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2005 Dodge Ram 1500 SLT P0057 Code: Oxygen Sensor Bank 2 Low Voltage Issue and PCM Replacement Cost Concerns

Model: Ram Fault Code: P0057 Posted: 2020-10-03 13:03

I own a 2005 Dodge Ram 1500 SLT with a 4.7L engine. Recently, I've been experiencing the P0057 diagnostic trouble code, which indicates a low voltage issue in the oxygen sensor for Bank 2 (passenger side), located after the catalytic converter. The mechanic initially diagnosed and repaired an evaporative emissions leak. After replacing two oxygen sensors—charged at $184.00—he claimed the check engine light would stay off. However, the P0057 code returned immediately. He then suggested a faulty Powertrain Control Module (PCM), so I purchased a new PCM, which temporarily resolved the issue. After driving approximately 25 miles, the check engine light reappeared with the same P0057 code. This is highly concerning because the oxygen sensors were replaced and the wiring appears intact. The original PCM was not malfunctioning—there's no evidence of a hardware failure in either the sensor or the control circuit. My total repair cost now stands at $802.00, including $602 for labor and $200 for programming and flashing the new PCM. I am deeply frustrated because replacing the PCM appears to be an unnecessary expense when the root cause may not have been a faulty module or sensor. I'm seeking clarity on what could be causing this persistent P0057 code, especially since it remains active even after clearing with an OBD-II scanner and despite the truck running perfectly for five weeks prior. I want to understand whether there's a deeper issue—such as wiring faults, sensor heater element failure, or control circuit problems—that might explain why the code persists. I'm considering taking legal action against this mechanic if he fails to resolve the issue properly. Any insights into potential causes of P0057 in a 2005 Dodge Ram 1500 would be greatly appreciated.

Related fault codes
P0057
Comments (4)
Anonymous 2020-10-03 15:42

Common causes of P0057 include: failure of the heater element in Bank 2, Sensor 2 (passenger side post-cat); physical damage to the oxygen sensor; shorted control circuit or voltage feed to the sensor; PCM-related issues such as internal faults in the oxygen sensor driver circuit. For accurate diagnosis, it's essential to verify sensor type and wiring integrity.

Anonymous 2020-10-05 17:16

It's important to confirm whether the replaced oxygen sensors were original equipment manufacturer (OEM) or aftermarket parts. Aftermarket sensors may not meet factory specifications and can lead to false readings or persistent diagnostic codes like P0057.

Anonymous 2020-10-05 17:37

Could you specify which exact oxygen sensor models were installed? The P0057 code refers specifically to Bank 2, Sensor 2 (after the catalytic converter on the passenger side). What was the diagnostic code before the sensors were replaced? Were aftermarket sensors used? This information is critical for diagnosing whether the issue stems from sensor quality or another system failure.

Anonymous 2020-10-18 21:34

The PCM has been replaced, and aftermarket oxygen sensors were installed. All wiring connections are confirmed as good. The mechanic now claims to be replacing the oxygen sensors with OEM parts and will return the original PCM—offering a refund but not covering the cost of the new PCM. The truck ran flawlessly for five weeks before the check engine light came on after an evap leak repair. Despite multiple attempts, the P0057 code remains persistent and cannot be cleared via standard OBD-II scanners.