AutoCodes – Generic – P1C56

P1C56 Code - NOX Sensor Intermittent Bank 1 Sensor 2

Quick Answer

The aftertreatment system is equipped with two Nox Sensors and modules. Common causes include Exhaust Leaks, Engine Misfire, Excessive Oil Consumption. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1C56 indicates NOX Sensor Intermittent Bank 1 Sensor 2.
Common causes: Common causes include Exhaust Leaks, Engine Misfire, Excessive Oil Consumption.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,171

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1C56 Description

The aftertreatment system is equipped with two Nox Sensors and modules. The upstream NOx Sensor 1/1 is located on the Turbocharger elbow downpipe and is permanently connected to a corresponding Nox Sensor Module mounted to the hot side of the engine block. The downstream NOx Sensor 1/2 is located at the outlet of the SCR Catalyst and is permanently connected to a corresponding Nox Sensor Module which is mounted on the right frame rail. The NOx Sensors and NOx Sensor Modules are calibrated to each other and must be replaced as an assembly. The two NOx Sensor and Module assemblies are not interchangeable. The NOx Sensor Modules are smart devices and communicate with the Powertrain Control Module (PCM) over the J1939 Data Link. The NOx Sensor Modules perform their own internal diagnostics and report malfunctions back to the PCM. The NOx Sensors are used to monitor the efficiency of the SCR Catalyst and dosing system. The PCM will illuminate the Malfunction Indicator Lamp (MIL) after the diagnostic runs and fails in two consecutive drive cycles. The PCM will turn off the MIL immediately after the monitor runs and passes.

OBDII Code P1C56 - NOX Sensor Intermittent Bank 1 Sensor 2 - AutoCodes.com — P1C56 Code - NOX Sensor Intermittent Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P1C56?

Exhaust Leaks
Engine Misfire
Excessive Oil Consumption
EGR System Leak
Faulty NOX Sensor Bank 1 Sensor 2
NOX Sensor Bank 1 Sensor 2 harness is open or shorted
NOX Sensor Bank 1 Sensor 2 circuit poor electrical connection

How to Fix the DTC P1C56?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1C56 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need Help with the Code?

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Information for Specific Makes

P1C56 Dodge — NOX Sensor Intermittent Bank 1 Sensor 2

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1C56 Code

1. What are the common symptoms of OBDII code P1C56 (NOX Sensor Intermittent Bank 1 Sensor 2)?

- Common symptoms include reduced engine performance, decreased fuel efficiency, rough idling, and illuminated Check Engine Light.

2. What could cause the OBDII code P1C56 to appear?

- The code P1C56 usually indicates a malfunction with the NOX (nitrogen oxide) sensor in Bank 1 Sensor 2, which is responsible for monitoring emissions.

3. How serious is the OBDII code P1C56?

- While the code may not cause immediate harm to your vehicle, it can lead to increased emissions and potential long-term damage to the engine if left unresolved.

4. What are some possible DIY repairs for OBDII code P1C56?

- DIY repairs may include checking the sensor's wiring for damages, cleaning the sensor, or replacing the NOX sensor in Bank 1 Sensor 2.

5. Can driving with the OBDII code P1C56 cause further damage to the vehicle?

- Continuously driving with this code may lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter over time.

6. How can I prevent OBDII code P1C56 from reoccurring?

- Regular maintenance, timely repairs, and addressing any underlying issues related to the NOX sensor can help prevent the code from reoccurring.

7. Is it safe to drive with the Check Engine Light on due to code P1C56?

- It is generally safe to drive with the Check Engine Light on for this code, but it is recommended to have the issue diagnosed and repaired as soon as possible.

8. How much does it typically cost to repair OBDII code P1C56 at a mechanic?

- Repair costs for this code can vary depending on the extent of the issue, but it may range from $200 to $500 including parts and labor.

9. Can a faulty NOX sensor in Bank 1 Sensor 2 impact the vehicle's emission levels?

- Yes, a malfunctioning NOX sensor can lead to increased emissions of harmful pollutants, which can contribute to environmental pollution.

10. How long does it usually take to repair OBDII code P1C56?

- The repair time for this code can vary depending on the exact cause and the availability of parts, but it typically takes a few hours to a day for a mechanic to diagnose and fix the issue.