P2214 code definition
The P2214 code occurs when the powertrain control module has detected that the nitric oxide and nitrogen dioxide gases (NOx) sensor circuit voltage reading is not in the anticipated levels for the engine bank (in this instance it is Perf Bank 2) it monitors.
What the P2214 code means
A P2214 code is an OBD-II generic code cued when the PCM cannot obtain the data it needs to calculate the typical NOx sensor circuit input data. This is the result of temperature and exhaust composition data received from oxygen sensors upstream and downstream from the PCM. The PCM uses the data to get the optimal NOx sensor readings for the catalytic converters. Because upstream readings will vary in accordance to changes in fuel mixture, if readings of upstream and downstream data are too close in terms of levels or times, it triggers this code.
What causes the P2214 code?
There are several causes for the P2214, including:
- Faulty catalytic converter
- Defective oxygen sensors (which also cues an oxygen sensor code and catalytic converter code)
- Some issues that cue the PCM to suspect a catalytic converter failure may cause the P2214 code too, including exhaust manifold leaks, as well as leaks from exhaust components, flex hoses and down pipes
What are the symptoms of the P2214 code?
Typically, the P2214 code is accompanied by minor symptoms that range from the service engine light and the storage of the code, but there are risks for engine stall or no start conditions. Should the catalytic converter have sustained damage, such as melted parts, the engine performance may decline, there may be hesitation or loud hissing sounds when accelerating.
How does a mechanic diagnose the P2214 code?
Usually, the P2214 is diagnosed with an OBD-II scanner. A mechanic will verify the code, look for additional codes (especially other oxygen sensor or catalytic converter codes) and then take the data and freeze frame data to determine when the code was set. They clear the codes and retest. If they return, the mechanic does a visual inspection of all of the wiring and connections, looking for corrosion, signs of shorts or loose connectors.
They then inspect the exhaust system for leaks and use a temperature gun to track conditions and compare with manufacturer recommendations. They will then test oxygen sensors and NOx sensors using voltage meters, narrowing the scanner's data fields to the specific sensors.
Common mistakes when diagnosing the P2214 code
The most frequent mistake made when diagnosing the P2214 code is to assume it is a catalytic converter issue. Often, other codes occur and cannot be ignored when diagnosing this code as it may lead to an unnecessary catalytic converter replacement. Oxygen sensor failure could be the cause, and this must be fully investigated before any components are replaced.
How serious is the P2214 code?
The P2214 code may lead to a no start or engine stall condition, making it a serious matter. If appearing with additional codes that have been held for extended periods, it can also cause catalytic converter damage or failure. Though there may be no drivability issues, it is not a code to overlook.
What repairs can fix the P2214 code?
Repairing the P2214 code may require:
- Repairing exhaust system leaks
- Inspecting and repairing all wiring and electrical connections or components as needed
- Replacing the catalytic converter
- Replacing the NOx sensor connector or the sensor itself
- Replacing the battery voltage feed circuit for the NOx sensor
- Testing and replacing related control modules (including PCM)
Additional comments for consideration regarding the P2214 code
The failure of control modules is a rarity and must be seen as the last possible issue when all other diagnostics fail to yield a solution to the recurring code. If modules are replaced, it typically means reprogramming is required. This is why it is best to start with oxygen sensor codes, then look at fuel trim, fuel mixture or misfire codes before working on the NOx sensor circuit issue.
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