference, here is a detailed explanation of these OBD2 codes: https://www.obd-codes.com/trouble_codes/p0700-p0440-p0522