AutoCodes – Generic – P1C55

P1C55 Code - NOX Sensor Intermittent Bank 1 Sensor 1

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
P1C55 indicates NOX Sensor Intermittent Bank 1 Sensor 1.
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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 6,299
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Mar 15, 2020
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Code P1C55 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 P1C55 - NOX Sensor Intermittent Bank 1 Sensor 1 - AutoCodes.com
P1C55 Code - NOX Sensor Intermittent Bank 1 Sensor 1

What are the Possible Causes of the DTC P1C55?

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

How to Fix the DTC P1C55?

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 P1C55 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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Information for Specific Makes

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 P1C55 Code

1. What are the common symptoms of OBDII code P1C55 NOX Sensor Intermittent Bank 1 Sensor 1?

- Common symptoms include reduced engine performance, increased fuel consumption, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P1C55 NOX Sensor Intermittent Bank 1 Sensor 1?

- Possible causes include a faulty NOX sensor, wiring issues, sensor connector problems, or an issue with the engine control module.

3. How can I diagnose the cause of OBDII code P1C55 NOX Sensor Intermittent Bank 1 Sensor 1?

- A thorough diagnostic scan using an OBDII scanner can help pinpoint the issue by providing specific trouble codes and live data related to the sensor's performance.

4. Is it safe to continue driving with OBDII code P1C55 NOX Sensor Intermittent Bank 1 Sensor 1?

- It is generally not recommended to continue driving with this code present, as it can lead to further damage to the vehicle and potentially worsen emissions levels.

5. How can I repair OBDII code P1C55 NOX Sensor Intermittent Bank 1 Sensor 1?

- Repair may involve replacing the NOX sensor, checking and repairing any wiring or connector issues, or resetting the engine control module.

6. Can a DIY enthusiast fix OBDII code P1C55 NOX Sensor Intermittent Bank 1 Sensor 1?

- While some basic troubleshooting like checking connections can be done by a DIYer, diagnosing and repairing the underlying issue may require professional assistance due to the complexity of the system.

7. Are there any maintenance tips to prevent OBDII code P1C55 NOX Sensor Intermittent Bank 1 Sensor 1 from recurring?

- Regular vehicle maintenance, including timely sensor inspections and addressing any warning lights promptly, can help prevent the recurrence of this code.

8. How do I reset the check engine light after repairing OBDII code P1C55 NOX Sensor Intermittent Bank 1 Sensor 1?

- The check engine light can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes and then reconnecting it.

9. Can a faulty NOX sensor affect vehicle emissions?

- Yes, a faulty NOX sensor can impact emissions by causing the vehicle to exceed emission standards, leading to environmental pollution.

10. Is OBDII code P1C55 NOX Sensor Intermittent Bank 1 Sensor 1 a common issue in certain vehicle makes and models?

- This code may be more common in vehicles equipped with NOX sensors, particularly in newer models that require more stringent emissions control.

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